Table 3-2 Continued
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
above with the indication
shown directly on counter dis-
play.
9
When a correct readout is ob-
1/2- to 3/4-inch stable display on
Defect within frequency converter.
Refer to frequency converter
tained, set AFC switch to ON
built-in cathode ray tube.
manual.
ADD 1 MC. Adjust gain con-
trol for a 1/2- to 3/4-inch ver-
tical presentation on built-in
cathode ray tube.
Built-in cathode ray tube displays
Refer to frequency converter
10
Adjust main and FINE TUNING
Defect within frequency converter.
controls to obtain 1:1 Lissa-
a 1:1 Lissajous pattern.
manual.
jous pattern on built-in cath-
ode ray tube.
11
Record indication displayed on
Digital counter displays frequency
Defect within digital counter.
Refer to digital counter manual.
counter.
1 MHz lower than frequency of
Defect within frequency converter.
Refer to frequency converter
source being measured.
manual.
Table 3-2. Operational Check and Troubleshooting Chart of Frequency Measurement Setups for an Active Source Above 12.4 GHz
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
1
Adjust unit under test to provide
Defect within signal source.
Refer to paragraph 3-13 of this
adequate signal outpu t. Oper-
nals of signal source and unit
section and to BWO power
sup-
ate signal source in leveled
under test.
ply manual.
CW mode. Adjust oscilloscope
Refer to oscilloscope manual.
for best display.
Defective component in test setup.
Locate and replace defective
com-
ponent.
2
Adjust rf head frequency for a
Defect within signal source
Refer to paragraph 3-13 of this
pattern.
section and to BWO power
sup-
ply manual.
3
Alternately a d j u s t frequency
Amplitude of zero-beat pattern in-
Replace frequency multiplier.
multiplier and BIAS VOLTS
creases.
Defect within BWO power supply.
Refer to BWO power supply
man-
ADJUST control to obtain
ual.
maximum amplitude of zero-
beat pattern.
4
Alternately adjust frequency
Amplitude of zero-beat pattern in-
Replace frequency multiplier.
Tune
multiplier and BIAS VOLTS
creases.
Rf head not tuned to correct
rf head so that next higher
har-
ADJUST control to obtain
monic zero beats against the
unit
maximum amplitude of zero
under test signal.
beat.
3-4