TM 11-4920-292-15
connect it successively across the test points
listed in the following table. Check for resist-
a. Make sure that the field tester is discon-
ante values as listed for the designated set-
nected from any other item of equipment.
tings.
Meulitsitmnter
r s aece
Switch positions
From-
range
S1
S2
S3
(ohms)
X1
0 to 0.01
X1
0 to 0.01
X1
0 to 0.01
X1
0 to 0.01
X1
OFF
0 to 0.01
E1
X1
0 to 0.01
E1
X1
0 to 0.01
E2
X1
0 to 0.01
E2
E1/E2
-- ____________ OFF
X1
0 to 0.01
X1
0 to 0.01
E1/E2
--------------
X10,000
18K 1.8K
E1
E1
X10,000
56K 5.6K
E1
E2
X10,000
1
OFF
100K 10K
X10,000
100K 10K
2
X10,000
3
100K 10K
1
X1
0 to 0.1
2
X1
0 to 0.1
3
X1
0 to 0.1
DEMAG
X1
77.0 7.7
OFF
X1
Step 5c
OFF
E1
B, or C of connector P2, the multimeter shall
formly from 0 to 50 7 ohms to 0 as R1 is
indicate from 10 to 50 ohms.
slowly rotated from the fully counterclockwise
d. Connect multimeter ground test probe to
position to fully clockwise and back to fully
pin E of connector P2 and the continuity probe
counterclockwise.
to pin D. The multimeter shall indicate 100 to
200 ohms.
Detector Valve Continuity Test
CAUTION
a. Set controls as follows:
Do not allow more than 1.0 milliam-
pere to flow through valve sensing
Control
Position
element. More than 1.0 milliampere
will magnetize the element.
Control console:
All controls ---OFF, 0, or fully counter-
a. Set multimeter selector switch to position
clockwise
Rx 100.
Note. The E1 CHECK, E2 CHECK, and AREA
COMP controls will not necessarily indicate 0-0 when
b. Connect multimeter ground test probe to
controls are fully counterclcock wise. Do not adjust
common connection of the three secondary coils
dials to 0. E1 VOLTS vernier and E2 VOLTS vernier
of the valve assembly and pin F or magnetic
shall indicate 0-0 when controls are fully counterclock-
azimuth reference detector connector P2.
wise.
c. Using continuity test probe, check contin-
Field tester:
uity of valve secondary coils. When the con-
All controls ---OFF, 0, or fully counter-
tinuity test probe makes contact with pin, A,
clockwise
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