TB 9-6625-2119-24
Table 4. Ac Voltage - Continued
Calibrator
Test instrument
Adjustments
Output
Output
Indication limits
amplitude
frequency
Range
Min
Max
b (5) and (6)
19 V
10 kHz
20
18.76 V
19.24
V
190 V
40 Hz
200
188.5 V
191.5
V
b (7) and (8)
190 V
10 kHz
200
187.6 V
192.4
V
1000 V
40 Hz
1000
975
V
1025
V
1000 V
1 kHz
1000
957
V
1043
V
(4) Set calibrator output to minimum.
b. Adjustments
(1) Set calibrator for an output amplitude of 190.00 mV and an output frequency of 94 Hz.
(2) Adjust 190 mV AC CAL ADJ R25 (fig. 1) until TI indicates 190.0 (R).
(3) Set calibrator for an output amplitude of 1.9 V and an output frequency of 5 kHz.
(4) Adjust 2 V AC FREQ COMP ADJ C50 (fig. 1) until TI indicates 1.900 (twist the
Teflon pair tighter to increase capacitance or incrementally cut twisted pair to reduce
capacitance (R).
(5) Set calibrator for an output amplitude of 19 V and an output frequency of 5 kHz.
(6) Adjust 20 V AC FREQ COMP ADJ C51 (fig. 1) until TI indicates 19.00 (R).
(7) Set calibrator for an output amplitude of 190 V and an output frequency of 5 kHz.
(8) Adjust 200 V AC FREQ COMP ADJ C52 (fig. 1) (twist the Teflon pair tighter to
increase capacitance or incrementally cut the twisted pair to reduce the capacitance) until
TI indicates 190.0 (R).
10. Dc Current
a. Performance Check
(1) Connect TI A to calibrator OUTPUT HI and TI COMMON to calibrator
OUTPUT LO.
(2) Position controls as listed in (a) through (c) below:
(a) AC/DC mode pushbutton released to DC.
(b) Range 200 pushbutton pressed.
(c) A mode pushbutton pressed.
(3) Set calibrator for an output of 190 mA. TI will indicate within limits specified in
first row of table 5.
(4) Repeat technique of (2) (b) and (3) above using settings listed in table 5. TI will
indicate within limits specified in table 5.