Tektronix AM700 UNIT Subsystem

UNIT Subsystem
3–182 AM700 Audio Measurement Set Programmer Manual
UNIT Subsystem
Default units are defined, where applicable, for each SCPI command. The UNIT
subsystem provides a mechanism to change the default values. The units selected
apply to the designated command parameters for both command and response, but
NOT to the displayed units in the AM700 displays.
A simple version of the UNIT subsystem is in place in the AM700. It has the global
headers: UNIT:VOLTage, UNIT:FREQuency, UNIT:POWer, UNIT:TIME,
UNIT:IMPedance, and UNIT:RATio. The use of units are only applied to the
query replies or command entries, not to the displayed units in the applicatiion
readouts. Trace data queries also do not follow the units commands; traces have
fixed unit selections that depend on the measurement and application. The front
panel Units selection does not affect the SCPI units setting for a numerical value.
The following set of SCPI commands illustrate how the UNIT commands may be
used.
Example: unit:freq?
Hz
sour1:freq:cw?
18668.0000
unit:freq khz
sour1:freq:cw?
18.6680
UNIT:FREQuency [Hz|kHz|MHz]
Usage: Sets or queries the unit associated with a FREQuency query reply or command
entry.
Parameters: Hz, kHz, MHz
Default: Hz
Query: UNIT:FREQ? returns the current unit setting for FREQuency as Hz, kHz, or
MHz.
*RST: Sets the Frequency units to Hz.
AM700 Use of
the Unit
Subsystem