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

Testing and Calibration
5.3.7 A3 GPIB/CAL Control Board
CAUTION
The maximum output power of the Calibrator is over 100 mW. Be sure it is working
properly before connecting the power meter.
A. Calibrator Frequency Check.
1. Connect the Frequency Counter to the PPM Calibrator output.
2. Select Calibrator TEST MODE by pressing [MENU] [F3] [F1] [7].
3. The frequency must be 1 GHz ±50 MHz.
4. Disconnect the Frequency Counter from the Calibrator output.
5. Press [CLEAR].
B. Calibrator Output Adjust.
1. Zero the Power Meter.
2. Connect the Power Meter detector to the Calibrator output on the PPM and press [7].
3. Adjust A3R16 (CALIB SET) for 0 dBm.
a. Press any numeric key. If the power meter indication is negative (e.g. -0.2 dBm), adjust
A3R16 clockwise to approximately twice the error.
b. Press any of the numeric keys to take a reading.
c. Repeat Steps a and b until the power meter reads 0.00 dBm.
4. Disconnect the detector from the PPM.
5. Press [CLEAR].
C. Power Meter Calibrate.
1. Connect the Detector to the Calibrator output (use channel A if the unit is an 8502A).
2. Press [UNITS].
3. Wait for the PPM to calibrate itself (about 1 minute).
4. Disconnect the detector from the Calibrator output.
5. If the unit is an 8502A, repeat Steps 1 through 4 for channel B.
5.3.8 A4 CPU Board
A. Time Oscillator Adjust.
1. Connect the Frequency Counter/Timer common lead to A4TP3 (COMMON).
2. Connect the Frequency Counter/Timer test lead to A4TP6.
3. Adjust A4C47 for 30.517578 µs ±0.000100 µs.
4. Disconnect the Frequency Counter/Timer test leads.
Manual No. 20790, Rev C, November 1998 5-15
Superceded by Revision D, March 2009