ESI 250-DA - Troubleshooting Chart for Inoperative Bridge Conditions

6.2.2
TROUBLE
SHOOTING
CHART
(cont.
i)
SYMPTOM
PROBABLE
CAUSE
PROCEDURE
Bridge
inoperative
for
dc
measurements
(cont.
)
Open,
shorted,
or
defective
resistor
Test
resistors
R-1
through
R-10
and R-22, R-23
for
open and
shorted
circuits
and
rated values
Faulty
LRC
decade
-
rheostat
Check
R-11
through
R-20
and
R-26
for continuity
and for accuracy of resist-
ance values corresponding
to
settings of
the
LRC dial
Defective
galvanometer
Check galvanometer
for
proper operation
Bridge
inoperative
for
ac
resistance
measure-
ments
D-Q
jumper
removed
Detector
unplugged
Replace
D-Q jumper
Plug detector into
EXT DET
terminals
Defective
ac
generator
Test
ac generator
for
proper
voltage
Faulty
switch
Check
all switches for
proper
contact
and oper-
ation
Open,
shorted,
or
defective
resistor
Test resistors
R-4
through
R-10, R-22, and
R-23 for
open
and shorted
circuits
and for rated values
Bridge
inoperative
for
inductance
and capaci-
tance
measurements
Replace
D-Q
jumper
Unlock
galvanometer
Replace D-Q jumper
Plug
detector
into
EXT DET
terminals
Defective ac
generator
Test ac generator
for
proper voltage
Faulty
switch Check all switches for
proper
contacts
and oper-
ation
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250-DA
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