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Agilent TechnologiesU1401AHandheld Multi-Function Calibrator/MeterUser’s and Service Guide

X U1401A User’s and Service GuideDeclaration of Conformity (DoC)The Declaration of Conformity (DoC) for this instrument is available on the Web site.

80 U1401A User’s and Service Guide4 Changing the Default SettingsSetting the baud rateThe baud rate used in the remote communication with a PC can be

Changing the Default Settings 4U1401A User’s and Service Guide 81Setting the display backlight timerThe display backlight timer can be set from 1 to 9

82 U1401A User’s and Service Guide4 Changing the Default SettingsSetting the power saving modeTo enable auto power- off, set this timer to any value f

Changing the Default Settings 4U1401A User’s and Service Guide 83Figure 4-13 Setting the auto power-off modePressPressPressPressPress55556666

84 U1401A User’s and Service Guide4 Changing the Default Settings

85Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide5 Application ExamplesSource Mode for mA Output 86Simula

86 U1401A User’s and Service Guide5 Application ExamplesSource Mode for mA OutputThis instrument provides steady, stepped, and ramped current output f

Application Examples 5U1401A User’s and Service Guide 87Figure 5-1 Testing a 4 mA to 20 mA current loop with the source modeRed Black

88 U1401A User’s and Service Guide5 Application ExamplesSimulation Mode for mA OutputIn simulation mode, the instrument simulates a current loop trans

Application Examples 5U1401A User’s and Service Guide 89CAUTIONDo not apply an external voltage exceeding 30 V across the output terminals of the inst

ContentsU1401A User’s and Service Guide XIContents1Getting StartedIntroducing the U1401A Handheld Multi-Function Calibrator/Meter 2Standard Purchase I

90 U1401A User’s and Service Guide5 Application ExamplesSimulating a 2-wire transmitter on a current loop The special yellow test lead supplied with t

Application Examples 5U1401A User’s and Service Guide 91Figure 5-3 Use the yellow test lead to perform the 2-wire transmitter simulationYellow BlackAl

92 U1401A User’s and Service Guide5 Application ExamplesMeasuring a Pressure TransducerTo measure a pressure transducer, follow these steps:1 Turn the

Application Examples 5U1401A User’s and Service Guide 93Figure 5-4 Pressure transducer measurementWhiteGreenLead wires1 - Red V+2 - White Out+3 - Blac

94 U1401A User’s and Service Guide5 Application ExamplesZener Diode TestTo perform zener diode test:1 Turn the rotary switch to the / position.2 C

Application Examples 5U1401A User’s and Service Guide 95Figure 5-5 Zener diode test

96 U1401A User’s and Service Guide5 Application ExamplesDiode TestA good diode allows current to flow in one direction only.To test a diode, turn the

Application Examples 5U1401A User’s and Service Guide 97Figure 5-6 Diode testForward biasRedReverse biasRedBlackBlack

98 U1401A User’s and Service Guide5 Application ExamplesBipolar Junction Transistor (BJT) TestA BJT typically has three terminals, namely emitter (E),

Application Examples 5U1401A User’s and Service Guide 995 Probe the base terminal with the red test lead, and the other two pins (in turn) with the bl

XII U1401A User’s and Service GuideContentsMeasuring DC voltage 46Measuring AC voltage 48Measuring Current 49DC mA measurement 49Percentage scale of D

100 U1401A User’s and Service Guide5 Application ExamplesAnother common type of transistor is the TO- 3 package as shown in Figure 5- 8 on page 101.Ta

Application Examples 5U1401A User’s and Service Guide 101A silicon NPN high power transistor (2N3055) is used as an example to demonstrate how the pol

102 U1401A User’s and Service Guide5 Application ExamplesDetermining transistor hfeFor NPN-type BJT1 Turn the rotary switch to the / position.2 Co

Application Examples 5U1401A User’s and Service Guide 103Figure 5-9 Determining transistor hfehfe = IC/IB = 152IB = Current sourcehfe = IC/IB = 300IC

104 U1401A User’s and Service Guide5 Application ExamplesJunction Field-Effect Transistor (JFET) Switch TestA JFET typically has three terminals, name

Application Examples 5U1401A User’s and Service Guide 105You can identify the channel type of a JFET by measuring its drain- source resistance (RDS) w

106 U1401A User’s and Service Guide5 Application ExamplesThe cutoff voltage of an n-channel JFETTo determine the cutoff voltage of an n- channel JFET:

Application Examples 5U1401A User’s and Service Guide 107The cutoff voltage of a p-channel JFETTo determine the cutoff voltage of a p- channel JFET:1

108 U1401A User’s and Service Guide5 Application ExamplesOperational Amplifier VerificationThe ideal amplifier is assumed to have the following charac

Application Examples 5U1401A User’s and Service Guide 1094 Connect the red and black alligator leads to the positive and negative output terminals res

ContentsU1401A User’s and Service Guide XIIISetting the display backlight timer 81Setting the power saving mode 825 Application ExamplesSource Mode fo

110 U1401A User’s and Service Guide5 Application ExamplesVoltage-to-current converterIn maintaining its differential input voltage at zero, the operat

Application Examples 5U1401A User’s and Service Guide 111Integrator: square wave to triangle wave conversionThe integrating circuit in Figure 5- 15 on

112 U1401A User’s and Service Guide5 Application Examples4 Use a DC power supply with +15 V and –15 V outputs to power the operational amplifier. 5 Us

Application Examples 5U1401A User’s and Service Guide 1132-Wire Transmitter VerificationYou can use the following method to verify the operation of a

114 U1401A User’s and Service Guide5 Application ExamplesFigure 5-16 Verifying a two-wire transmitterRedBlack

Application Examples 5U1401A User’s and Service Guide 115Frequency Transmitter VerificationFor some frequency transmitters, you can use the square wav

116 U1401A User’s and Service Guide5 Application ExamplesFigure 5-17 Verifying a frequency transmitter

117Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide6 MaintenanceMaintenance 118General maintenance 118Batt

118 U1401A User’s and Service Guide6MaintenanceMaintenanceGeneral maintenanceBesides the hazards mentioned above, dirt or moisture in the terminals ca

Maintenance 6U1401A User’s and Service Guide 119Battery replacementThe instrument is powered by four sets of rechargeable batteries. To ensure that th

XIV U1401A User’s and Service GuideContentsClosed-case electronic calibration 129Agilent Technologies’ calibration services 129Calibration interval 12

120 U1401A User’s and Service Guide6MaintenanceFigure 6-1 Battery replacementLoosen the screwSlide the cover to the left sideReplace all batteries

Maintenance 6U1401A User’s and Service Guide 121Recharging the batteriesThis instrument is powered by four sets of rechargeable bat-teries. Charge the

122 U1401A User’s and Service Guide6MaintenanceFuse replacementReplace any blown fuse in the instrument according to the following procedures:1 Power

Maintenance 6U1401A User’s and Service Guide 1237 Throughout the fuse replacement procedures, make sure that the knob of the rotary switch on the top

124 U1401A User’s and Service Guide6MaintenanceTroubleshootingIf the instrument fails to operate, check the batteries and test leads. Replace them if

Maintenance 6U1401A User’s and Service Guide 125When servicing the instrument, use only the specified replacement parts.Table 6- 2 will assist you in

126 U1401A User’s and Service Guide6Maintenance

127Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide7 Performance Tests and CalibrationCalibration Overvie

128 U1401A User’s and Service Guide7 Performance Tests and CalibrationCalibration OverviewThis manual contains procedures for verifying the instrument

Performance Tests and Calibration 7U1401A User’s and Service Guide 129Closed-case electronic calibrationThis instrument features closed- case electron

ContentsU1401A User’s and Service Guide XVConstant voltage and constant current outputs 155Square wave output 156

130 U1401A User’s and Service Guide7 Performance Tests and CalibrationOther recommendations for calibrationSpecifications are only guaranteed within t

Performance Tests and Calibration 7U1401A User’s and Service Guide 131Recommended Test EquipmentThe test equipment recommended for the performance ver

132 U1401A User’s and Service Guide7 Performance Tests and CalibrationPerformance Verification TestsSelf-verificationTo perform a self- verification o

Performance Tests and Calibration 7U1401A User’s and Service Guide 133Input performance verificationTo verify the input functions of the Handheld Mult

134 U1401A User’s and Service Guide7 Performance Tests and Calibration2(cont)Turn the rotary switch to . Press to select AC.Connect the Normal Hi-L

Performance Tests and Calibration 7U1401A User’s and Service Guide 1353 Turn the rotary switch to . Press to select frequency.Connect the Normal Hi

136 U1401A User’s and Service Guide7 Performance Tests and Calibration8 Turn the rotary switch to .Connect a diode to the U1401A input terminals in fo

Performance Tests and Calibration 7U1401A User’s and Service Guide 137Output performance verificationTo verify the output functions of the Handheld Mu

138 U1401A User’s and Service Guide7 Performance Tests and CalibrationAdjustment ConsiderationsTo adjust (calibrate) the instrument, you will need a s

Performance Tests and Calibration 7U1401A User’s and Service Guide 139Adjustment ProceduresInput calibration1 Set the slide switch to the M/S position

XVI U1401A User’s and Service GuideContents

140 U1401A User’s and Service Guide7 Performance Tests and CalibrationOutput calibration1 Set the slide switch to the M/S position.2 Allow the instrum

Performance Tests and Calibration 7U1401A User’s and Service Guide 141After finishing the CAL-0 and CAL-1 calibration procedures, the instrument will

142 U1401A User’s and Service Guide7 Performance Tests and CalibrationOutput current calibration1 Without exiting the calibration mode, turn the rotar

143Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide8Specifications General Specifications 144Measurement Ca

144 U1401A User’s and Service Guide8 SpecificationsGeneral SpecificationsDisplay • Both primary and secondary displays are 5-digit liquid crystal disp

Specifications 8U1401A User’s and Service Guide 145Dimensions• H = 192 mm• W = 90 mm• D = 54 mmWeight• 0.98 kg with holster and batteriesBattery Life•

146 U1401A User’s and Service Guide8 SpecificationsMeasurement CategoryThe U1401A is intended to be used for measurement under Measurement Category II

Specifications 8U1401A User’s and Service Guide 147Input SpecificationsThe accuracy is given as ± (% of reading + counts of least significant digit) a

148 U1401A User’s and Service Guide8 Specifications[1] Always use the relative function to offset the thermal effect before measuring the signal. If t

Specifications 8U1401A User’s and Service Guide 149[1] Crest factor: ≤ 3AC+DC specifications[1] Input impedance: 1.1 MΩ in parallel with <100 pF (n

U1401A User’s and Service Guide XVIITablesTablesTable 1-1. List of accessories 4Table 1-2. Slide switch functions 5Table 1-3. Rotary switch positions

150 U1401A User’s and Service Guide8 Specifications[1] Crest factor: ≤ 3Temperature specifications[1] The accuracy is defined for meter operation only

Specifications 8U1401A User’s and Service Guide 151Frequency specificationsFrequency sensitivity and trigger level for voltage measurementFor the maxi

152 U1401A User’s and Service Guide8 SpecificationsDuty cycle [1]Pulse width [1, 2] [1] The accuracy for duty cycle and pulse width is based on a 5 V

Specifications 8U1401A User’s and Service Guide 1531 ms peak hold specificationsResistance specificationsThe following resistance specifications are v

154 U1401A User’s and Service Guide8 SpecificationsDiode check and audible continuity specificationsThe overload protection is 250 Vrms and the instru

Specifications 8U1401A User’s and Service Guide 155Output SpecificationsAccuracy is given as ± (% of output + counts of least significant digit) at 23

156 U1401A User’s and Service Guide8 SpecificationsSquare wave outputThe maximum input voltage protection is 30 VDC.[1] The positive or negative pulse

© Agilent Technologies, Inc., 2009 - 2012Fourth Edition, May 4, 2012U1401-90001www.agilent.comAgilent TechnologiesContact usTo obtain service, warrant

XVIII U1401A User’s and Service GuideTablesTable 7-4. Output performance verification tests 137Table 7-5. Output voltage calibration steps 141Table 7-

U1401A User’s and Service Guide XIXFiguresFiguresFigure 1-1. The slide switch 5Figure 1-2. The front panel 7Figure 1-3. The rotary switch 8Figure 1-4.

U1401A User’s and Service GuideNotices© Agilent Technologies, Inc. 2009 - 2012No part of this manual may be reproduced in any form or by any means (in

XX U1401A User’s and Service GuideFiguresFigure 4-4. Setting the beeper frequency 73Figure 4-5. Setting the minimum frequency 74Figure 4-6. Setting t

1Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide1Getting StartedIntroducing the U1401A Handheld Multi-Func

2 U1401A User’s and Service Guide1Getting StartedIntroducing the U1401A Handheld Multi-Function Calibrator/MeterThe key features of the U1401A are:• S

Getting Started 1U1401A User’s and Service Guide 3Standard Purchase ItemsVerify that you have received the following items with your U1401A Handheld M

4 U1401A User’s and Service Guide1Getting StartedList of AccessoriesTable 1 - 1 List of accessoriesTyp e Agilent part number DescriptionStandard Prote

Getting Started 1U1401A User’s and Service Guide 5Product OverviewSlide switchThe slide switch has the following positions:• Charge: Select this posit

6 U1401A User’s and Service Guide1Getting Started5 Slide Switch —6Charging indicationIndicates the charging process.GREEN: Fully chargedYELLOW: Chargi

Getting Started 1U1401A User’s and Service Guide 7The front panel at a glance Figure 1-2 The front panelDisplayKeypadRotary switchTe r m i n a l s

8 U1401A User’s and Service Guide1Getting StartedThe rotary switch at a glanceBefore powering on the U1401A, set the slide switch to M or M/S position

Getting Started 1U1401A User’s and Service Guide 9The keypad at a glanceThe operation of each key is shown below. A related annunciator appears on the

U1401A User’s and Service Guide IIISafety SymbolsThe following symbols on the instrument and in the documentation indicate precautions which must be t

10 U1401A User’s and Service Guide1Getting StartedFigure 1-5 Keypad shifted functions89117Table 1 - 4 Keypad functionsNo. Key Function when pressed fo

Getting Started 1U1401A User’s and Service Guide 11[1] When the HOLD key is pressed for more then one second, its function depends on the present stat

12 U1401A User’s and Service Guide1Getting StartedShifted functionsEvery key (except the SHIFT key itself) has a shifted function. To access these shi

Getting Started 1U1401A User’s and Service Guide 13The display at a glanceTo view the full display (with all segments illuminated), press while turn

14 U1401A User’s and Service Guide1Getting StartedTable 1 - 6 Description of display annunciatorsLCD display annunciator DescriptionRemote controlScan

Getting Started 1U1401A User’s and Service Guide 15Thermocouple type for temperature test. The U1401A supports K-type thermocouple only. Output enable

16 U1401A User’s and Service Guide1Getting StartedInput units for primary displaySquare wave output. Positive or negative trigger slopePositive sl

Getting Started 1U1401A User’s and Service Guide 17The terminals at a glanceFigure 1-7 Te r m i n a lsThis instrument has four terminals. The two term

18 U1401A User’s and Service Guide1Getting StartedTable 1 - 8 Overload protection for the input terminalsRotary switch position Input terminal Overloa

Getting Started 1U1401A User’s and Service Guide 19The rear panel at a glance Figure 1-8 The rear panel

IV U1401A User’s and Service GuideGeneral Safety InformationThe following general safety precautions must be observed during all phases of operation,

20 U1401A User’s and Service Guide1Getting StartedDisplay selection with the Hz keyThe frequency measurement function is able to detect the presence o

Getting Started 1U1401A User’s and Service Guide 21DC current Frequency (Hz) DC currentDuty cycle (%)Pulse width (ms)AC+DC current Frequency (Hz) AC+D

22 U1401A User’s and Service Guide1Getting StartedDisplay selection with the DUAL keyPress to enable the dual display function, in which two separat

Getting Started 1U1401A User’s and Service Guide 23Remote CommunicationThe U1401A has a bidirectional (full duplex) communication capability that make

24 U1401A User’s and Service Guide1Getting Startedreattach the cover, simply slip the cover over the connector. Make sure that the text on the cover

Getting Started 1U1401A User’s and Service Guide 25Figure 1-10 IR-USB cable connectionFigure 1-11 IR-USB cableTex t s id e fa ci n gupwardIR-USB cabl

26 U1401A User’s and Service Guide1Getting Started

27Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide2Calibrator Output OperationsEnabling and Disabling the O

28 U1401A User’s and Service Guide2 Calibrator Output OperationsEnabling and Disabling the OutputThe U1401A can generate and measure signals simultane

Calibrator Output Operations 2U1401A User’s and Service Guide 29Constant Voltage OperationThe U1401A can generate a constant voltage output in two dif

U1401A User’s and Service Guide VWARNING• Do not substitute parts or modify equipment to avoid the danger of introducing additional hazards. Return th

30 U1401A User’s and Service Guide2 Calibrator Output OperationsConstant Current OperationThe U1401A can generate a constant current output in the ran

Calibrator Output Operations 2U1401A User’s and Service Guide 31Memory GenerationFor constant voltage and current outputs, the U1401A offers two addit

32 U1401A User’s and Service Guide2 Calibrator Output Operations4 After selecting the required function, press or to select one of three modes: C

Calibrator Output Operations 2U1401A User’s and Service Guide 33Table 2 - 1 Default settings for the autoscan outputMode ±1.5000 V ±15.000 V

34 U1401A User’s and Service Guide2 Calibrator Output OperationsFigure 2-1 Selecting autoscan output modePressorPressorPressorFigure 2-2 Example of a

Calibrator Output Operations 2U1401A User’s and Service Guide 35Defining the autoscan parameters in the memoryPress and hold MODE for more than one se

36 U1401A User’s and Service Guide2 Calibrator Output Operations2 Press OUTPUT to save the settings.Autoramp outputTo set the autoramp output:1 Turn

Calibrator Output Operations 2U1401A User’s and Service Guide 374 After selecting the required function, press or to select one of two modes: Con

38 U1401A User’s and Service Guide2 Calibrator Output OperationsFigure 2-4 Selecting autoramp output modeDefining the autoramp parameters in the memor

Calibrator Output Operations 2U1401A User’s and Service Guide 39used to indicate the start or end position. The last three digits of the primary displ

VI U1401A User’s and Service GuideEnvironmental ConditionsThis instrument is designed for indoor use and in an area with low condensation. The table b

40 U1401A User’s and Service Guide2 Calibrator Output OperationsFigure 2-6 Defining the autoramp outputPressMODEPressMODEEnd amplitudeStart amplitudeS

Calibrator Output Operations 2U1401A User’s and Service Guide 41Square Wave OutputThe square wave output can be used to generate a PWM (pulse width mo

42 U1401A User’s and Service Guide2 Calibrator Output OperationsThe duty cycle can be stepped through 256 equal steps, with each step equivalent to 0.

Calibrator Output Operations 2U1401A User’s and Service Guide 43Figure 2-7 Parameter selection for square wave outputPressMODEPressPress MODEPress MOD

44 U1401A User’s and Service Guide2 Calibrator Output Operations

45Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide3 Making Measurements Measurin

46 U1401A User’s and Service Guide3 Making MeasurementsMeasuring VoltageThe U1401A performs true- rms AC measurements that are accurate for square wav

Making Measurements 3U1401A User’s and Service Guide 47Figure 3-1 DC voltage measurement

48 U1401A User’s and Service Guide3 Making MeasurementsMeasuring AC voltage1 Turn the rotary switch to . 2 Press to select AC voltage measurement.3

Making Measurements 3U1401A User’s and Service Guide 49Measuring CurrentDC mA measurement1 Turn the rotary switch to .2 Press to select DC current

U1401A User’s and Service Guide VIIRegulatory MarkingsThe CE mark is a registered trademarkof the European Community. This CEmark shows that the produ

50 U1401A User’s and Service Guide3 Making MeasurementsPercentage scale of DC mA measurementThe percentage scale for 4 mA to 20 mA or 0 mA to 20 mA is

Making Measurements 3U1401A User’s and Service Guide 51Measuring TemperatureThe bead type thermocouple probe is suitable for measuring temperature fro

52 U1401A User’s and Service Guide3 Making MeasurementsTo measure temperature, follow these steps:1 Set the slide switch to the M position to disable

Making Measurements 3U1401A User’s and Service Guide 53Figure 3-4 Surface temperature measurement

54 U1401A User’s and Service Guide3 Making MeasurementsMeasuring Resistance and Testing ContinuityTo measure resistance, follow these steps:1 Turn the

Making Measurements 3U1401A User’s and Service Guide 55Figure 3-5 Resistance measurementFigure 3-6 Enabling and disabling the continuity testPress

56 U1401A User’s and Service Guide3 Making MeasurementsAlerts and Warning During Measurement Overload alert for voltage measurementThis instrument pro

Making Measurements 3U1401A User’s and Service Guide 57Math OperationsDynamic recordingThe dynamic recording mode can be used to detect intermittent t

58 U1401A User’s and Service Guide3 Making MeasurementsNOTE• If an overload condition occurs, the averaging function will stop. The recorded average v

Making Measurements 3U1401A User’s and Service Guide 59Figure 3-7 Dynamic recording modePress1 sPress 1 sPress 1 sPress 1 sPress Press Press Pres

VIII U1401A User’s and Service GuideWaste Electrical and Electronic Equipment (WEEE) Directive 2002/96/ECThis instrument complies with the WEEE Direct

60 U1401A User’s and Service Guide3 Making MeasurementsRelative (zero)The relative function subtracts a stored value from the present measured value a

Making Measurements 3U1401A User’s and Service Guide 61Triggering OperationsData hold (manual trigger)The data hold mode allows you to hold the displa

62 U1401A User’s and Service Guide3 Making MeasurementsRefresh hold (auto trigger)The refresh hold mode freezes the displayed value until the reading

Making Measurements 3U1401A User’s and Service Guide 631 ms peak holdThis function allows the measurement of peak voltage for analysis of components s

64 U1401A User’s and Service Guide3 Making MeasurementsFigure 3-10 1 ms peak hold modePress1 sPressPress to restartPress to change rangePress 1 s

65Agilent TechnologiesU1401A Handheld Multi-Function Calibrator/MeterUser’s and Service Guide4 Changing the Default SettingsEntering the Setup Mode

66 U1401A User’s and Service Guide4 Changing the Default SettingsEntering the Setup ModeTo enter the setup mode, perform the following steps:1 Turn th

Changing the Default Settings 4U1401A User’s and Service Guide 673 To configure a menu item in the setup mode, perform the following steps: i Press

68 U1401A User’s and Service Guide4 Changing the Default SettingsAvailable Setting OptionsTable 4 - 1 Setup options and default settingsMenu item Avai

Changing the Default Settings 4U1401A User’s and Service Guide 69[1] The temperature menu item will only be visible and selectable if the shifted mode

U1401A User’s and Service Guide IXIn This Guide...1 Getting StartedThis chapter contains a brief description of the U1401A Handheld Multi-Function Ca

70 U1401A User’s and Service Guide4 Changing the Default SettingsFigure 4-2 Setting the data hold or refresh hold modePressPressPressPressPress5555666

Changing the Default Settings 4U1401A User’s and Service Guide 71Setting the temperature unitFour combinations of temperature unit display are availab

72 U1401A User’s and Service Guide4 Changing the Default SettingsFigure 4-3 Setting the temperature unitPress SHIFT for more than one second to enable

Changing the Default Settings 4U1401A User’s and Service Guide 73Setting the beeper frequencyThe beeper frequency can be set to 4800 Hz, 2400 Hz, 1200

74 U1401A User’s and Service Guide4 Changing the Default SettingsSetting the minimum measurable frequencyThis setting will influence the measurement r

Changing the Default Settings 4U1401A User’s and Service Guide 75Setting the percentage scale readoutThis function converts the DC current measurement

76 U1401A User’s and Service Guide4 Changing the Default SettingsSetting the print modeSetting this feature on enables the printing of measured data t

Changing the Default Settings 4U1401A User’s and Service Guide 77Setting the echo modeSetting this feature on enables the return of characters to a PC

78 U1401A User’s and Service Guide4 Changing the Default SettingsSetting the data bitThe number of data bits (data width) for remote communication wit

Changing the Default Settings 4U1401A User’s and Service Guide 79Setting the parity checkThe parity check for remote communication with a PC can be se