Agilent Technologies 8935 Series Uživatelský manuál stáhnout pdf (Strana 81)

Chapter 3 81

HP-IB Command Guidelines

Guidelines for Operation

Guidelines for Attribute Units

• When setting the value of measurement functions REFerence,

METer, HLIMit and LLIMit through HP-IB, a non–Attribute Unit

unit-of-measure must be specified in the command string, otherwise

the current Attribute Unit is assumed by the Test Set.

For example, if the Test Set is in a RESET condition and the

command MEAS:AFR:DIST:REF:VAL 10 is sent through HP-IB, the

Test Set will interpret the data as 10%, since % is the RESET

Attribute Unit for the Distortion measurement. Sending the

command, MEAS:AFR:DIST:REF:VAL 10 DBM, would set the

REFerence SET value to 10 dB.

• When querying measurement functions REFerence, METer, HLIMit

and LLIMit through HP-IB, the Test Set always returns numeric

values in Attribute Units, regardless of the current Display Units or

HP-IB Units settings. Numeric values are expressed in scientific

notation.

For example, if the REF SET measurement function is displayed as

25% on the Test Set, the value returned through HP-IB is

+2.50000000E+001 (2.5 ¥ 10

). Converting the returned value to a

format other than scientific notation must be done

programmatically.

• Before changing the Attribute Units for a selected measurement, the

Test Set verifies that all Data Function values can be properly

converted from the current unit-of-measure to the new

unit-of-measure. If it is not possible to properly convert all the

values to the new unit-of-measure, the Attribute Units are not

changed and the following error is generated: HP-IB Error: HP-IB

Units cause invalid conversion of attr.

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Agilent Technologies 8935 Series Uživatelský manuál Strana 81