TM 11-5840-208-30-1
(12) Set the bridge potentiometer to 0404. If the meter nulls, proceed to the next step. If the meter does not null,
mechanical alignment of R832 is required. The C dial should be 1.00 + .03; if it doesn't, adjust the arm of R885.
Note: Rotate the lower range handwheel to 10,000 meters; the C dial should remain at 1.00 + .03. Oscillation may
start at approximately 7, 000 meters; if it does, reduce the gain of AR 927A until the oscillation stops. If the C dial
does not remain at 1.00 + .03, realign R831 and R832.
d. The accuracy of the coordinate subassembly can be checked by inserting a series of 10 static problems (chart III).
Comparison of the computed solutions with the approved solutions may indicate the need for alignment of the coordinate
subassembly.
(1) Operate the EASTING switch until the ER counter reads the value listed in chart III.
(2) Operate the NORTHING switch until the NR counter reads the value listed in chart III.
(3) Place the ∆A and ∆R handwheels in DETENT.
(4) Position the RL handwheel until the RW counter reads the value listed in chart III.
(5) Operate the AZ ORIENT switch until the AZW counter reads the value given in chart III.
(6) Compare the computed solution with the approved solution.
Chart III. Coordinate Subassembly Accuracy Check
ER
NR
RW
AZW
EW
NW
000000
000000
10000
0000
000000
010000
000000
000000
5000
0000
000000
005000
000000
000000
4000
533
002000
003464
000000
000000
3000
800
002121
002121
000000
000000
1000
1333
000966
000259
005000
005000
2000
1600
007000
005000
005000
0050Q0
3500
2667
006750
001969
005000
005000
4500
3733
002750
001103
008000
005000
6000
4800
002000
005000
008000
005000
8000
5600
002343
010657
008000
005000
4000
6133
006965
008864
000000
000000
5000
1600
005000
000000
000000
000000
5000
3200
000000
995000
000000
000000
5000
4800
995000
000000
Unacceptable errors: When any easting or northing error exceeds 15 meters or when more than 5 easting or
northing errors exceed 10 meters.
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