Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
3.3 GPIB Command Descriptions
There are approximately 100 different commands available to program the 8500A for use on the GPIB.
This section provides functional information pertaining to the commands with the least complex material
covered first.
For most applications the automatic features of the PPM provide easy methods of making pulsed
measurements. However, a great deal of flexibility and control is available if you prefer to work with raw
data.
An alphabetical listing of all commands is in the Command Summary in Table 3-3.
The PPM has the following general capabilities:
• The ability to measure and output CW or Peak power, or a Ratio of two signals in Linear
(Watts) or Log (dBm) format.
• In some applications, the PPM can output the microwave frequency at which the power
measurement is being taken.
• Graphically display pulse profiles automatically.
• Markers can be defined on the pulse.
• Rise time, fall time, and pulse width can be measured and output automatically.
• Time differences between selected markers can be measured and output automatically.
• Self-test capabilities are built in.
• The PPM Calibration function automatically linearizes the detector over a 50 dB power range
for the most accurate power measurements.
• The temperature of the detectors can be monitored to verify whether the detector should be
calibrated.
• The PPM makes use of a PROM with stored frequency response data contained in the RF
detector assembly. The instrument uses the stored data to automatically compensate for
detector frequency response variations. A rear panel connector is available on the unit to
connect a V/GHz (V α F) signal to allow for automatic frequency selection and correction of
measured power.
• The use of balanced detectors enhances accuracy when used in situations where even
harmonics are present.
• Setups can be stored or recalled to and from the PPM’s non-volatile memory by GPIB
commands as well as manually through the front panel.
• Graph displays can be plotted on digital plotters. In addition, data pertaining to a pulse profile
can be output to the controller.
• A Data Fast mode disables the front panel display, allowing faster bus operation.
• Frequency information can be hidden when the PPM is used for classified testing.
☛ NOTE: The Model 8501A instrument will respond to the same command sets as the Model
8502A. The only exception is that the 8501A responds only to commands relating to
channel A.
3-14 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009