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Page Title:
Table 4. Dc Differential Accuracy |
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  TB 9-6625-2252-35
Test instrument
Calibrator indications
RANGE
Decade dial
switch settings
settings
Min
Max
Adjustments
1
1.0000
0.9995
V
1.0005
V
b(2)
1
.99990
0.9994001
V
1.0003999
V
---
1
.88880
0.8883556
V
0.8892444
V
---
1
.77770
0.7773112
V
0.7780888
V
---
1
.66660
0.6662667
V
0.6669333
V
---
1
.55550
0.5552223
V
0.5557777
V
---
1
.44440
0.4441778
V
0.4446222
V
---
1
.33330
0.3331334
V
0.3334666
V
---
1
.22220
0.2220889
V
0.2223111
V
---
1
.11110
111.04445
mV
111.15555
mV
---
100
100.00
99.95
V
100.05
V
b(3) & (4)
1000
1000.0
999.5
V
1000.5
V
b(5)
b. Adjustments
(1) Set calibrator for a 10 V dc output. Adjust A2R10 11VCAL (fig. 1) until TI
indicates null (R).
(2) Set calibrator for a 1 V dc output. Adjust A2R12 1VCAL (fig. 1) until TI
indicates null (R).
(3) Set calibrator for a 100 V dc output. Connect multimeter INPUT HI and LO
indicates 0 ±0.005 V. Disconnect multimeter.
(4) Adjust A2R41 110VCAL (fig. 1) until TI indicates a null (R).
(5) Set calibrator for a 1000 V dc output. Adjust A2R40 1100VCAL (fig. 1) until TI
indicates a null (R).
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) NULL SENS switch to TVM.
(b) MODE switch to AC.
(c) RANGE switch to 1.
(d) Decade dials to 1.0000.
(2) Set calibrator for a 1 V, 200 Hz output.
(3) Set NULL SENS switch to each successively more sensitive position while
adjusting calibrator amplitude output until null is obtained on most sensitive position. If
calibrator does not indicate between 0.998 and 1.002 V, perform b (l) through (6) below.
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