Model 8640B
TM 9-4935-601-14-7&P
OPERATOR'S CHECKS
RANGE MHz
FREQUENCY MHz
0.5-1
0.75000
1-2
01.5000
2-4
03.0000
4-8
06.0000
8-16
12.0000
16-32
024.000
32-64
048.000
64-128
096.000
128-256
0192.00
256-512
0384.00
512-1024
0768.00
Phase Lock
f. Set RANGE
13
to 256-512 MHz. Note that the right-hand digit on the FREQUENCY display
6
flickers between two
digits. Set COUNTER MODE LOCK
5
to ON; the flickering should stop. Slowly adjust FINE TUNE; the
FREQUENCY reading should not change. Adjust FREQUENCY TUNE
12
; the FREQUENCY display should flash at
about a 2 Hz rate and the reading should change (the reading should follow FREQUENCY TUNE).
RF Output
g. Set COUNTER MODE LOCK
5
to OFF and Source
5
to EXT 0-550. Adjust FREQUENCY TUNE
12
until
FREQUENCY
6
reads 0384.00 MHz. Step through the ranges as specified in step e, setting the COUNTER MODE
EXPAND and Source (EXT) controls
5
to obtain appropriate resolution; FREQUENCY should read approximately as
shown in step e.
NOTE
With RANGE set to 512-1024 MHz, FREQUENCY will read approximately 0384.00 MHz (the actual
frequency at RF OUTPUT).
Meter
h. Set OUTPUT LEVEL
10
to 500 mVOLTS; the meter
3
should indicate 5 on the 0-10 SCALE (the 0-10 SCALE
annunciator
2
should be lit).
Figure 3-4. Operator's Checks (3 of 5)
3-9
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