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  TM 11-6625-444-14-1
readouts listed in the table for the voltmeter and
the input voltages listed in table 6-12 and perform
the differential voltmeter.
the associated adjustments to obtain the digital
Ladder
i. Negative Alignment Adjustment. Using the
j. Remainder Adjustment. Using the test
setup of the preceding Negative Alignment
test setup of the preceding Ladder Alignment,
perform negative alignment adjustment as
Adjustment, perform the remainder adjustment
follows:
as follows:
(1) Set the dc voltage calibrator output to
( 1 ) On the voltmeter, set the COM-
P A R A T O R LEVEL adjustment to the fully
+8.00052 VDC.
(2) Reverse the polarity of the input voltage
counterclockwise position.
(2) Using the dc voltage calibrator, apply
to the voltmeter.
the input voltages listed in table 6-13, and per-
(3) Adjust the -CAL adjustment (A9R14)
form the associated adjustment to obtain the
to obtain a digital readout of -8.0005 on the
readouts listed in the table for the voltmeter and
voltmeter display, and a null on the differential
the differential voltmeter.
voltmeter.
k. Comparator Level Adjustment. Using the
the voltmeter which alternates between +0.9999
test setup of the preceding Remainder Ad-
and +1 .0000.
justment, perform the comparator level ad.
(4) Set the dc voltage calibrator output to
justment as follows:
+1.9999 VDC and then +2.0000 VDC, and note
(1) Disconnect the differential voltmeter
that the voltmeter digital display corresponds.
from the voltmeter.
l. Buffer DC Alignment. Using the test setup
(2) Set the dc voltage calibrator to 0.9995
of the preceding Comparator Level Adjustment,
VDC.
apply the input voltages listed in table 6-14 and
( 3 ) Adjust the COMPARATOR LEVEL
perform the associated adjustments to obtain the
adjustment (A9R61) to obtain a digital display on
readouts listed in the table for the voltmeter.
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