CLOSED-CASE CALIBRATION
Perform the following to execute the front panel FM calibration procedure:
1. Set the rear panel CAL|COMP switch to the 1 (on) position.
2. Enter special function 992 to initiate the FM procedure.
3. Connect the 6080A/AN's RF output to the modulation meter.
4. Select the peak+ mode, enable the 50-Hz high-pass filter, and enable the 3 kHz
low-pass filter on the modulation meter.
5. Use the edit knob to change the adjustment value until the modulation meter reads
100 kHz
6. Press the key twice to store the new data.
Remote FM Calibration 3-10.
The following paragraphs describe the remote FM calibration procedure, the remote
commands used in the procedure, and the elements required to build a functioning
controller program. Refer to the heading "Remote Calibration" (earlier in Section 3)
for general information relating to all remote calibration procedures.
A complete program listing that runs on a Fluke 1722A controller is provided in
Appendix G.
The basic structure of the FM calibration program is shown in Figure 3-3.
initiate the FM calibration procedure with "CAL_FM"
initialize modulation meter
MAIN_LOOP:
request the RF frequency with "CC_FREQ?"
if( frequency = 9e9) goto DONE
read modulation meter
send reading to 6080A/AN with "CC_RDFM"
goto MAIN_LOOP
DONE:
store new data in calibration memory with "CC SAVE"
end
Figure 3-3. Basic Structure of FM Calibration Program
The procedure is initiated by the command CAL_FM. The controller requests the
signal generator's center frequency with the command CC_FREQ? and waits for a
response. When a response is received, the controller gets a mod meter reading and
sends it to the signal generator with the command CC_RDFM. The program remains
in the main loop until the signal generator returns the end code "9E+09, Hz" in
response to the CC_FREQ? command. The main loop is then exited and the data is
saved with the CC_SAVE command.
3-9
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