TB 9-6625-2270-24
9. Ac Voltage
a. Performance Check
(1) Press DC/AC pushbutton to AC (in) and press the 200 mV range pushbutton.
(2) Set TI range and calibrator for voltages and frequencies listed in table 4. TI will
indicate within the specified limits; if not, perform b below.
Table 4. Ac Voltage
Calibrator output
Test instrument indications
Test instrument
range pushbutton
Voltage
Min
Max
200 mV
190
mV
20 Hz
185.70
194.30
200 mV
190
mV
1 kHz
185.70
194.30
200 mV
190
mV
10 kHz
185.70
194.30
200 mV
190
mV
50 kHz
185.70
194.30
2
1.9
V
20 Hz
1.8570
1.9430
2
1.9
V
1 kHz
1.8570
1.9430
2
1.9
V
10 kHz
1.8570
1.9430
2
1.9
V
50 kHz
1.8570
1.9430
20
19
V
20 Hz
18.570
19.430
20
19
V
1 kHz
18.570
19.430
20
19
V
10 kHz
18.570
19.430
20
19
V
50 kHz
18.570
19.430
200
190
V
20 Hz
185.70
194.30
200
190
V
1 kHz
185.70
194.30
200
190
V
10 kHz
185.70
194.30
200
190
V
50 kHz
185.70
194.30
750 V AC
750
V
40 Hz
730.0
770.0
750 V AC
750
V
1 kHz
730.0
770.0
750 V AC
750
V
10 kHz
730.0
770.0
750 V AC
200
V
50 kHz
191.0
209.0
b. Adjustments
(1) Set TI range to 2 and calibrator for a 1.9 V, 45 Hz output. Adjust R7 (fig. 1) for a
TI indication of 1.9000 (5 digits) (R).
(2) Set calibrator for a 100 mV, 45 Hz output. Adjust R29 (fig. 1) for a TI indication
of 0.1000 (1 digit) (R).
(3) Repeat (1) and (2) above until no further adjustments are required.
(4) Set TI range to 20 and calibrator for a 19 V, 10 kHz output. Adjust C1 (fig. 1) for
a TI indication of 19.000 (10 digits) (R).
(5) Set TI range to 200 and calibrator for a 100 V, 10 kHz output. Adjust C2 (fig. 1)
for a TI indication of 100.00 (5 digits) (R).
(6) Repeat (4) and (5) above until no further adjustments are required.
NOTE
Do not perform (7) and (8) below unless an out-of-tolerance
condition exists on the 750V AC range.
