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  TB 11-6625-226-35/1
7. Preliminary Procedure. Remove unit under
(3) Operate TEST switch and adjust
test from protective cover and apply power.
potentiometer R21, for indication of 10 on
meter of unit under test. Release TEST
Note. The following paragraphs are divided into
switch.
subparagraphs a and b. When the performance check
is within tolerance, do not perform the corresponding
9. Ac Volts. a. Performance Check.
adjustment. When the performance check is not within
(1) Remove test lead from unit under test DC
tolerance, perform the corresponding adjustment before
VOLTS jack and connect to AC VOLTS
continuing with the calibration procedure. When the
jack.
performance check is not within tolerance and no
(2) Turn FUNCTION switch on -unit under
adjustment is specified, the deficiency must be
test to AC VOLTS and VOLTAGE switch
corrected before continuing with the procedure.
to 2.5v.
(3) Operate TEST switch on unit under test
8. Dc Volts. a. Performance Check.
and
adjust
DECREASE-INCREASE
(1) Connect equipment as shown in figure 2.
control for 2.5 (full scale) indication.
(2) Turn FUNCTION switch on unit under test
Release TEST switch.
to DC VOLTS and VOLTAGE switch to
(4) Operate TEST switch on unit under test
2.5 V.
and using electronic voltmeter, observe
(3) Operate TEST switch on unit under test
voltage indication between 2.438 and
and
adjust
DECREASE-INCREASE
2.563 volts.
control for 2.5 (full scale) indication.
(5) Repeat steps (3) and (4) using VOLTAGE
Release TEST switch.
switch positions and meter indications
(4) Operate TEST switch on unit under test
listed in table III. Verify that electronic
and using Electronic Voltmeter ME202/U
voltmeter indications are within limits
in VTVNI function observe voltage
specified in table III.
indication between 2.438 and 2.563 volts.
Release TEST switch.
Table III. Ac Volts Check
(5) Repeat steps (3) and (4) using VOLTAGE
Unit under test
Electronic voltmeter
switch positions and meter indications
indication, (volts)
listed in table II. Verify that electronic
Voltage switch
Meter (Ml)
Min
Max
voltmeter indications are within limits
position
indication
specified in table II.
s (full
scale)
5v
5
4.87
5.125
Table II. Dc Volts Check
5
Unit under test
Electronic voltmeter
10v
10
9.75
10.25
indication
0
(volts)
25v
2.5
24.38
25.63
Voltage
Meter (,Ml) indi-
Min
Max
50v
5
48.75
51.25
switch
cations (full
position
scale)
100v
10
97.50
102.5
250v
2.5
243.8
258.3
5v
5
4.90
5.10
500v
5
487.5
512.5
10v
10
9.80
10.2
25v
2.5
24.5
25.5
b. Adjustments.
50v
5
49.0
51.0
(1) Turn unit under test VOLTAGE switch to
100v
10
98.0
102
100V.
250v
2.5
245
255
(2) Operate TEST switch and adjust unit
500v
5
490
510
under
test
DECREASE-INCREASE
control for 100.0-volt indication on
b. Adjustments.
electronic voltmeter.
(1) Turn unit under test VOLTAGE switch to
(3) Operate TEST switch and adjust
100V.
potentiometer R24 (fig. 3), for indication
(2) Adjust
unit
under
test
of 10 on meter of unit under test. Release
DECREASEINCREASE control for 100.0-
TEST switch.
volt indication on electronic voltmeter.
4
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