(b) POLARITY PULSE to OFF.
(6) Adjust meter test set for 25-millivolt indication on
(c) UP SCALE ZERO for center-scale 0
unit under test.
(7) Indication on Electronic Voltmeter should be
indication.
between 24.25 and 25.75 millivolts.
(3) Adjust Decade Resistor, ZM-16/U number 1 to
990 ohms and decade resistor number 2 to 10 ohms.
b. Adjustments.
(4) Adjust d-c output of Meter Test Set TS-
(1) Repeat a(1) and (2).
682/GSM-1 to 100 millivolts.
(2) Adjust d-c output of meter test set for 10 millivolt
(5) Adjust decade resistor number 2 for 1 mv (full
indication on electronic voltmeter.
scale) indication on unit under test. (Setting of decade
(3) Adjust left zero 10MV AND UP potentiometer (fig.
resistor number 2 should be between 9.6 and 10.4 ohms.)
(6) Adjust decade resistor number 2 to 0 ohms.
(7) Turn LOW MVS switch on unit under test to
10. 100 Millivolt and Up Ranges. a. Performance
2.5MV MID-ZERO and adjust UP SCALE ZERO for center
Check.
scale 0 indication on meter of unit under test.
(8) Adjust decade resistor number 1 to 975 ohms
(1) Connect d-c output of meter test set to input
and decade resistor number 2 for 2.5 MV (full scale)
leads of unit under test.
indication on unit under test. (Setting of decade resistor
(2) Position unit under test LOW MVS switch to USE
number 2 should be between 24.0 and 26.0 ohms.)
LEFT SWITCH 25 MV-UP and VOLTS switch as listed in
b. Adjustments.
(3) At each setting listed in table 2, adjust d-c output
of meter test set for indications on unit under test as listed
(1) If indication obtained in a(5) is not within limits,
in table 2. Indications on meter test set will be within limits
repeat a(1) through (4).
specified in table 2.
(2) Adjust LMV MID-ZERO Potentiometer (fig. 3) for
1 MV (full scale) indication on unit under test.
Table 2 100-Millivolt and Up Ranges
(3) If indication obtained in a(8) above is not within
limits, repeat a(6) and (7).
(4) Adjust decade resistor number 1 to 975 ohms
Unit under test
Meter test set
and decade resistor number 2 to 25 ohms.
indication (volts dc)
(5) Adjust 2.5 MV MID-ZERO potentiometer (fig. 3)
for 2.5 MV (full scale) indication on unit under test.
Volts setting
Meter indication
Min.
Max.
100mV
10
0.097
0.103
9.10 Mv and 25 Mv Ranges. a. Performance Check.
250mV
25
0.243
0.258
(1) Connect equipment as shown in figure 4.
1V
4
0.37
0.43
(2) Position controls on unit under test as listed in (a)
1V
6
0.57
0.63
through (c) below.
1V
8
0.77
0.83
(a) LOW MVS switch to 10 MV.
1V
10
0.97
1.03
(b) UP SCALE ZERO to OFF.
2.5V
25
2.42
2.58
(c) VOLTS to 25 MV.
10V
10
9.7
10.3
(3) Adjust meter test set for 10-millivolt indication on
25V
25
24.2
25.8
unit under test.
100V
10
97
103
(4) Indication on Electronic Voltmeter ME-202/U
250V
25
242
258
should be between 9.7 and 10.3 millivolts.
1,000V
10
970
1030
(5) Turn LOW MVS switch on unit under test to USE
LEFT SWITCH 25 MV-UP.
TAGO 640A
5
