Agilent Technologies J-BERT N4903B Servisní příručka Strana 1

SAgilent J-BERT N4903B High-Performance SerialBERTProgramming GuidesAgilent Technologies

Instrument BehaviorInstrument Behavior - ReferenceThe Serial BERT behaves as follows when it is turned on (or after a power-cycle):At power on, the Se

[SOURce[1]]:PATTern SubnodeThis subnode has the following SCPI structure:[:SOURce[1]:]PATTern:APCHange:EADDition[?]:RATE[?]:SOURce[?]:SELect[?]:FORMat

Table 14Name Description under:EADDition:SELect[?] “[SOURce[1]]:PATTern:EADDition:SELect[?] ” onpage 103:FORMat[:DATA][?] “[SOURce[1]]:PATTern:FORMat[

<EADD>: ONCE | 0 | 1 | OFF | ON0 | 1This command is a contraction of the phrase Error ADDition. It is used to controlthe addition of errors into

[SOURce[1]]:PATTern:EADDition:SOURce[?]IAgilentN490xPGErrorAddition.Mode (not IVI-compliant)[SOURce[1]]:PATTern:EADDition:SOURce EXTernal | FIXed[SOUR

<PACKed>: permits the packing of bits within a byte to be set.<NR1>: Can be 1, 4, or 8.1 | 4 | 8The command controls the format of data tr

[SOURce[1]]:PATTern[:SELect] <Source>[SOURce[1]]:PATTern[:SELect]?<Source>: PRBS<n> | PRBN<n> | ZSUBstitut<n> | MDENsity

N O T EIf the pattern generator and error detector are coupled, setting the pattern by usingthe SOURce1:PATTern:SELect command will cause the pattern

This command is only active when a ZSUB pattern has been selected (see“[SOURce[1]]:PATTern[:SELect][?] ” on page 104).The minimum value is the PRBN va

Table 17Name Description under:SOURce[?] “[SOURce[1]]:PATTern:APCHange:SOURce[?] ” onpage 110[SOURce[1]]:PATTern:APCHange:IBHalfIAgilentN490xPGAuxIn.B

The parameters have the following meanings:• ALTernateAlternate patterns are used. The pattern that is output must be defined with“[SOURce[1]]:PATTern

You can identify whether the error detector or pattern generator is overheating byrunning a self-test on both devices. To run a self-test:See also the

Only pattern B is output.• ABHalfPattern A and pattern B are sent alternatively (one instance A, one instance B,and so on).This command must be used t

N O T EThis command must be used together with the “[SOURce[1]]:PATTern:APCHange:MODE[?] ” on page 108 and “[SOURce[1]]:PATTern:APCHange:SELect[?] ” o

[SOURce[1]]:PATTern:SEQuence:DATA[?]IAgilentN490xPG2.Sequence.ExpressionSOURce[1]:PATTern:SEQuence:DATA <SequenceExpression>This command is used

Start=optionalBlock #=repeated for each block, numberedLoop=repeated for every loop, not numberedThe whole sequence expression must be surrounded by p

• AuxInHi | AuxInLo: Sequence starts when Auxiliary Input is high or low.• AuxInRising | AuxInFalling: Sequence starts with a rising or falling edge a

– None: Makes a block empty. Empty blocks may be present, but arecompletely ignored.– PRBS#: Pseudo random bit stream with the specified polynomial n

– LoopCount: The number of iterations of a counted loop (NR1).– INFinite: Specifies an endless loop. This is the default.– AuxInHi | AuxInLo: Loop con

[SOURce[1]]:PATTern:SEQuence:RCLIAgilentN490xPGSequence.Load()SOURce[1]:PATTern:SEQuence:RCL <FileIdentifier>This command recalls (loads) a sequ

SOURce[1]:PATTern:SEQuence:STATe?This query returns the number of the sequence block that is currently executed. Itcan be used to determine whether th

Table 21Name Description under:DATA[?] “[SOURce[1]]:PATTern:UFILe:DATA[?] ”on page 119:IDATA[?] “[SOURce[1]]:PATTern:UFILe:IDATa ”on page 121[:LENGth]

1 Programming Basics12 Agilent J-BERT N4903B High-Performance Serial BERT

Table 22Parameter Description[A|B] Defines for which pattern the data is tobe set (A = standard pattern, B =alternate pattern). If the pattern filedes

• For 4-bit packed data, the <block data> required to set the same pattern wouldbe:#1255• For 1-bit packed data, the <block data> would be

Table 24Parameter Description<block data> The data that describes the pattern (see“[SOURce[1]]:PATTern:UFILe:DATA[?] ”on page 119 for the descri

[SOURce[1]]:PATTern:UFILe:LABel[?]IAgilentN490xLocalPatternfile.Description (IVI-compliant)[SOURce[1]]:PATTern:UFILe:LABel <filename>, <strin

The default is set to have a length of 128 bits for each half pattern; all bits are setto zero and the trigger is set to occur on the A/B changeover.

N O T EFor the UPATtern<n> commands, <n> can be in the range 0 - 12. 0 (zero) is usedto select the current pattern, 1 - 12 selects one of

STR | APATThis command defines whether a user pattern file should be a straight pattern oran alternate pattern:• STRaightThe pattern is repeatedly out

Table 26Parameter Description<block data> The data that describes the pattern (seethe following for the description).The <block data> para

[SOURce[1]]:PATTern:UPATtern<n>:IDATa[?]IAgilentN490xPGPatternfile.SetDataBlock (IVI-compliant)[SOURce[1]]:PATTern:UPATtern<n>:IDATa [A |

• If the data packing is 4:SOURce1:PATTern:UPAT1:IDATa B, <filename>, 12, 4, #11F• If the data packing is 1:SOURce1:PATTern:UPAT1:IDATa B, <f

2 A Typical SerialBERT ProgramA Typical Serial BERT Program - ConceptsThe Serial BERT can be controlled by a remote program using the IVI-COM driver.T

Table 29Name Description under[:LEVel][:IMMediate]:HIGH[?] “[SOURce[1]]:VOLTage[:LEVel][:IMMediate]:HIGH[?] ” on page 131[:LEVel][:IMMediate]:LOW[?] “

The command sets the peak-to-peak value of the data signal in units of Volts. Thequery returns the peak-to-peak value of the data signal in units of V

[SOURce[1]]:VOLTage[:LEVel]:LLEVel <Family>[SOURce[1]]:VOLTage[:LEVel]:LLEVel?<Family>: ECL | LVPECL | SCFL | LVDS | CML | CUSTomECL | LVP

OUTPut[1] SubsystemOUTPut[1] Subsystem - ReferenceThe Output[1] subsystem represents the pattern generator's Data Out port.SCPI Command Reference

This subsystem has the following SCPI structure:OUTPut[1]:CENTral[?]:COUPling[?]:DATA:XOVer[?]:DCYCle[?]:DELay[?]:FORMat[?]:HOLD[?]:POLarity[?][:STATe

Table 30Name Description under:DCYCle[?] “OUTPut[1]:DCYCle[?]” on page 136:DELay[?] “OUTPut[1]:DELay[?]” on page 137:FORMat[?] “OUTPut[1]:FORMat[?]” o

The DISConnected command sets the voltage at the pattern generator's Data Out,Clock Out, Aux Data Out and Trigger/Ref Clock Out ports to 0 V, the

Sets the duty cycle of a repetitive pulse waveform (like in RZ or R1 signal modes).Duty cycle value <NR1> in % of the clock period. Valid range

OUTPut[1]:HOLD[?]IAgilentBertPGPulse.DelayHoldModeOUTPut[1]:HOLD <WIDTh | DCYCle>OUTPut[1]:HOLD?Determines whether Width or Duty Cycle shall be

This command is kept for compatibility reasons. Due to the lack of relays, it is notpossible to disable the Serial BERT's output. This command ha

• IVI-COM driver installed• Configured IO connection to the Serial BERT (you should be able to find theSerial BERT with the I/O libraries VISA assista

This command enables/disables the electrical idle feature of the Data Output. TheError Input can be used to provide an electrical idle (or out of band

Table 31Name Description under:DEEMphasis:IDN? “OUTPut[1]:DEEMphasis:IDN? ” on page142:DEEMphasis:UPDate[?] “OUTPut[1]:DEEMphasis:UPDate[?] ” onpage 1

OUTPut[1]:DEEMphasis:MODE DB | PERCentOUTPut[1]:DEEMphasis:MODE?This command is applicable for N4916A/B. The command toggles the unit of thede-emphasi

OUTPut[1]:DEEMphasis:UPDateOUTPut[1]:DEEMphasis:UPDate?This command is applicable for N4916A/B. This command is implemented toupdate the firmware of t

OUTPut[1]:DEEMphasis:OPTion?OUTPut[1]:DEEMphasis:OPTion?This query is applicable for N4916B. The query returns the option string of theconnected de-em

OUTPut[1]:MULTiplexer SubnodeThis subnode has the following SCPI structure:OUTPut[1]:MULTiplexer:ENABle[?]:IDN?:UPDate[?]:OPTion?:JITTer[?]:DEEMphasis

The commands included in this subnode are applicable for N4876A and M8061A.This subnode has the following commands:Table 32Name Description underComma

Table 32Name Description underOUTPut[1]:MULTiplexer:DEEMphasis:PRECursor(1-2)[?]“OUTPut[1]:MULTiplexer:DEEMphasis:PRECursor(1-2)[?]” on page 151OUTPut

Table 32Name Description underOUTPut[1]:MULTiplexer:VOLTage:LOW[?]“OUTPut[1]:MULTiplexer:VOLTage:LOW[?]” onpage 154OUTPut[1]:MULTiplexer:VOLTage:RANGe

This command is applicable for N4876A and M8061A. This command enables/disables the "Multiplexer with Deemphasis" function for M8061A or ena

True, True,"QueryInstrStatus=true")End SubPrivate Sub Form_Unload(Cancel As Integer)myBERT.CloseEnd SubWorking with the IVI-COM ObjectsWorki

This command is applicable for N4876A and M8061A. The command sets the f/2jitter at the DATA OUT port in the units of seconds.The query returns the pr

OUTPut[1]:MULTiplexer:DEEMphasis:SELect:PRESet[?]OUTPut[1]:MULTiplexer:DEEMphasis:SELect:PRESet < NRf >OUTPut[1]:MULTiplexer:DEEMphasis:SELect:P

This command is applicable for M8061A. The command sets the clock source toeither CLK or AUX.The query retunrs the present state.OUTPut[1]:MULTiplexer

OUTPut[1]:MULTiplexer:INTerference:DMODe?This command is applicable for M8061A. The command enables/disables thedifferential mode interference (DMI) f

OUTPut[1]:MULTiplexer:VOLTage:HIGH[?]OUTPut[1]:MULTiplexer:VOLTage:HIGH <NRf>OUTPut[1]:MULTiplexer:VOLTage:HIGH?This command is applicable for M

is selected, the amplitude range changes will be done automatically by changingthe amplitude value.The query returns the present state.OUTPut[1]:MULTi

This command is applicable for M8061A. The command sets the terminationvoltage of the electrical idle. The termination voltage parameter can only be c

OUTPut[1]:CLOCk SubnodeThis subnode has the following SCPI structure::CLOCk[:ENABle][?]:FREQuency:MULTiplier:TERMination?:COUPling[?][:VALue][?]:TRACk

OUTPut[1]:CLOCk[:ENABle][?]OUTPut[1]:CLOCk[:ENABle] 0 | 1 | OFF | ONOUTPut[1]:CLOCk[:ENABle]?This command is applicable for N4916B. The command enable

If the Track PG Clock Frequency check box is selected, then the firmware willcontrol both frequency as well as the multiplier value. In this case the

Set myED = .EDs.Item(EDName) Set myEDDataIn = myED.Input.DataIns.Item("EDDataIn1")End WithEnd SubChanging Instrument ParametersChang

OUTPut[1]:CLOCk:TERMination?This command is applicable for N4916B. The CLK-IN input is AC coupled and thusdoes not provide a threshold voltage, but it

This subsystem has the following SCPI structure:This subsystem has the following commands:Table 34Name Description under:FREQuency[:CW|:FIXed][?] “SOU

Table 34Name Description under:SSCLocking:DEViation:TYPE[?] “SOURce9:SSCLocking:DEViation:TYPE[?]” on page 163:SSCLocking:DEViation:PROFile[?] “SOURce

SOURce9:OUTPut[:STATe]?This command can be used to switch the pattern generator's clock generator inputfrom internal to external mode. It is prov

default deviation value. For more information on DOWNspread, UPSPread andCENTerspread deviations, refer J-BERT N4903B User's Guide.The Up-spread

SOURce9:SSCLocking:FREQuency[?]IAgilentN490xPGSpreadSpectrum.ModulationFrequencySOURce9:SSCLocking:FREQuency <NR3>SOURce9:SSCL:FREQ? MIN | MAXSe

This subsystem has the following SCPI structure:This subsystem has the following commands:Table 35Name Description under:FREQuency[:CW|FIXed]? “SOURce

Table 35Name Description under:VOLTage[:LEVEL][:IMMediate]:HIGH[?] “SOURce2:VOLTage[:LEVel][:IMMediate]:HIGH[?] ” on page 168:VOLTage[:LEVEL][:IMMedia

SOURce2:VOLTage:ECLSets the output AMPLitude and HIGH values to those used for the ECL family. Thereis no query form for this command. This command is

SOURce2:VOLTage[:LEVel][:IMMediate]:OFFSet[?]IAgilentN490xPGClockVoltage.VOffset (IVI-compliant)SOURce2:VOLTage[:LEVel][:IMMediate]:OFFSet <NR3>

myEDDataIn.Synchronisation.SyncNowEnd SubSetting Up a PatternThe following code shows you how to set up a pattern. It additionally shows asmall functi

SOURce2:VOLTage:PROT:RES?This command reset the protection circuit to normal operation at the Clock Outputchannel.SOURce2:VOLTage:PROTection[:STATe][?

OUTPut2 SubsystemOUTPut2 Subsystem - ReferenceThe OUTPut2 Subsystem represents the pattern generator's Clock Out port.This subsystem has the foll

OUTPut2:CENTerIAgilentN490xPGGlobal.OutputsDisconnect (not IVI-compliant)OUTPut2:CENTer DISConnect | CONNectThe DISConnect command sets the voltage at

OUTPut2:TERMination[?]IAgilentN490xPGClockVoltageVTerminationOUTPut2:TERMination 0 | -2 | 1.3OUTPut2:TERMination?This command sets the data terminatio

This subsystem has the following SCPI structure:This subsystem has the following commands:5 SCPI Command Reference174 Agilent J-BERT N4903B High-Perfo

Table 37Name Description under:TRIGger[:MODE][?] “SOURce3:TRIGger[:MODE][?] ” on page176:TRIGger:DCDRatio “SOURce3:TRIGger:DCDRatio ” on page177:TRIGg

Table 37Name Description under:TRIGger:VOLTage:LLEVel[?] “SOURce3:TRIGger:VOLTage:LLEVel[?]” on page 181:TRIGger:VOLTage:PROTection:RESet[?] “SOURce3:

In sequence trigger mode, a trigger pulse can be generated whenever a block isstarted or restarted.Whether that happens or not, depends on the block c

ABCH | SOPThis command defines when a trigger should be sent from the pattern generator'sTrigger/Ref Clock Out port:ABChange: The trigger is sent

be in the range: 7, 10, 11, 13, 15, 23. The parameter <NR1> must be in the range0 through pattern length - 1.The query returns the bit position

myPattern(ix - 1) = CByte("&H" & Mid(DataString, ix, 1)) Case AgilentBertEDPatternFormatRaw myPattern(

SOURce3:TRIGger:UPATtern<n>IAgilentN490xPGPosition.Bit (not IVI-compliant)SOURce3:TRIGger:UPATtern<n> <NR1>SOURce3:TRIGger:UPATtern&

SOURce3:TRIGger:VOLTage[:LEVel][:IMMediate]:LOW <NR3>SOURce3:TRIGger:VOLTage[:LEVel][:IMMediate]:LOW?The command sets the DC low output level of

SOURce3:VOLTage:PROTection:RESet[?]IAgilentN490xPGTrigVoltage.ProtectionReset (not IVI-compliant)SOURce3:VOLTage:PROTection:RESet[?]SOURce3:VOLTage:PR

SOURce3:TRIGger:OUTPut:TERMination <NR3>SOURce3:TRIGger:OUTPut:TERMination?This command sets the data termination level of the pattern generator

This subsystem has the following SCPI structure:SOURce5:DIVider[?]:BIT:OFFSet[?]:MODE[?]:VOLTage[:LEVel][:IMMediate][:AMPLitude][?]:HIGH[?]:LOW[?]:OFF

Table 38Name Description under:VOLTage[:LEVEL][:IMMediate]:HIGH[?] “SOURce5:VOLTage[:LEVel][:IMMediate]:HIGH[?] ” on page 187:VOLTage[:LEVEL][:IMMedia

SOURce5:MODE[?]SOURce5:MODE SUBRate | SCHannel | MULTiplexer | DEEMphasisSOURce5:MODE?This command sets the mode of Aux Data Output to either of the f

SOURce5:VOLTage[:LEVel][:IMMediate][:AMPLitude][?]IAgilentN490xPGAuxOutVoltage.VAmplitude (IVI-compliant)SOURce5:VOLTage [:LEVel][:IMMediate][:AMPLitu

SOURce5:VOLTage[:LEVel][:IMMediate]:OFFSet?The command sets the offset value of the pattern generator's Clock Out port inVolts. The query returns

SOURce5:VOLTage:PROTection[:STATe][?]IAgilentN490xPGAuxOutVoltage.ProtectionState (not IVI-compliant)SOURce5:VOLTage:PROTection[:STATe] ON | OFFSOURce

3 Recommended ProgrammingTechniquesRecommended Programming Techniques - ConceptsThis chapter provides some recommended techniques you should use whenp

Table 39Name Description under:COUPling[?] “OUTPut[5]:COUPling[?] ” on page 190:TERMination[?] “OUTPut[5]:TERMination[?] ” on page190:EIDLe[:STATe] “O

OUTPut[5]:EIDLe[:STATe]IAgilent:EIDLe[:STATe]OUTPut[5]::EIDLe[:STATe] 0 | 1 | ON | OFFOUTPut[5]::EIDLe[:STATe]?This command enables/disables the elect

The Serial BERT has a 10 MHz Reference Input at the rear.This subsystem has the following SCPI structure:This subsystem has the following commands:Tab

SENSe6:FREQuency[:CW|:FIXed]?IAgilentN490xPGClockIn.GetFrequency (IVI-compliant)SENSe6:FREQuency [:CW | :FIXed]?The query returns the frequency of the

This is the clock signal at the 10 MHz Ref In port. A frequency of 10 MHz isrequired.• EXTPLLSelects the clock signal at the CLK IN port. It is routed

An external clock signal applied to the External Input can be divided by a factorspecified by this SCPI command. This factor is only valid in the Exte

This subsystem has the following SCPI structure:This subsystem has the following commands and subnodes:Table 41Name Description underCommands:EXTernal

Table 41Name Description underGLOBal “SOURce8[:JITTer]:GLOBal[:STATE][?] ”on page 198Subnodes:CONFigure “SOURce8[:JITTer]:CONFigureSubnode” on page 19

SOURce8[:JITTer]:EXTernal:REMaining:LEVel?IAgilentN490xJExternal.GetMaxVoltageSOURce8[:JITTer]:EXTernal:REMaining:LEVel?This command returns the maxim

Table 42Name Description under:CONF:DELay[?] “SOURce8[:JITTer]:CONF:DELay[?] ” onpage 199SOURce8[:JITTer]:CONF[:TYPE][?]IAgilentN490xJitter.Distributi

© Agilent Technologies, Inc. 2014No part of this manual may be reproduced inany form or by any means (includingelectronic storage and retrieval or tra

• VHigh = VTerm + 1 V• VLow = VTerm + 0.9 VIf the port is correctly terminated while in this state, the output levels are returnedto the original leve

SOURce8:CONFigure:DELay <NR3>SOUR8:CONF:DEL?This parameter specifies a jitter delay between clock and data if the short delayline is active.SOUR

Table 43Name Description under:LEVel[?] “SOURce8[:JITTer]:RANDom:LEVel[?] ”on page 202:CFACtor?] “SOURce8[:JITTer]:RANDom:CFACtor?” on page 202SOURce8

SOUR8:RAND:FILT:SEL?Selcts between the 500MHz (LP500 default) low-pass filter and the 100MHz(LP100) low-pass filter.The query returns the present sett

Crest factor = peak-to-peak value / rms value.SOURce8[:JITTer]:BUNCorrelated SubnodeBounded uncorrelated jitter is generated from a pseudo random bina

Table 44Name Description under:PRBSequence[:SELect][?] “SOURce8[:JITTer]:BUNCorrelated:PRBSequence[?] ” on page 205:PRBSequence:DRATe[?] “SOURce8[:JIT

CEI11G: Meant for CEI 11 Gbit/s tests: PRBS data rate is 2 Gbit/s, the PRBSpolynomial is 211-1, the low-pass filter is 200 MHz.BGA: Preset values for

The query returns the present setting or the applicable min/max values.SOURce8[:JITTer]:BUNCorrelated:LEVel[?]IAgilentN490xJBoundedUncorrelated.Amplit

SOURce8[:JITTer]:PERiodic(*) SubnodeThe new JBert B hardware has two Periodic Jitter; Periodic Jitter (PJ1) andPeriodic Jitter (PJ 2), which are gener

Table 45Name Description under:LEVel[?] “SOURce8[:JITTer]:PERiodic(*):LEVel[?]” on page 210:PERiodic2:SWEep[:STATe][?] “SOURce8[:JITTer]:PERiodic2:SWE

SOURce8[:JITTer]:PERiodic(*)[:STATe][?]IAgilentN490xJPeriodic.EnableIAgilentN490xJSecondPeriodic.EnableSOURce8:PERiodic(*)[:STATE] ON | OFF | 1 | 0SOU

Controlling the Output LevelsControlling the Output Levels - ConceptsWhen the output levels are changed at the Serial BERT's data and clock outpu

The command selects the characteristics of the periodic jitter.The query returns the present setting (SIN | SQU | TRI).SOURce8[:JITTer]:PERiodic(*):LE

The query returns the present setting.SOURce8[:JITTer]:PERiodic2:SWEep:FREQuency:STOP[?]SOUR8[:JITT]:PER2:SWE:FREQ:STOP <NR3>SOUR8[:JITT]:PER2:S

The command defines whether the frequency steps are log equidistant(EQUidistant) along the periodic jitter curve or a frequency step matches a cornerf

SOURce8[:JITTer]:PERiodic2:SWEep:LEVel[:VALue][?]SOUR8[:JITT]:PER2:SWE:LEV[:VAL] CONS | VARSOUR8[:JITT]:PER2:SWE:LEV[VAL]?The command defines whether

SOUR8[:JITT]:PER2:SWE:STAN[:SEL]?The command defines the predefined number of standards that define a periodicsweep curve. These periodic jitter curve

Table 46Name Description under:LEVel[?] “SOURce8[:JITTer]:SINusoidal:LEVel[?]” on page 216:DISTribution[?] “SOURce8[:JITTer]:SINusoidal:DISTribution[?

SOURce8:SINusoidal:FREQuency <NR3>SOUR8:SIN:FREQ? MIN | MAXSets the frequency of the SINusoidal jitter in Hz.The query returns the present setti

SOURce8[:JITTer]:SPECtrally SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 47Name Description unde

:SOUR8:SPEC:LEV(*)?A suffix attached to the SCPI ..:LEVel(*) command is used to address two jitterlevels. The SCPI command ...:LEVel1 <NR3> chan

Table 48Name Description under[:STATe][?] “SOURce8[:JITTer]:RSSClocking[:STATe][?] ” on page 219:DISTribution[?] “SOURce8[:JITTer]:RSSClocking:DISTrib

This has the same effect.Allowing the Serial BERT to SettleAllowing Serial BERT to Settle - ConceptsWhen patterns are sent to the pattern generator or

SOURce8[:JITTer]:RSSClocking:FREQuency[?]IAgilentN490xJResidualSpreadSpectrum.FrequencySOURce8:RSSClocking:FREQuency <NR3>SOUR8:RSSC:FREQ? MIN |

This subsystem has the following commands:Table 49Name Description under:COUPling[?] “INPut[1]:COUPling[?] ” on page 221:DELay[?] “INPut[1]:DELay[?] ”

INPut[1]:DELay <NR3>INPut[1]:DELay?This command sets the delay of the active edge of the clock output relative to theerror detector's Data

INPut[1]:STATe[?]IAgilentN490xEDDataIn.Enabled (IVI-compliant)INPut[1]:STATe ON | OFF | 0 | 1Enables or disables normal data input.N O T EIt is not po

SENSe[1] SubsystemSENSe[1] Subsystem - ReferenceThe SENSe[1] subsystem represents the error detector's Data In port.5 SCPI Command Reference224 A

This subsystem has the following SCPI structure:This subsystem has the following subnodes and commands:Table 50Name Description underCommands:LOGGing[

Table 50Name Description under:SYNChronization[?] “SENSe[1]:SYNChronizat[?] ” on page228:SYNChronization:THReshold[?] “SENSe[1]:SYNChronization:THResh

Table 50Name Description under:PATTern “SENSe[1]:PATTern Subnode” on page248:VOLTage “SENSe[1]:VOLTage Subnode” on page264:SFError “SENSe[1]:SFError S

SENSe[1]:SYNChronizat[?]IAgilentN490xEDSynchronisation.AutoEnabled (IVI-compliant)SENSe[1]:SYNChronizat ONCE | 0 | 1 | OFF | ONSENSe[1]:SYNChronizat?T

SENSe[1]:FREQuency[:CW|:FIXed]? <Num> | <MIN | MAX>This command sets the clock frequency for clock data recovery. You can use anyof the fo

Dim myPG As AgilentN490x.Interop.IAgilentN490xPG2Set BERTStatus = myBERT.StatusSet myED = myBERT.EDs.Item("ED1")Set myPG = myBERT.PGs.Item(&

The following figure shows how the clock signal is directed to Aux Out in CLOCkmode:The following figure shows the circuit in DATA mode:SENSe[1]:ERMod

This command sets the error ratio mode for the error detector's Data In port.The query returns the present setting (BER | SER | PCI3BER | USB3BER

SENSe[1]:MRErrors:COUNt[:VALue][?]SENSe[1]:MRErrors:COUNt[:VALue] 1 | 0SENSe[1]:MRErrors:COUNt[:VALue]?This command sets the counter to count bit erro

SENSe[1]:BLOCk[?]IAgilentN490xEDErrorLocation.Mode (not IVI-compliant)SENSe[1]:BLOCk ON | OFF | 0 | 1 | BEADdress | WPATtern | BLOCkSENSe[1]:BLOCk?Thi

Sets the starting bit address of a bit address range for error location. The queryreturns the current value. This command only has an effect if the BL

Table 53Name Description under:ELOCation[?] “SENSe[1]:ELOCation[?]” on page 235:ELOCation:BEADdress “SENSe[1]:ELOCation:BEADdress[?]”on page 236:ELOCa

SENSe[1]:ELOCation:BEADdress[?]IAgilentN490xEDErrorLocation.BitAddress (not IVI-compliant)SENSe[1]:ELOCation:BEADdress <NR1>SENSe[1]:ELOCation:B

Status: Stopped; Last ELOC run was ended successfully: an errored bit wasfound in the bit stream and its bit position was calculated. The bit position

SENSe[1]:EYE SubnodeThis subnode has the following SCPI structure::MESSage?SENSe[1]:EYE:ACENter[?]:ALIGN:AUTO[?]:HEIGht?:QUICk:ALIGN:AUTO?:ACENter[?]:

Table 54Name Description under:QUICk:TCENter[?] “SENSe[1]:EYE:QUICk:TCENter[?] ” onpage 241:TCENter[?] “SENSe[1]:EYE:TCENter[?] ” on page242:THReshold

}while(question_reg() && QUESTION_REG_10);If Question_reg returns a value that includes bit 10 ("1024"), this is an indication thatt

SENSe[1]:EYE:ALIGN:AUTO[?]IAgilentN490xEDSampling.AutoAlign (IVI-compliant)SENSe[1]:EYE:ALIGN:AUTO ONCE | 1 | ONSENSe[1]:EYE:ALIGN:AUTO?This command i

This query returns any message generated by the last autoalign. The message maybe generated by autoalign, threshold center, or datadelay center functi

This command calls “SENSe[1]:EYE:TCENter[?] ” on page 242. It has nofunctionality of its own.SENSe[1]:EYE:TCENter[?]IAgilentN490xEDSamplingClockDataAl

SENSe[1]:EYE:THReshold[?]IAgilentN490xEDSynchronisation.Threshold (IVI-compliant)SENSe[1]:EYE:THReshold <NR3>SENSe[1]:EYE:THReshold?The command

Table 55Name Description under:BURSt[?] “SENSe[1]:GATE:BURSt[?] ” on page244:MANNer[?] “SENSe[1]:GATE:MANNer[?] ” on page244:MODE[?] “SENSe[1]:GATE:MO

SENSe[1]:GATE:MANNer <Manner>SENSe[1]:GATE:MANNer?TIME | ERR | BITSThis command sets the manner in which the accumulation period is controlled.&

SENSe[1]:GATE:PERiod:BITS[?]IAgilentN490xEDAccumulation.Bits (IVI-compliant)SENSe[1]:GATE:PERiod:BITS <NR3>SENSe[1]:GATE:PERiod:BITS?When GATE:M

The query returns the time to which the gate period is set.SENSe[1]:GATE[:STATe][?]IAgilentN490xEDAccumulation.GetStateIAgilentN490xEDAccumulation.Sta

SENSe[1]:PATTern SubnodeThis subnode has the following SCPI structure:This subnode has the following subnodes and commands:Table 56Name Description un

Table 56Name Description under:ZSUBstitut[:ZRUN][?] “SENSe[1]:PATTern:ZSUBstitut[:ZRUN][?]” on page 252Subnodes:UPATtern<n> “SENSe[1]:PATTern:UP

How the Serial BERT Uses Status RegistersYou can determine the state of certain instrument hardware and firmware eventsand conditions by programming t

SENSe[1]:PATTern:MDENsity[:DENSity][?]IAgilentN490xEDDataIn.MarkDensity (not IVI-compliant)SENSe[1]:PATTern:MDENsity[:DENSity] <NR2>SENSe[1]:PAT

ZSUBstitut: Zero SUBstitution; used for defining PRBN patterns in which a blockof bits is replaced by a block of zeros. The length of the block is def

SENSe[1]:PATTern:TRACk[?]IAgilentN490xEDDataIn.TrackingEnabled (not IVI-compliant)SENSe[1]:PATTern:TRACk 0 | 1 | OFF | ONSENSe[1]:PATTern:TRACk?This c

SENSe[1]:PATTern:ZSUBstitut[:ZRUN] MINimum | MAXimum | <NR3>SENSe[1]:PATTern:ZSUBstitut[:ZRUN]?<NR3>ZSUB patterns are PRBN patterns, where

Table 58Name Description under:DATA[?] “SENSe[1]:PATTern:UPATtern<n>:DATA[?] ” onpage 254:IDATa[?] “SENSe[1]:PATTern:UPATtern<n>:IDATa[?]

Table 59Parameter Description[A|B] Defines for which pattern the data is tobe set (A = standard pattern, B =alternate pattern). If the pattern filedes

• For 4-bit packed data, the <block data> required to set the same pattern wouldbe:#1255• For 1-bit packed data, the <block data> would be

Table 61Parameter Description<block data> The data that describes the pattern (see“SENSe[1]:PATTern:UPATtern<n>:DATA[?] ” onpage 254 for t

SENSe[1]:PATTern:UPATtern<n>:LABel[?]IAgilentN490xEDPatternfile.Description (IVI-compliant)SENSe[1]:PATTern:UPATtern<n>:LABel <string&g

SENSe[1]:PATTern:UFILe SubnodeThis subnode has the following SCPI structure:SENSe[1]:PATTern:UFILe[:LENGth][?]:LABel[?]:USE[?]:DATA[?]:IDATa[?]:NAME?T

The condition register continuously monitors the hardware and firmware statusof the instrument. There is no latching or buffering for a condition regi

SENSe[1]:PATTern:UFILe[:LENGth] <filename>, <NR1>SENSe[1]:PATTern:UFILe[:LENGth]? <filename>This command sets the length of a user p

The default is set to have a length of 128 bits for each half pattern; all bits are setto zero and the trigger is set to occur on the A/B changeover.S

<block data> starts with a header that indicates the length of the desired resultingdata. The length of the <block data> embedded in the h

This command is used to set specific bits in a user pattern. It is similar to the :DATAcommand. The :IDATa command is a contraction of the phrase Incr

SENSe[1]:PATTern:UFILe:NAMe[?]IAgilentN490xEDDataInGetSelectDataSENSe[1]:PATTern:UFILe:NAME?This query returns the file name of the currently used use

SENSe[1]:VOLTage:ZOTHreshold[?]IAgilentN490xEDSampling.ZeroOneThreshold (IVI-compliant)SENSe[1]:VOLTage:ZOTHreshold <NR3>SENSe[1]:VOLTage:ZOTHre

SENSe[1]:VOLTage:ZOTHreshold:AUTO[?]IAgilentN490xEDSampling.ZeroOneThresholdTrack (not IVI-compliant)SENSe[1]:VOLTage:ZOTHreshold:AUTO 0 | 1 | OFF | O

Table 67Name Description under:SFError:CBER:MODe[?] “SENSe[1]:SFError:CBER:MODe[?]” onpage 269:SFError:RESult[?] “SENSe[1]:SFError:RESult[?]” on page2

This command sets the conversion factor for the error detector's Data In port.Conversion factor is used to calculate the calculated Bit Error Rat

SENSe[1]:SFError:ASYMbol:MODe?For example;SENS1:SFE:ASYM:MOD REALThis command configures the settings that control the alignment of the incomingsymbol

Reading the Serial BERT's Status - ProceduresSee “Starting ELOC and Verifying that it is Running” on page 47 for an exampleof how to access the r

INPut2 SubsystemINPut2 Subsystem - ReferenceThe INPut2 Subsystem represents the error detector's Clock In port.This subsystem has the following S

This command is obsolete. It has no effect.SENSe2 SubsystemSENSe2 Subsystem - ReferenceThe SENSe2 Subsystem controls the error detector's Clock I

This subsystem has the following commands:Table 68Name Description under:FREQuency[:CW | FIXed]? “SENSe2:FREQuency[:CW|:FIXed]? ” onpage 273:FREQuency

Table 68Name Description under:FREQuency:CDR:AUTO[?] “SENSe2:FREQuency:CDR:THReshold:AUTO[?]” on page 278:FREQuency:CDR:THReshold[:VALue][?] “SENSe2:F

SENSe2:FREQuency:CDR?Enables or disables clock data recovery (CDR) mode.In CDR mode, the CDR has to recover the clock from the incoming data. To do th

SENSe2:FREQuency:CDR:PERR[?]NILSENSe2:FREQuency:CDR:PERR ON | OFF | 1 | 0SENSe2:FREQuency:CDR:PERR?Error out connector on the Analyzer’s front panel i

Sets/gets the peaking of the CDR, in dB. The allowed values depend on both theclock frequency of the CDR and its loop bandwidth, and can be queried wi

frequency value up to the deviation value set via the SCPI commandSENS2:FREQ:CDR:SSCL:DEV.SENSe2:FREQuency:CDR:SSCLocking:DEViation[?]SENSe2:FREQuency

SENSe2:FREQuency:CDR:TDENsity:MEASure?SENSe2:FREQuency:CDR:TDENsity:MEASure?Tries to measure the transition density of the incoming data, and returns

The command measures the DC level at the CDR input and sets the measured valueas CDR threshold.The query returns the current DC level at the CDR input

Status ByteThe Status Byte is the summary register to which the other registers report. Eachreporting register is assigned a bit in the Status Byte Re

This subsystem has the following SCPI structure:SOURce7:TRIGger[:MODE][?]DCDRatioCTDRatio?This subsystem has the following commands:SOURce7:TRIGger[:M

SOURce7:TRIGger:DCDRatio <NR1>Sets the trigger subratio.SOURce7:TRIGger:CTDRatio?IAgilentN490xEDTrigger.ClockDivisionRate (IVI-compliant)SOURce7

Table 69Name Description underCommandsSENSe2:BCOunt? “[P]FETCh:SENSe2:BCOunt? ” on page282SENSe2:FREQ[:CW|:FIXed]? “[P]FETCh:SENSe2:FREQuency[:CW|:FIX

[P]FETCh[:SENSe[1]] SubnodeThis subnode has the following SCPI structure:[P] FETCh[:SENSe[]1]:GATE:ELAPsed?:LOSS:POWer?:SYNChronizat?:SFCOunt?:EFSCoun

This subnode has the following commands and subnodes:Table 70Name Description underCommands:GATe:ELAPsed? “[P]FETCh[:SENSe[1]]:GATE:ELAPsed?” on page

Table 70Name Description under:EINTerval “[P]FETCh[:SENSe[1]]:EINTervalSubnode” on page 294:G821 “[P]FETCh[:SENSe[1]]:G821 Subnode”on page 296:ERATio

Table 70Name Description under:DRRatio “[P]FETCh[:SENSe[1]]:DRRatioSubnode” on page 311[P]FETCh[:SENSe[1]]:GATE:ELAPsed?IAgilentN490xEDAccumulation.Fe

[P]FETCh[:SENSe[1]]:SFCOunt?IAgilentN490xEDSymbolFrameCount.Read (IVI-compliant)[P]FETCh[:SENSe[1]]:SFCOunt?This query returns accumulated symbol coun

[P]FETCh[:SENSe[1]]:ESCount?[P]FETCh[:SENSe[1]]:ESCount?This query is contraction of Expected SKPOS Count. It returns total number ofExpected SKPOS Co

Table 71Name Description under:TCOunt? “[P]FETCh[:SENSe[1]]:BURSt:TCOunt? ”on page 290:STATe? “[P]FETCh[:SENSe[1]]:BURSt:STATe?”on page 290[P]FETCh[:S

• *STB?If the register is read using the common command *STB? , bit 6 is referred toas the master summary bit or MSS bit. This bit indicates that the

[P]FETCh[:SENSe[1]]:BURSt:TCOunt?IAgilentN490xEDBurst.ReadTotalCount (not IVI-compliant)[P]FETCh[:SENSe[1]]:BURSt:TCOunt?This query returns the Total

In this case, it is recommended that you redefine the pattern. This error canonly occur with memory-based patterns.•BURST_RESULT_STATE__UNKNOWNThe sta

[P]FETCh[:SENSe[1]]:ECOunt[:ALL][:FULL][:TOTal]?IAgilentN490xEDErrorCount.Read (IVI-compliant)[P]FETCh[:SENSe[1]]:ECOunt[:ALL][:FULL][:TOTal]?This que

[P]FETCh[:SENSe[1]]:EFINterval SubnodeThis subnode has the following SCPI structure:[P]FETCh[:SENSe[1]]:EFINterval:SEConds?:DSEConds?:CSEConds?:MSECon

[P]FETCh[:SENSe[1]]:EFINterval:DSEConds?IAgilentN490xEDIntervals.ReadErrorFreeDeciSeconds (not IVI-compliant)[P]FETCh[:SENSe[1]]:EFINterval:DSEConds?T

This subnode has the following commands:Table 74Name Description under:SEConds? “[P]FETCh[:SENSe[1]]:EINTerval:SEConds? ” on page 295:DSEConds? “[P]FE

[P]FETCh[:SENSe[1]]:EINTerval:CSEConds?IAgilentN490xEDIntervals.ReadErroredCentiSeconds (not IVI-compliant)[P]FETCh[:SENSe[1]]:EINTerval:CSEConds?This

Table 75Name Description under:UNAVailability? “[P]FETCh[:SENSe[1]]:G821:UNAVailability? ” on page297:SESeconds? “[P]FETCh[:SENSe[1]]:G821:SESeconds?

[P]FETCh[:SENSe[1]]:G821:SESeconds?IAgilentN490xEDG821ReadPercentSeverelyErroredSeconds[P]FETCh[:SENSe[1]]:G821:SESeconds?Returns the G.821 severely e

Table 76Name Description under[:ALL][:FULL][:TOTal][?] “[P]FETCh[:SENSe[1]]:ERATio[:ALL][:FULL][:TOTal]? ” on page 299[:ALL][:FULL]:DELTa[?] “[P]FETCh

Contents1 Programming BasicsProgramming Basics - Concepts 7Before You Begin 8Before You Begin - Concepts 8Instrument Behavior 10Instrument Behavior -

Table 2Bit Mnemonic Description4 EXE Execution error bit. It is setwhen a command (GPIBinstrument specific)cannot be executed due toan out of range pa

[P]FETCh[:SENSe[1]]:ERATio:OASZero[:TOTal]?This is a contraction of the phrase One received AS Zero. The query returns theratio of erred ones (a true

This query is a contraction of the phrase Symbol Frame Error Count. It returns totalnumber of error symbols received in a time interval.[P]FETCh[:SENS

[P]FETCh[:SENSe[1]]:FECount[:ALL][:FULL]:DELTa?[P]FETCh[:SENSe[1]]:FECount[:ALL][:FULL]:DELTa?This query returns the "instantaneous" number

This query returns the "instantaneous" symbol error ratio (Actual SER) calculatedfrom the counts obtained in the last deci-second. This valu

[P]FETCh[:SENSe[1]]:IDCCount SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 81Name Description und

[P]FETCh[:SENSe[1]]:DERatio SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 82Name Description unde

[P]FETCh[:SENSe[1]]:ISCount SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 83Name Description unde

[P]FETCh[:SENSe[1]]:ISRatio SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 84Name Description unde

[P]FETCh[:SENSe[1]]:FSCount SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 85Name Description unde

In the "Bit Comparison without PCIe3 SKPOS" error ratio mode, this query returnsthe “instantaneous” number of SKPOS bits, calculated from th

Table 3Bit Mnemonic Description0 ERR DET Clock loss condition at theerror detector.1 PAT GEN Clock loss condition at thepattern generator.2-15 Not use

[P]FETCh[:SENSe[1]]:FSRatio SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 87Name Description unde

In the "Bit Comparison without PCIe3 SKPOS" error ratio mode, this query returnsthe "instantaneous" SKPOS Bit Ratio, calculated fr

This query returns the "instantaneous" number of data rate ratio (Actual DRR),calculated from the counts obtained in the last deci-second. T

This subsystem has the following SCPI structure::PLUGin[:J20]:ISINterference[:SELect]::SINTerference:FREQency[?]:Global[:STATe][:STATe][?]:VOLTage[?]:

PLUGin[:J20]:GLOBal[:STATE][?]IAgilentN490xJInterferenceEnablePLUGin[:J20]:GLOBal[:STATE] ON | OFF | 1 | 0PLUGin:GLOB?Enables or disables the plug-in

PLUGin[:J20]:SINTerference:FREQuency <NR3>PLUGin[:J20]:SINT:FREQ? MIN | MAXSets the frequency of the sinusoidal interference in Hz.The query ret

STATus SubsystemSTATus Subsystem - ReferenceThe STATus Subsystem provides an interface to the instrument's Status Register.For information on how

Table 90Name Description underSTATus:PROTection “STATus:PROTection Subnode” on page325STATus:SYMBol “STATus:SYMBol Subnode” on page327STATus:PRESetIAg

CLOSs SubnodeThis subnode refers to the clock loss status register. It has the following SCPIstructure:STATus:CLOSs:CONDition?:ENABle[?][:EVENt]?:NTRa

STATus:CLOSs:ENABle[?]IAgilentN490xStatus.Register (not IVI-compliant)STATus:CLOSs:ENABle <NR1>STATus:CLOSs:ENABle?The command sets the enable m

Table 5Bit Mnemonic Description0 DATA LOSS This bit is set when thedata source is turned off,not connected, or thecables or device is faulty.This bit

STATus:CLOSs:PTRansition[?]IAgilentN490xStatus.Register (not IVI-compliant)STATus:CLOSs:PTRansition <NR1>STATus:CLOSs:PTRansition?This command s

Table 92Name Description under:PTRansition[?] “STATus:OPERation:PTRansition[?] ” onpage 322STATus:OPERation:CONDition?IAgilentN490xStatus.Register (no

Note that reading the event register clears it.STATus:OPERation:NTRansition[?]IAgilentN490xStatus.Register (not IVI-compliant)STATus:OPERation:NTRansi

STATus:QUEStionable SubnodeThis subnode has the following SCPI structure:STATus:QUEStionable:CONDition?:ENABle[?][:EVENt]?:NTRansition[?]:PTRansition[

STATus:QUEStionable:ENABle[?]IAgilentN490xStatus.Register (not IVI-compliant)STATus:QUEStionable:ENABleSTATus:QUEStionable:ENABle?The command form set

STATus:QUEStionable:PTRansition[?]IAgilentN490xStatus.Register (not IVI-compliant)STATus:QUEStionable:PTRansitionSTATus:QUEStionable:PTRansition?This

Table 94Name Description under[:EVENt]? “STATus:PROTection[:EVENt]? ” onpage 326:NTRansition[?] “STATus:PROTection:NTRansition[?] ”on page 327:PTRansi

AgilentN490xStatusRegisterEnum.AgilentN490xStatusRegisterProtectionSTATus:PROTection[:EVENt]?The EVENt register guarantees that the application cannot

This subnode has the following commands:Table 95Name Description under:CONDition? “STATus:SYMBol:CONDition? ” on page328:ENABle[?] “STATus:SYMBol:ENAB

The command sets the enable mask in the Symbol Mode Register, which allowstrue conditions in the event register to be reported in the summary bit. The

Table 5Bit Mnemonic Description8 UNCAL This bit is set when theserial number of theinstalled pattern generatoror error detector does notmatch the cali

SYSTem SubsystemSYSTem Subsystem - ReferenceThe SYSTem subsystem represents general system functions.The subsystem has the following SCPI structure:S

Table 96Name Description under:BEEPer:STATe “SYSTem:BEEPer:STATe[?] ” on page332:BEEPer:THReshold[?] “SYSTem:BEEPer:THReshold[?] ” onpage 333:BEEPer:V

Table 96Name Description under:INSTrument:External:VISA:RESources[:ALIases]?“SYSTem:INSTrument:External:VISA:RESources[:ALIases]?” on page 338The LICe

SYSTem:BEEPer:THReshold[?]IAgilentN490xAudio.Threshold (not IVI-compliant)SYSTem:BEEPer:THReshold <NR1>SYSTem:BEEPer:THREshold?The command sets

SYSTem:GPIB?Sets or returns the instrument's GPIB address.SYSTem:HELP:HEADers?SYSTem:HELP:HEADers?This query returns the complete list of instrum

SYSTem:LICense:HOST?Licensed options are bound to a certain host. This query returns the host ID as aquoted string, either MAC address or CPU ID.SYSTe

The command opens the license file, reads its contents, and installs (stores) thelicense.IAgilentN490xLicenseInstallKeySYSTem:LICense:INSTall:CODE <

N O T EIf more boxes are connected the returned string will be expanded by another set ofthree items. The following string “,,” will be returned if no

SYSTem:INSTrument:External:VISA:RESources[:ALIases]?SYSTem:INSTrument:External:VISA:RESources[:ALIases]? “Product Name of theBox”This query returns th

The subsystem has the following SCPI structure:This subsystem has the following commands and subnodes:Table 97Name Description underCommands:SYSTem:ER

Table 6Bit Mnemonic Description3 OVERHEAT The pattern generator orerror detector has ahigher-than-normaltemperature.4 GATE ON An accumulatedmeasuremen

MEAS:SYSTem:ERRor?IAgilentN490xEDDataIn.GetMeasurementError()MEASure:SYSTem:ERR?This query pulls the next error from the error queue. It returns the e

Table 98Name Description under:PASSed? “MEAS:GENeric(*):PASSed?” on page342:STATe? “MEAS:GENeric(*):STATe?” on page342:TERMinal:DATA:AVAilable? “MEAS:

MEAS:GENeric(*):OPC?IAgilentN490xEDFastEye.GetRunState()MEAS:GENeric(*):OPC? [BLOCk | NBLock]This query returns 1 when all pending measurement operati

Returns the measurement state:• PROGram: Measurement not yet started, parameters can be changed.• RUNNing: Measurement running, no parameters can be c

Table 99Name Description under:PROGress? “MEAS:ADJustment(*):PROGress?” onpage 344MEAS:ADJustment(*):CREate?MEAS:ADJustment(*):CREate?This query retur

MEASure:FEMask(*) SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 100Name Description under:CREate?

Table 100Name Description under:PARameter:MERR:MODE[?] “MEAS:FEMask(*):PARameter:MERRor:MODE[?]” onpage 348:PARameter:PFCRiteria[:VALue][?] “MEAS:FEMa

Creates a Fast Eye Mask measurement object. The return value is the handle usedto identify this object by any calls to this object. If, for example, 2

The query returns the setting, not the number of bits actually measured.MEAS:FEMask(*):PARameter:MERRor:MODE[?]IAgilentN490xEDFastEye.CheckComparedErr

MEAS:FEMask(*):PARameter:THReshold[:INPut]:TYPE ABSolute | PCT | OFFSetMEAS:FEMask(*):PARameter:THReshold[:INPut]:TYPE?Determines how the threshold fo

N O T EDepending on the options of your Serial BERT, some of the status bits may not bevalid for your instrument. See the User Guide for a descriptio

MEAS:FEMask(*):PARameter:POINt:NUMBerMEAS:FEMask(*):PARameter:POINt:NUMBer?Specifies/returns the number of data points to be measured. The maximum num

Returns a comma-separated list of measured values for nItems data points. If fewerpoints are available, only the values for available points are retur

MEASure:JTOL:CHAR(*) SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 101Name Description under:CREa

Table 101Name Description under:PARameter:FLISt[?] “MEAS:JTOL:CHAR(*):PARameter:FLISt[?]” on page 355:PARameter:FLISt:FILL “MEAS:JTOL:CHAR(*):PARamete

Table 101Name Description under:PARameter:SEARch:ULOG:RATIo[?] “MEAS:JTOL:CHAR(*):PAR:SEARch:ULOG:RATIo[?]” onpage 359:PARameter:SEARch:DLOG:STOP[?] “

Table 101Name Description under:FETC:DATA:POINts? “MEAS:JTOL:CHAR(*):FETC:DATA:POINts?” on page 363:FETC:DATA:CAPability? “MEAS:JTOL:CHAR(*):FETC:DATA

MEAS:JTOL:CHAR(*):PARameter:FLISt:FILLIAgilentN490xJCharacterizationMeasurement.GenerateFrequencyList()MEAS:JTOLerance:CHAR(*):PARameter:FLISt:FILL &l

MEAS:JTOL:CHAR(*):PARameter:BTESt:CLEVel[?]IAgilentN490xJCharacterizationMeasurement.TargetBERConfidenceMEAS:JTOLerance:CHAR(*):PARameter:BTESt:CLEVel

The query returns the present number.MEAS:JTOL:CHAR(*):PARameter:SEARch[?]IAgilentN490xJCharacterizationMeasurement.SearchAlgorithmMEAS:JTOLerance:CHA

MEAS:JTOL:CHAR(*):PAR:SEARch:DLIN:STEP?The command sets the jitter amplitude step size for a downwards linear search.The unit is UI.The query returns

Setting Up Data PointsWhen you create a measurement object, the object is set up by default with sixsymmetrically placed data points, as shown in the

MEAS:JTOLerance:CHAR(*):PARameter:SEARch:DLOG:STOP <NR3>MEAS:JTOL:CHAR(*):PAR:SEARch:DLOG:STOP?The command sets the jitter amplitude stop value

MEAS:JTOL:CHAR(*):PAR:SEARch:EBIN:ACC:COARse[?]IAgilentN490xJCharacterizationMeasurement.SetSearchParameter/GetSearchParameterMEAS:JTOLerance:CHAR(*):

This command uses two parameters. The first parameter sets the minimum ormaximum jitter curve type. The second parameter enables or disables the jitte

The command sets the DUT relax time. This is the time that takes effect after themeasured BER is higher than the target BER. The next BER measurement

• the number of errors detected (NR3)• Passed/failed flag (NR1); 0 = failed, 1 = passedMEAS:JTOL:CHAR(*):FETC:DATA:CAPability?IAgilentN490xJCharacteri

MEASure:JTOL:COMP(*) SubnodeThis subnode has the following SCPI structure:This subnode has the following commands:Table 102Name Description under:CREa

Table 102Name Description under:PARameter:FLISt:STANdard “MEAS:JTOL:COMP(*):PARameter:FLISt:STANdard” onpage 368:PARameter:BTESt[?] “MEAS:JTOL:COMP(*)

Table 102Name Description under:PARameter:STANdard:PLOT? “MEAS:JTOL:COMP(*):PAR:STANdard:PLOT?” on page 372:PARameter:STANdard:DESCription[?] “MEAS:JT

MEAS:JTOL:COMP(*):PARameter:FLISt[?]IAgilentN490xJComplianceMeasurement.GetFrequencyListIAgilentN490xJComplianceMeasurement.SetFrequencyListMEAS:JTOLe

The individual frequencies are returned by the MEAS:JTOL:COMP(*):PAR:FLIS?query.MEAS:JTOL:COMP(*):PARameter:BTESt[?]IAgilentN490xJComplianceMeasuremen

2Note that the returned number (handle) has to be used as a suffix in each ofthe subsequent SCPI commands to address the measurement.2Define how many

MEAS:JTOL:COMP(*):PARameter:BTESt:NBITs[?]IAgilentN490xJComplianceMeasurement.NumberOfBitsMEAS:JTOLerance:COMP(*):PARameter:BTESt:NBITs <NR3>MEA

MEAS:JTOL:COMP(*):PAR:STANdard:NAMes? query lists <standard enum>,<name> pairs, where <name> is the standard's name.The query r

This query returns the highest frequency of the frequency range of the selectedstandard.MEAS:JTOL:COMP(*):PAR:STANdard:NAMes?IAgilentN490xJComplianceM

MEAS:JTOL:COMP(*):PAR:STANdard:DESCription[?]MEAS:JTOL:COMP(*):PAR:STANdard:DESCription USER, <string>MEAS:JTOL:COMP(*):PAR:STANdard:DESCription

MEAS:JTOL:COMP(*):FETC:DATA:AVAilable?IAgilentN490xJComplianceMeasurement.GetDataCount()MEAS:JTOLerance:COMP(*):FETC:DATA:AVAilable?This query returns

MEAS:JTOLerance:COMP(*):FETC:DATA:CAPability?This query returns a comma-separated list that contains the maximum jitteramplitude the Serial BERT could

MEASure:EMASk(*) SubnodeThis subnode has the following SCPI structure:5 SCPI Command Reference376 Agilent J-BERT N4903B High-Performance Serial BERT

SCPI Command Reference 5Agilent J-BERT N4903B High-Performance Serial BERT 377

This sub node has the following commands:Table 103SCPI Name Description Under:CREate? “:MEASure:EMASk:CREate?” on page382:CLEAr “:MEASure:EMASk(*):CLE

Table 103SCPI Name Description Under:FETCh:CONTour? “:MEASure:EMASk(*):FETC:CONTour?”on page 391:MARKer? “:MEASure:EMASk(*):MARKer?” onpage 385:MASK:L

0...meas:fem2:poin:pass? 60In our example, points 1 and 6 failed, the other points passed.4Specify how the timing resolution is to be reported:meas:fe

Table 103SCPI Name Description Under:MASK:MARGin:RESult? “:MEASure:EMASk(*):MASK:FETCh:RESult?” on page 390:MASK:FETCh:BERS? “:MEASure:EMASk(*):MASK:F

Table 103SCPI Name Description Under:FETCh:RESult:JRMSquare? “:MEASure:EMASk(*):FETCh:RESult:JRMSquare?” on page395:FETCh:RESult:CVOLtage? “:MEASure:E

Table 103SCPI Name Description Under:PARameter:PERSistence “:MEASure:EMASk(*):PARameter:PERsistence” on page399:PARameter:MARea “:MEASure:EMASk(*):PAR

Integer number representing the measurement handle.Example:meas:emas:cre?2:MEASure:EMASk(*):FETCh:DATA?:MEASure:EMASk(*):FETCh:DATA?Gets the measureme

+000,0.000000000000e+000,0.000000000000e+000,0.000000000000e+000…andso on:MEASure:EMASk(*):CLEAr:MEASure:EMASk(*):CLEArThis command clears the eye dis

:MEASure:EMASk(*):MARKer?:MEASure:EMASk(*):MARKer?Returns the threshold delay and the BER at the left and right intersections of themarker lines.x coo

margins. If the margins are not defined in the input file, then the output isNOMARGIN, and the margin SCPIs are ineffective.Example:MARGIN,DISP,8.0E-1

An output result withing the range of -100 to 100.:MEASure:EMASk(*):MASK:MARGin:REGion?:MEASure:EMASk(*):MASK:MARGin:REGion?Fetches the coordinates of

• y value:MEASure:EMASk(*):MASK:ALIGn:MEASure:EMASk(*):MASK:ALIGn:MEASure:EMASk(*):MASK:ALIGn?Sets the mask alignment to either the eye boundaries, or

This stretches/shrinks, or moves the mask around. When levels (0 and 1) change,the relative coordinates move accordingly. Tracking indicates constant

Running the Eye Diagram - ProceduresThe following code indicates how you could set up and run the Eye Mask usingSCPI.N O T EThe Eye Diagram measuremen

N O T EThe above values will be returned for each mask region.NoneCoordinates of the Mask Region.:MEASure:EMASk(*):MASK:FETCh:RESult?:MEASure:EMASk(*)

• The worst BER (The greatest BER in that region).N O T EThe above values will be returned for each mask region.NoneNumber of BER violations:MEASure:E

167,205,177,205,1 87,205,263,156,263,146,263,136,ResultsThe following SCPIs are all Queries::MEASure:EMASk(*):FETCh:RESult:SCOunt?:MEASure:EMASk(*):FE

Returns the measurement of the mean value of the logical 1 in the eye diagram.This is directly affected by the values set for Eye Boundaries. See“:MEA

NoneEye Amplitude:MEASure:EMASk(*):FETCh:RESult:HEIght?:MEASure:EMASk(*):FETCh:RESult:HEIght?Eye height is a measurement of the vertical opening of an

Jitter P-P:MEASure:EMASk(*):FETCh:RESult:JRMSquare?:MEASure:EMASk(*):FETCh:RESult:JRMSquare?Jitter Root-Mean Square is the standard deviation of the n

:MEASure:EMASk(*):FETCh:RESult:AVGPower?:MEASure:EMASk(*):FETCh:RESult:AVGPower?1-level and 0-level are convereted into power values using Conversion

:MEASure:EMASk(*):FETCh:RESult:DCDistortion?:MEASure:EMASk(*):FETCh:RESult:DCDistortion?This value is the difference between the period of a 1 bit and

EXTR, 9.910000000000e+037,OMA,9.910000000000e+037,AVGP,9.910000000000e+037ParametersThe following SCPIs are both Commands and Queries, the input param

:MEASure:EMASk(*):PARameter:WIDth:CUStom:MEASure:EMASk(*):PARameter:WIDth:CUStom:MEASure:EMASk(*):PARameter:WIDth:CUStom?Input parameter for the eye w

Allowing the Serial BERT to Settle 22Allowing Serial BERT to Settle - Concepts 22Allowing Serial BERT to Settle - Procedures 22Reading the Serial BERT

Setting Up Data PointsThe Jitter Tolerance Characterization test generates jitter with varying amplitudes.The condition for proceeding from one amplit

:MEASure:EMASk(*):PARameter:MARea:MEASure:EMASk(*):PARameter:MARea:MEASure:EMASk(*):PARameter:MARea?Defines the eye window boundaries used for calcula

:MEASure:EMASk(*):PARameter:BERThresh:MEASure:EMASk(*):PARameter:BERThresh ZERo|THReshold:MEASure:EMASk(*):PARameter:BERThresh?The measurement results

:MEASure:EMASk(*):PARameter:DLEVel:MEASure:EMASk(*):PARameter:DLEVel:MEASure:EMASk(*):PARameter:DLEVel?Dark LevelDark Level Optical parameter.Returns

TEST:EXECute?IIviDriverUtility.SelfTest (IVI-compliant)TEST:EXECute? [SelfTest_value] {,<SelfTest_value>}This command runs user-specified self t

• EDPOn: Error Detector Power On messages• PGEN: Pattern Generator selftest messages• EDET: Error Detector selftest messages• PGCal: Pattern Generator

Index[P]FETCh[PFETCh], 281AAdvanced Analysis Subsystem, 338Aux Out, 224BBit Recovery Mode, 251BRM, 251CClock InError Detector (INPut2), 270Error

OUTPut[1], 133OUTPut[5], 189PPattern GeneratorClock In port, 191Clock Out (volt) commands, 171Clock Out commands (SOURce2),165Clock Out commands (

Prepare the MeasurementTo create the measurement object and prepare the measurement:1Create the session:meas:jtol:char:cre?7Note that the returned num

1.0E+0Evaluate the ResultsTo evaluate the results:1Get the number of points measured:meas:jtol:char7:fetc:data:ava?542Ask for the DUT capability:meas:

Restrictions for Error Location CaptureError Location Capture is subject to the following restrictions:• Only memory-based patterns with a unique 48-b

The Operation Status register should catch negative transitions on the ERR LOCCAPTURE bit (bit 14).2Check the status registers to see if Error Locatio

To query the status of the Error Location Capture measurement:• Use the following commands:– IVI-COM: IAgilentN490xEDErrorLocation.ReadState– SCPI: SE

How to Handle Run ErrorsErrors in Error Location Capture are handled differently than standard instrumenterrors:• Errors caused by starting or stoppin

Private myStatusByte As IntegerPrivate myOperReg As LongSub Start_And_Verify_ELOC()Set myED = myBert.EDs.Item("ED1")Set myEDDataIn = myED.In

AgilentN490xStatusRegisterOperation, _ AgilentN490xStatusSubRegisterEnum. AgilentN490xStatusSubRegisterEvent) If (myOperReg And &

If myELOC.ReadState = AgilentN490xEDErrorLocationStateEnum. AgilentN490xEDErrorLocationStateAborted Then ' Any code for verifying t

5 SCPI Command ReferenceSerial BERT Subsystems 89IEEE Commands 91IEEE Commands – Reference 91SOURce[1] Subsystem 98SOURce[1] Subsystem - Reference 98O

If myELOC.ReadState = AgilentN490xEDErrorLocationStateEnum. AgilentN490xEDErrorLocationStateSuccess Then ' Read the results myELOC_Count

Alternatively, you can set up a loop and wait until the OPER bit (bit7) of thestatus byte is set (*STB?). Then check the Operation status register(STA

To calculate the captured pattern, XOR the bits from pattern A with the bits frompattern B. See also “Handling the Results” on page 45 for more inform

• Locate the corresponding status register.• Set the transition filter to pass the chosen transition of that event.• Set the enable register from that

5Set the enable mask in the Operation Status register on bit 8:STATus:OPERation:ENABle 256With this setting, any bit error (bit 8: BIT ERR) is reporte

Working With User PatternsWorking With User Patterns - ConceptsThe following topics provide information on the recommended techniques forworking with

The source defines how the Serial BERT determines what should be output. Thefollowing alternatives are available:• InternalAlternate pattern output is

• AB HalfPattern A and pattern B are sent alternatively (one instance A, one instance B,and so on).The following table shows how these commands work t

Table 7Source Mode DescriptionBlanking Alternate The signal at Aux Incontrols whether output isgenerated:If Aux In=logic high,output is generated.If A

Alternate patterns are composed of two halves. The half that is sent out can bedefined according to input at the Aux In port, triggered by the instrum

PLUGin Subsystem 312PLUGin Subsystem - Reference 312STATus Subsystem 316STATus Subsystem - Reference 316SYSTem Subsystem 330SYSTem Subsystem - Referen

User alternate pattern;Trigger is set withSOUR3:TRIG:APAT<n> ABCH | SOPAPATSOUR3:TRIG:MODEPATTDCLSOUR1:PATT:SELTrigger sent according totrigger

Working with User Patterns in IVI-COMThe following code provides an example of how to set up an alternate pattern.Private Sub DefinePatternFile()&apos

' Now send the pattern to the instrument .SelectDataEnd With' And finally send a trigger upon pattern changemyPGTrig.Mode = AgilentN4

Dim myED As IAgilentN490xEDDim myPattern() As StringDim ix As IntegerSet myPG = myBERT.PGs("PG1")Set myED = myBERT.EDs("ED1")Set m

Note that you can optionally define a trigger for a specific bit in the pattern:1Define the trigger out mode.SOURce3:TRIGger:MODE PATTern2Set the bit

SOURce1:PATTern:APCHange:SELect AHALf | BHALf | ABHAlfExamples for Using User Patterns in SCPITo set up a user pattern using SCPI:1Set the error detec

SOURce1:APCHange:SOURce EXTernal3Define that alternate patterns should be sent.SOURce1:APCHange:MODE ALTernateThe following commands expand on the pre

6And then set up output to automatically alternate between pattern A andpattern B.SOURce1:PATTern:APCHange:SELect ABHAlfThese commands allow one insta

The second block generates a PRBS of polynomial 2^23 -1 as payload data. It isrepeated until the Auxiliary In port of the pattern generator receives a

bertPg.Sequence.Expression = @"(Version= 1.0; Start= IMM; Block 1= C:\<Instrument Model>\Pattern\MyHeader.ptrn; Block 2= PRBS23, 512, Trig

1 Programming BasicsProgramming Basics - ConceptsThis document provides the information you need for programming the SerialBERT using the Agilent IO L

Working with 8B/10B SymbolsWorking with 8B/10B Symbols – ConceptsThe Serial BERT provides the enhanced capability to perform a receiver (RX) jittertol

How to Set Conversion FactorThe following command sets the conversion factor. Conversion factor is used tocalculate the calculated Bit Error Ratio.SEN

How to Display Symbol Frame Error ResultsThe following command configures the results as cBER, SER, FER, FSR, DER or ISRand displays it on the Results

2The following query returns the “Instantaneous” number of error frames,calculated from the counts obtained in the last deci-second. This value isavai

2The following query returns the “Instantaneous” number of illegal symbolcount, calculated from the counts obtained in the last deci- second. This val

2The following query returns the "instantaneous" data rate ratio (Actual DRR)calculated from the counts obtained in the last deci-second. Th

of the Skip Ordered Set (SKPOS) primitives. The change in the SKPOS length byDUT is to compensate for the speed differences of the clock domains. DUT/

[P]FETCh[:SENSe[1]]:FSRatio[:ALL][:FULL][:TOTal]?4The following query returns the "instantaneous" SKPOS Bit Ratio calculatedfrom the counts

[P]FETCh[:SENSe[1]]:ARSCount?3 Recommended Programming Techniques78 Agilent J-BERT N4903B High-Performance Serial BERT

4 SCPI Command LanguageSCPI Command Language - ConceptsThe Serial BERT is compatible with the standard language for remote control ofinstruments. Stan

Before You BeginBefore You Begin - ConceptsThis section provides background information that you need before you start withremote programming. It cont

• International Institute of Electrical and Electronics Engineers. IEEE Standard488.2-1987, IEEE Standard Codes, Formats, Protocols and Common command

is good technique, then, to periodically poll the OPC bit to determine if theoverlapped command has completed.• *WAIThe *WAI command allows no further

– <NR2>: Number with an embedded decimal point (0.1, 0.001. 3.3, etc.)– <NR3>: Number with an embedded decimal point and exponent (1e33,1.

Instrument ModelSCPI guidelines require that the Serial BERT is compatible with an instrumentmodel. This ensures that when using SCPI, functional comp

Optional Command KeywordsSome layers in the SCPI command structure are optional. These optional keywordsare indicated by square brackets ([]). A typic

Command SeparatorsThe SCPI command structure is hierarchical and is governed by commas,semicolons and colons:• Commas are used to separate parameters

PRBS(n) This is the parameter required by thePATTern command keyword.N O T EAny optional commands are enclosed in square brackets [ ] and any optional

• It is out of context.Sending Commands using VISAThe following code example shows how to use the Agilent IO Libraries Suite toconnect to the instrume

4 SCPI Command Language88 Agilent J-BERT N4903B High-Performance Serial BERT

5 SCPI Command ReferenceSerial BERT SubsystemsT I PYou can use the Output Window in the instrument's user interface to monitor theSCPI commands a

Connecting to the Serial BERTN O T ETo communicate with the Serial BERT from a remote computer, the Agilent IOLibraries Suite must be installed on thi

The SENSe subsystems control the expected input signal. They correspond to theSOURce subsystems. The INPut subsystems correspond to the OUTPutsubsyste

IEEE CommandsIEEE Commands – ReferenceMandatory CommandsThe following mandatory IEEE 488.2 commands are implemented:Table 9Name Description under*CLS

This command clears all status data structures in a device. For the Serial BERT,these registers include:SESR IEEE 488.2OPERation Status Register SCPIQ

*IDN?IIviDriverIdentity (IVI-compliant)*IDN?For the Serial BERT, the Identification Query (*IDN?) response semantics areorganized into four fields, se

*OPC?IAgilentN490xSystem.WaitForOperationComplete (not IVI-compliant)*OPC? CommandThe *OPC? query returns the ASCII character "1" in the Out

The query returns the current contents of the Service Request Enable Register.See “Reading the Serial BERT's Status - Reference” on page 27 for d

waits until the No Operation Pending flag is TRUE, or receipt of a dcas message,or a power on.Optional CommandsThe following optional IEEE 488.2 comma

This is a standard SCPI command. Please refer to the SCPI specification for details.*RCLIAgilentN490xSystem.RecallState (IVI-compliant)*RCL <NR1 |

SOURce[1] SubsystemSOURce[1] Subsystem - ReferenceThe SOURce[1] subsystem controls the pattern generator's Data Out port.This subsystem has the f

Table 13Name Description under:PATTern “[SOURce[1]]:PATTern Subnode” onpage 100“OUTPut[1]:DEEMphasisSubnode” on page 140“OUTPut[1]:MULTiplexer Subnode