TM 11-6625-444-14-2
+0.0100 (Refer to figure 619 for the location of
the dc voltage calibrator. Observe the display
adjustments.)
readout.
(10) Reverse the connections to the volt-
meter.
The displayed readout should now be
(3) Reduce the signal from the dc voltage
calibrator to +1.000 Vdc.
-0.0100 0.0001.
(4) Adjust A1-R54 for a display reading of
(11) Repeat steps (4) through (10) until
+100.000 ( 6 counts).
these requirements are satisfied.
d. -1.9 V FULL Range Adjust (A1-R106)
NOTE
If it is not possible to adjust A1-R54
to within 6 counts due to excessive
random noise peaks, follow the same
(2) Apply -1.90000 Vdc to the voltmeter
procedure as outlined in step (10) of
INPUT terminals from the dc voltage calibrator.
the previous procedure.
Observe the display readout.
c. Zero Width Adjustment (A1-R107)
(3) Adjust A1-R106 for a display readout
of -1.90000 volts.
(1) Adjust the SAMPLE RATE control for
approximately one display readout every sec-
e. -19 V Full Range Adjust (A 1-R3)
ond.
(2) Apply -19.0000 Vdc to the voltmeter
(3) Release the AUTO switch to the "out"
INPUT terminals from the dc voltage calibrator.
position.
Observe the display readout.
(4) Apply +10.00 mV dc to the voltmeter
(3) Adjust A1-R3 for a display readout of
INPUT terminals from the dc voltage calibrator
-19.0000 volts.
(A1). Observe the display readout.
f. Turnover Adjust (A1-R105)
(5) Reverse the connections to the volt-
meter INPUT terminal and observe the display
(1) Continuing with the same setup de-
readout. The absolute value should be the same
scribed in the previous step, reverse the con-
as that obtained in step (4).
nections to the voltmeter INPUT terminals. This
results in a +19.000 Vdc signal being applied to
(6) If the two readings do not agree, ad-
the voltmeter.
just the DC ZERO control to produce a display
readout that is halfway between the positive and
(2) observe the display and adjust Al-
negative readings obtained in steps (4) and (5).
R105 for a display readout of +19.0000 volts.
(7) Repeat steps (4) through (6) until both
(3) Connect the dc voltage calibrator leads
absolute readings are the same.
directly (not reversed) to the voltmeter.
(8) Connect the dc voltage calibrator leads
g. +190 V Full Range Adjust (A1-R5)
directly to produce a positive r e a d o u t .
A1-R107
for
a
readout
of
(9) Adjust
6-38
