Wavetek 3000 Instruction Manual page 16

OPERATION
2 .6 .3 RF Output Check
Connect the equipment as shown in Figure
2-4 . The 10 MHz signal must beat least
0 .9 V p-p (a high frequency oscilloscope
must be used for these checks) .
2 .6 .4 AM Modulation Check (1000 Hz)
Switch the mode switch to AM . Move the
AM/FM vernier up to the 50% modulation
point .
Verify that the AM envelope dis-
played on the oscilloscope showsa peak-
to-valley
voltage difference of about
.45 V and a period of 1 ms . (See Figure
2 .6 .6 FMxl Check
Switch
the mode switch to FMxl . Move
the AM/FM Vernier up and down . Verify
that the oscilloscope shows an FM dis-
play (See Figure 2-6) .
2-6
Figure 2-5 . AM Modulation
Figure 2-6 . FM Modulation
2 .6 .7 FMx100 Check
Switch the mode
switch to FMx100
and
repeat the above check .
2 .6 .8 Frequency Vernier Check
Leaving the mode switch in the FMx100
position place the frequency switch in
the Vernier position . Verify that moving
the AM/FM Vernier from 0 to 5 kHz shows
an increase in frequency on the oscillo-
scope .
2 .6 .10 Attenuation Check
Switch the mode switch to CW . Verify
that the output vernier and attenuator
controls change
the amplitude of the
2-5) .
2 .6 .5 AM Modulation Check (400 Hz)
Move the frequency switch to the 400 Hz
2 .6 .9 Vernier Output Check
Switch the mode switch to
tion .
Verify
that moving
the AM posi-
the AM/FM
position . Verify the AM envelope per- Vernier from 0 to 50 shows an increase
iod is 2 .5 ms . in output amplitude . (NOTE : The unlevel
light may come on during this test .)