TB 9-6625-1493-24
(a) RANGE switch to 1.
(b) NULL switch to TVM.
(c) Voltage dials to .001000.
(10) Set calibrator for a 1 V, 400 Hz output. Adjust TI voltage dials for null
indication on each successively more sensitive position of NULL switch until null
indication is obtained on the next most sensitive position. Final TI indication will be
between 0.000975 and 0.001025.
(11) Set NULL switch to TVM.
(12) Repeat technique of (10) and (11) above with ratio transformer settings of
0.0100000 and 0.1000000. TI final indication will be between 0.009970 and 0.010030,
0.099922 and 0.100078 respectively.
(13) Disconnect ratio transformer from equipment setup.
(14) Repeat technique of (10) and (11) above for calibrator outputs and TI RANGE
switch settings listed in table 9. TI final indications will be within the limits specified.
CAUTION
Table 9 requires progressive increase in voltage output from
calibrator. To avoid damage to TI, ensure TI is set to proper
RANGE switch setting before increasing the output from
calibrator.
Table 9. Ac Voltage - Part II
Calibrator output
Test instrument
RANGE
Voltage
Voltage dial indications
(kHz)
(V)
switch settings
Min
Max
50
1.0
1
.995000
1.005000
100
1.0
1
.990000
1.010000
50
10
10
9.95000
10.05000
100
10
10
9.90000
10.10000
50
100
100
99.5000
100.5000
100
100
100
99.0000
101.0000
REDUCE CALIBRATOR OUTPUT TO A MINIMUM
b. Adjustments
WARNING
Remove input voltage before removing dust cover for C401,
C403, C405, and C502 (fig. 1).
(1) Set TI voltage dials to 1.000000.
(2) Set calibrator for a measured 1 V, 400 Hz output.
NOTE
Use calibrator outputs of 10, 100, and 500 V for 10, 100, and
1000 V ranges respectively, of TI.
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