TM9-4935-294-15/2
Table 3-8. Operational Check and Troubleshooting Chart of VSWR Measurement Setup Below 1 GHz
Step
Procedure
Normal indication
Possible cause of malfunction
Corrective measure
CHARGE indicator light
Defect within SWR meter .
1
Turn POWER switch on SWR
Refer to SWR meter manual
meter to LINE ON.
2
Operate Signal source in CW
Output of signal source is at cor-
Defect within signal source
Refer to paragraph 3-13 of
mode and set correct rf power
rect level.
this section.
leveL Allow appro. 0 min-
utes for equipment to warm up
Poor or improper connection
Locate adn correct poor or i
and stabilize.
in test setup.
mproper connection in test
setup.
3
Place SQUARE WAVE SELEC-
SWR meter indicates mid scale
Defect within SWR meter.
Refer to SWR meter manual.
TOR switch on BWO power
supply to ON. Adjust
Defect with signal source
Refer to paragraph 8-1S of
RANGE-DB, GAIN, and
this section.
VERNIER controls on SWR
meter for a convenient meter
reference near midscale.
4
Adjust SQUARE WAVE FREQ.
SWR meter indication "peaks".
Defect within SWR meter.
Refer to SWR meter manual.
control on BWO power supply
for maximum SWR meter de-
Defect within signal source.
Refer to paragraph 8-13 of
flection to the right.
this section.
5
Adjust FREQ screwdriver con-
SWR meter indication "peaks".
Defect within SWR meter.
Refer to SWR meter manual
trol on SWR meter for maxi-
mum meter deflection to the
right. If necessary, adjust
RANGE-DB switch or GAIN
control settings to keep pointer
on scale.
6
If necessary, a adjust BAND-
SWR meter indication does not
Defect within SWR meter.
Refer to SWR meter manual
WIDTH control. Full cw rota-
change by more than 3% of its
tion provides maximum band-
original indication.
width, and full ccw rotation
7
Set RANGE-DB control on SWR
SWR meter indicates an on-scale
Defect within SWR meter.
Refer to SWR meter manual
meter to 20 and adjust level-
reading.
set attenuator and SWR meter
Defective level-set attenuator.
Replace level-set attenuator.
GAIN control for an on-scale
indication.
8
Adjust ANGLE OF REFLEC-
SWR meter indication "peaks".
Defect within standing wave de-
Replace standing wave
TION COEFFICIENT probe
tector.
detector.
knob on standing wave detec-
tor for maximum deflection to
the right on the SWR meter.
if necessary, readjust LINE/
3-22