TM 11-5840-208-30-1
(7)
With the TEST-NORMAL switch at TEST, adjust test calibration potentiometer R898 for a C dial reading of 1.00.
(8)
Repeat steps in (6) and (7) above until the C dials read correctly in both switch positions. Return the switch to
NORMAL.
(9)
Raise elevation to +70 mils. The C dials should read 2. 00. If not, adjust R983 for one half the difference and
R985 for the remainder.
(10) Raise elevation to +105 mils. The C dials should read 3. 00.
Note: If correct readings are not obtained in steps in (10) above, readjust the gain potentiometer in C
servoamplifier AR927A (b(3) above). This may, in turn, require further adjustment of R885 and R898 as in (6)
and (7) above.
g. Alignment of ∆A Potentiometer R841.
(1)
Connect the red test lead to J891.
(2)
Connect the black test lead to J3897.
(3)
Connect the test probe to 3880.
Set detent switch S856 at OFF and place the ∆ RANGE and ∆ AZIMUTH handwheels in detent.
(4)
(5)
Set the bridge potentiometer at 0000. If the meter nulls, proceed to the next step. If the meter does not null,
mechanical alignment of R841 is required. See paragraph 5-6c.
(6)
Connect the red test lead to J889.
(7)
Set the bridge potentiometer to 5000.
Set detent switch S856 at DETENT RELEASE and position the ∆ AZIMUTH handwheel for meter null.
(8)
(9)
Connect the red test lead to J891.
(10) Set the bridge potentiometer to 3372.
(11) Adjust ∆ A potentiometer R992 for meter null.
(12) Connect the red test lead to J892.
(13) Set the bridge potentiometer to 5000.
(14) Position the ∆ AZIMUTH handwheel for meter null.
(15) Connect the red test lead to J890.
(16) Set the bridge potentiometer to 3372.
(17) Adjust ∆ A potentiometer R993 for meter null.
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