TB 9-6625-1976-24
Table 5. Voltage Accuracy - Continued
AC measurement std
Test Instrument
indications
VOLTAGE
Out-of-
FREQUENCY
RANGE
tolerance
RANGE-Hz
dials
switch
VOLTAGE
adjustment
switch settings
(Hz)
settings
dials
Min
Max
sequence
Step
20
1M
0.300
M
100 mV
100.0000
99.64 mV
100.36 mV
21
1K
1.0000 K
10 mV
10.0000
9.988 mV
10.012 mV
22
100 K
30.00
K
10 mV
10.0000
9.975 mV
10.025 mV
23
100 K
90.00
K
10 mV
10.0000
9.975 mV
10.025 mV
24
1M
0.300
M
10 mV
10.0000
9.937 mV
10.063 mV
25
1K
1.0000 K
1 mV
1.0000
0.9898 mV
1.0102 mV
26
1M
0.300
M
1 mV
1.0000
0.9667 mV
1.0333 mV
b. Adjustments (Figure 1)
NOTE
Adjustments sequenced together interact with each other and
should be adjusted until the indications converge.
(1) Set VOLTAGE RANGE to 10 V and VOLTAGE dials to 1.00000 V.
(2) Adjust A8R63 for TI measured output of between 0.99995 and 1.00005 V (R).
(3) Set VOLTAGE dials to 10.0000 V.
(4) Adjust A12R48 for TI measured output of between 9.9995 to 10.0005 V (R).
(5) Repeat steps 1 and 2 of table 5, if indications are out-of-tolerance, and repeat
b (1) through (4) above until an in-tolerance condition is achieved.
(6) Set VOLTAGE RANGE switch to 100 V and VOLTAGE dials to 100.0000 V.
(7) Adjust A6R9 for TI measured output of between 99.995 and 100.005 V (R).
(8) Set FREQUENCY RANGE-Hz switch to 1 MHz and FREQUENCY dials to
1.0000 M.
(9) Set VOLTAGE RANGE switch to 10 V and VOLTAGE dials to 10.00000 V.
Measure and record error of TI output.
(10) Set VOLTAGE dials to 1.00000 V. Measure and record error of TI output.
0.02 percent of indication
(11) If indication recorded in (10) above is not within
recorded in (9) above, adjust A8R89 (R).
(12) Repeat steps 4 and 5 of table 5, if indications are out of tolerance; and repeat (9)
through (11) above until an in-tolerance condition is achieved.
(13) Set VOLTAGE RANGE switch to 1 V and VOLTAGE dials to 1.000000 V.
(14) Adjust A8R91 for TI measured output of between 0.9999 and 1.0001 V (R).
(15) Set VOLTAGE RANGE switch to 100 V and VOLTAGE dials to 10.0000 V.
(16) Adjust A6C3 for TI measured output of 9.967 V (R).
10
