HP 8920B, Programmer'S Manual

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Chapter 3, HP-IB Command Guidelines
Guidelines for Operation
Reading Back Display Units Setting.
Use the Display Units query command,
DUNits?, to read back the current Display Units setting. For example, the
following BASIC language program statements query the current Display Units
setting for the
TX Power
measurement:
!Query Display Units setting for TX Power measurement.
OUTPUT 714;"MEAS:RFR:POW:DUNits?"
!Enter the returned value into a string variable.
ENTER 714;A$
The returned units-of-measure will be whatever is shown on the Test Set’s front-
panel display for the TX Power measurement: dBm, V, mV, dBuV, or W. All
returned characters are in upper case. For example, if dBuV is displayed, DBUV
is returned.
Guidelines for Display Units
• When querying a field’s setting or measurement result through HP-IB, the Test Set al-
ways returns numeric values in HP-IB Units or Attribute Units, regardless of the field’s
current Display Units setting.
• The Display Units for a field’s setting or measurement result can be set to any valid
unit-of-measure, regardless of the field’s HP-IB Units or Attribute Units.
• The Display Units setting for a field’s setting is not affected when changing the field’s
value through HP-IB.
For example, if the
AFGen1 Freq
Display Units are set to kHz, and the command
AFG1:FREQ 10 HZ is sent to change AFGen1’s frequency to 10 Hz, the Test Set dis-
plays
0.0100 kHz
; not 10 Hz.