Table 3-3-Continued
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
11
Divide fH by fH-fL to obtain
Digital counter indicates frequency
Defect within digital counter.
Refer to digital counter manual
harmonic number of fL Set
of interest on response curve of
HARMONIC PRESET selec-
passive device under test.
Frequency converter set to in-
Repeat 5 through 11.
tor switches to harmonic num-
correct harmonic number.
ber of fL, and read frequency
of interest on response curve
of passive device under test di-
rectly on counter display.
12
Tune frequency converter to fi.
Frequency display is the same as
Harmonic preselector switches set
Repeat 5 through 12.
Reduce setting of harmonic
obtained in 11 above.
too high
selector switches by 1. Verify
the indication obtained in 11
above w i t h the indication
shown directly on counter dis-
play.
13
When a correct readout is ob-
1/2- to 3/4-inch stable display
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.
14
Adjust main and FINE TUNING
Built-in cathode ray tube displays
Defect within frequency converter.
Refer to frequency converter
controls to obtain 1:1 Lissa-
a 1:1 Lissajous pattern.
manual.
jous pattern on built-in cath-
ode ray tube.
15
Record indication displayed on
Digital counter displays frequency
Defect within digital counter.
Refer to digital counter manual
counter.
1 MHz lower than frequency of
interest on response curve of
Defect within frequency converter.
Refer to frequency converter
passive device under test.
manual
Table 3-4 Operational Check and Troubleshooting Chart of Frequency Measurement Setups for a Passive Device Above 12.4. GHz
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
1
Adjust and level-set s i g n a 1
Power meter indicates correct out-
Defect within signal source no. 1.
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
Oscilloscope displays frequency
Defect within BWO power supply.
Refer to BWO power supply
selector switch to INT
response pattern of passive de-
manual.
SWEEP, and adjust SWEEP
vice.
Defect within oscilloscope.
Refer to oscilloscope manual
WIDTH control for desired
dispersion about center fre-
Poor or improper connection in
Locate and correct poor or im-
quency. Adjust oscilloscope
test setup.
proper connection in test
setup.
3-8
