Giga-tronics GT 9000, Operation & Maintenance Manual

Page: 100 / 238

4.1.7 AM/FM Generator Verification (Option 24 only)
This procedure verifies that the internal AM and FM function generators perform correctly.
AM Procedure Setup:
1. On the rear panel, connect AM SIG OUT to channel 2 on the scope. Connect a
frequency counter to Channel 2 Out.
2. Select AM SIN at 100% and a 1 kHz rate. At AM SIG OUT, verify that the signal is
present at a nominal 2 Vpp into 1 M
Ω
.
3.
Select AM TRI. Verify a clean signal at a nominal 2 Vpp into 1 M
Ω
.
4. Select AM SQR at 100% and a 1 kHz rate. Verify that the signal is present with a duty
cycle of 47% and 53%, and with a nominal 2 Vpp.
5. While the AM SQR is selected, vary the AM rate. Verify that the counter display is same
as the frequency display. Turn off AM.
FM Procedure Setup:
1. On the rear panel, connect FM SIG OUT to channel 2 on the scope. Connect a
frequency counter to Channel 2 Out.
2. Select FM SIN at 10 MHz DEV and a 1 kHz rate. At FM SIG OUT, verify that the
signal is present at a nominal 2 Vpp into 1 M
Ω
.
3.
Select FM TRI. Verify a clean signal at a nominal 2 Vpp into 1 M
Ω
.
4. Select FM SQR at 10 MHz DEV and a 1 kHz RATE. Verify that the signal is present
with a duty cycle of 47% and 53% and with a nominal 2 Vpp.
5. While the FM SQR is selected, vary the FM rate. Verify that the counter frequency is
the same as the displayed front panel frequency. Turn off FM.
Model GT 9000 Microwave Synthesizer
4-6
Manual No. 120AM00250, Rev C, September 1998