Wavetek 3000 - 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 GeneratorMODULATIONFM/AM control to
90% AM .
8 . The digital multimeter should read between 4 .300 and
4 .700 voltsDC .

Record the reading on line 30 of the
PTR .
9 .

Adjust the Signal Generator MODULATIONFM/AM control to
OI
AM .
NOTE : This concludes the MODULATION FM/AM control accuracy
test . As many otherpoints maybe 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-
ULATIONMODE
switch to
AM .