TM 9-4935-294-15/2
Table 3-2-Continued
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
HARMONIC PRESET selec
rect harmonic number.
of unknown signal source di-
rectly on counter display.
15
Frequency display is the same as
Repeat 8 through 15.
Reduce setting of harmonic
obtained in 14 above.
too high.
selector switches by 1. Verify
the indication obtained in 14
above with the indication
shown directly on counter dis-
play.
16
When a correct readout is oh-
1/2- to 3/4-inch stable display on
Refer to frequency converter
tained, set AFC switch to ON
built-in cathode ray tube.
manual.
ADD 1 MC. Adjust gain con-
rol for a 1/2- to 3/4-inch ver-
tical presentation on built-in
cathode ray tube.
Refer to frequency converter
17
Adjust main and FINE TUNING
Built-in cathode ray tube displays
controls to obtain 1:1 Lissa-
a 1:1 Lissajous pattern.
manual.
jous pattern on built-in cath-
ode ray tube.
18
Record indication displayed on
Defect within digital counter.
Refer to digital counter manual.
counter.
I MHz lower than frequency of
Refer to frequency converter
signal source.
manual.
19
Multiply frequency of signal
source by appropriate har-
monic number to obtain fre-
quency of unit under test.
Table 3-3. Operational Check and Troubleshooting Chart of Free Measurement Setups for a Passive Device Between 1.0 and 124 GHs
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
1
Adjust and level-set s i g n a I
Power meter indicates correct out-
Defect within signal source.
Refer to paragraph 3-13 of this
source no. 1 at desired center
put for frequency in use
section and to BWO power
frequency.
supply manual.
2
Set signal source no. 1 MODE
Defect within BWO power supply.
Refer to BWO power supply
selector switch to INT
response of passive device under
manual
SWEEP, and adjust SWEEP
test.
WIDTH control for desired
Refer to oscilloscope manual
quency. Adjust oscilloscope
Poor or improper connection in test
Locate and correct poor or im-
3-6