Operation
Publication 21555, Rev. E, September 2002
2-5
2.5
Operation
2.5.1
SCPI Command Interface
This section details operation of the 58542 VXIbus Universal Power Meter using the SCPI (Standard
Communications for Programmable Instruments) interface commands. A SCPI command reference is
presented in Table 2-2 and the sections that follow.
SCPI commands promote consistency in definition of a common instrument control and measurement
command language. The structured approach of the SCPI standard offers test system design engineers a
number of system integration advantages that achieve considerable efficiency gains during control
program development.
SCPI compatible instrument commands are structured from a common functional organization or model
of a test instrument (See Figure 2-3). Most of the power meter configuration and measurement functions
fall within the Measurement Function Block and the Trigger Subsystem of the SCPI instrument model.
The 58542 uses the Sense Subsystem of the Measurement Function Block to implement commands that
apply specifically to the individual power sensors; sensor 1 and sensor 2. For example, the
SENSe2:CORRection:OFFSet command corrects for the attenuation of a signal that passes through an
attenuator or coupler before it is measured by power sensor 2. Figure 2-3 illustrates the SCPI subsystem
model.
2.5.2
Sensor Calibration & Zeroing
The Calibration subsystem performs sensor calibration and zeroing. CALibrate:STATe
n
selects if the
calibration data is applied or not. If STATe is ON, then the instrument uses the calibration data for
correction. If STATe:OFF is selected, then no calibration using the calibration data will be made. The
CALibrate:ZERO subsystem controls the autozero calibration of the sensor.
Figure 2-3: SCPI Subsystem Model
NOTE:
Throughout this publication, some commands will be in both upper- and lower-
case, such as CALCulate and MEMory. The uppercase is the required input. The whole
word can be used if desired. If the whole word is used, it must be used in its entirety. For
example, CALCulat will not be recognized as a valid command.
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