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

Testing and Calibration
5.2.7 Analog Output Accuracy Test
Set the RF Source to generate 0 dBm CW and connect the channel A detector to the output. Connect the
DVM to the channel A analog output on the rear of the PPM and, using the procedure in step 1 of the
Power Linearity Test, set the PPM to read CW with an averaging factor of 900. Perform the following
steps:
1. Adjust the RF Source so that the PPM reads exactly 0.00 dBm. Record the reading of the DVM.
It should be less than 10 mV.
2. Adjust the RF Source so that the PPM reads exactly -10.00 dBm. Subtract the DVM reading
recorded in Step 1 from the current reading. The magnitude of the difference should be
1.000V ±5 mV.
3. If a Model 8502A is being tested, repeat Steps 1 and 2 after moving the DVM to the channel B
analog output.
5.2.8 Voltage Proportional to Frequency Test
Press [MENU] (3) [F3] to choose the source of frequency correction. Then press [F2] to select the rear
panel input. The input characteristics will then be specified as follows:
Voltage/GHz = 1.00
Sweeper Start Voltage = 0.000
Sweeper Start Frequency = 0.000
Adjust the Precision DC Source to 0.00 V and connect it to the frequency input on the rear panel of the
PPM. Select the CW Mode display. The FREQ readout at the bottom of the display should read
0.000 GHz. Set the Precision DC Source to exactly 10.00 V. The display should read
10.000 GHz ±0.050 GHz.
5.2.9 Detector Return Loss Test
Use the 8003 or another return loss test setup appropriate to the frequency range of the detectors to be
used with the PPM. Measure the return loss of the detector(s) used with the PPM. Specifications depend
on the type of detector, its frequency range, and the type of connector being used. Refer to Appendix D
to determine the specifications for the particular detector under test. When using this equipment, be sure
to allow for the bridge directivity contribution to measurement uncertainty (in dB); this must be
subtracted from the value of return loss specified for the detector.
5.2.10 Plotter Output/IEEE-488 Interface
Connect the signal generator to the PPM and display a pulse waveform in the Graph Mode. The pulse
parameters, frequency, etc. are arbitrary for the purposes of testing the GPIB plot output of the PPM.
1. Use an IEEE-488 cable to connect the graphics plotter to the GPIB output connection on the rear
panel of the PPM. Note the plotter address as selected on the plotter.
2. Press [MENU] (6) [F2] to enter the plotter address. If the current address is different from the
desired address, enter the correct address number.
3. Press [MENU] (2) [F3] to begin the plot.
This completes the Performance Verification Tests of the PPM. If the instrument performed as given in
this procedure, it is correctly calibrated and within published specifications.
Manual No. 20790, Rev C, November 1998 5-7
Superceded by Revision D, March 2009