TB 9-4931-393-24
c. Connect TI to autotransformer.
d. Connect autotransformer to 115 V ac source and adjust autotransformer for 115 V output.
e. Short POWER METER terminals (rear panel). Leave short in place throughout
f. Set MOUNT RESISTANCE switch to 100Ω and FUNCTION switch to
CALIBRATE. Allow 30 minutes for equipment to warm-up and stabilize.
a. Performance Check
(1) Connect multimeter to DIFFERENTIAL VOLTMETER terminals on rear
panel of TI.
(2) Set RANGE (MW) switch to .01.
(3) If multimeter does not indicate between 632.14 and 632.78 mV, perform b below.
Record indication.
(4) While observing multimeter indication, vary autotransformer from 105 to 125 V
and return to 115 V. The multimeter indication will remain within limits specified in (3)
above.
(5) Repeat technique of (2) and (3) above using settings, indications and
Adjustment
Multimeter indication
Test instrument
RANGE (MW)
multimeter
(V dc)
switch positions
Adjustments
indications
(V dc)
Min
Max
0.03
1.09485
1.09595
A1 R29 (R)
1.09540
0.1
1.99900
2.00100
A1 R32 (R)
2.00000
0.3
3.46246
3.46594
A1 R33 (R)
3.46420
1
0.632143
0.632777
A1 R36 (R)
0.632460
3
1.09489
1.09599
A1 R37 (R)
1.09544
10
1.99900
2.00100
A1 R40 (R)
2.00000
8
1.78796
1.78976
A1 R43 (R)
1.78886
6
1.54842
1.54998
A1 R46 (R)
1.54920
4
1.26428
1.26556
A1 R48 (R)
1.26492
2
0.893972
0.894868
A1 R51 (R)
0.894420
0.011
0.446986
0.447434
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101
1.41349
1.41491
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MOUNT RESISTANCE switch to 200 Ω. These two checks are for low and high ends of RANGE
1Set
(MW) switch for 200 Ω position of MOUNT RESISTANCE switch. If these checks are not within
tolerance, it will be necessary to perform power supply adjustments in paragraph 10 and repeat paragraph
8. Due to the interaction of A1R17 and A1R19 with RANGE (MW) switch adjustments, it may be
necessary to readjust these several times to obtain best indication in all positions.
b. Adjustments. Adjust A1R28 (fig. 1 or 2) to obtain an indication of 632.46 mV on
multimeter (R).