TB 9-6625-1314-24
10. Dc Current (3444A only)
a. Performance Check
(1) Set FUNCTION switch to VOLTS and RANGE switch to 100 MV.
If
necessary, adjust front panel ZERO adjust to obtain an indication of 00.00 on TI.
(2) Connect TI inputs to calibrator current outputs.
(3) Set TI FUNCTION switch to AMPS and RANGE switch to 100 A.
(4) Adjust calibrator output to obtain an indication of 99.99 on TI. If calibrator
output does not indicate between 99.780 mA and 100.21 mA, perform b below.
(5) Repeat technique of (3) and (4) above using values fisted in table 5. If calibrator
output does not indicate within limits specified, perform b below.
Table 5. Dc Current
Test Instrument
Calibrator output
indication (mV)
RANGE
switch setting
Indication
Min
Max
A
999.9
997.8
A
1.0021 mA
1000
10 MA
9.999
9.978
mA
10.021 mA
100 MA
99.99
99.78
mA
100.21
mA
1000 MA
999.9
997.8
mA
1.0021
A
b. Adjustments
Set RANGE switch to 100 MA.
(1)
(2)
Set calibrator to 100 mA.
Adjust A3R26 (fig. 1) to obtain an average indication of 00.00 on TI (R).
(3)
Set RANGE switch to 1000 MA.
(4)
(5)
Set calibrator to 1000 mA.
(6)
Adjust A3R27 (fig. 1) to obtain an over range indication of 000.0 on TI (R).
Repeat a (1) through a (5) above.
(7)
11. Ac Volts (3445A only)
a. Performance Check
(1) Connect calibrator to TI INPUT.
(2) Set TI FUNCTION switch to AC and RANGE switch to 10 V.
(3) Adjust calibrator frequency to 1 kHz and voltage output to obtain an indication
of 9.000 on TI. If calibrator output does not indicate between 8.9890 V and 9.0110 V,
perform b (1) and b (2) below.