Wavetek 3000 - Page 64

PERFORMANCE TESTS
PROCEDURE

1 . Set the Signal Generator controls as follows :
4- 24
FREQUENCYselector

520 .000
MHz
MODULATION MODE

FMx100
MODULATION FREQ

EXT
MODULATION FM/AM

0 kHz
OUTPUT VERNIER

+3 dBmreadingonOUTPUTmeter
OUTPUT step attenuator

+10 dBm
2 . Connect the equipment as shown in Figure 4-6 .
Oscilloscope
TEE
Figure 4-6
. FM Bandwidth
Setup
3 .

Set the modulationmeter to read FM deviation at 520
MHz .

Set the RF input attenuation to 20 dB, the IF band-
width to ±400 kHz, the
meter response to fast, the function
switch to
+FM,
the meter range switch to
300 and the filter
bandwidth to 75 kHz .
4 . Set the function generator for a 1 kHz sine wave out-
put and the attenuator controls for a 10 volt p-p sine wave
on the oscilloscope .
5 .

Adjust the Signal Generator MODULATION FM/AMcontrol for
a modulation meter reading of 0 dB (approximately 320 kHz
deviation) .
6 .

Maintain the 10 volt p-p output level and slowly increase
the
function generator frequency from 1 to 25
kHz
while
observing the dB scale on the modulation meter
.

It should
read between +1 and -1 dB . Note the maximum change from the
0 dB calibration level .
7 .

Repeat steps 4 through 6 with the modulationmeter func-
tion switch set to -FM . Note the change from the 0 dB set-
ting as in step 6 .