Wavetek 3000 Instruction Manual page 58

Figure 4-3 . Percent AM Accuracy Setup
3 . Adjust the Signal Generator MODULATION FM/AM control
to its maximum up position .
4 . The digital multimeter should read 5 .000 ±0 .020 volts
DC . If the voltage is within limits,
continue to step 5 .
If out of limits, the voltage should be recalibrated .
5 .
Adjust the Signal Generator MODULATION FM/AM control to
30% AM.
6 . The digital multimeter should
read between 1 .300
and
1 .700 volts DC . Record the reading on .line 20 of the PTR.
7 . Set the Signal Generator MODULATION FM/AM control to
90% AM .
8 . The digital multimeter should read between 4 .300 and
4 .700 volts DC .
Record the reading on line 30 of the PTR .
9 . Adjust the Signal Generator MODULATION FM/AM control to
OI AM .
NOTE : This concludes the MODULATION FM/AM control accuracy
test . As many other points may be tested as desired .
10 . Set the modulation meter to read %AM at 520 MHz . Set
the meter range switch to 100, the RF input attenuation to
10 dB, the IF bandwidth to ±400 Hz, the meter response to
fast, the function switch to +AM and the filter bandwidth
to 50 Hz-15 kHz .
11 . Adjust the Signal Generator MODULATION FM/AM control
for a reading of 1 .500 ±0 .003 volts DC on the digital multi-
meter . Set the MODULATION FREQ switch to 1 kHz and the MOD-
ULATION MODE switch to AM .