TB 9-6625-1962-24
9. Dc Current
a. Performance Check
(1) Set MODE/RANGE switch to DC CURRENT 2mA.
(2) Adjust calibrator to obtain indicator oscilloscope readout display of 2.000 mA.
Calibrator will indicate between 1.988 and 2.012 mA for model 7D13. If calibrator does not
indicate between 1.988 and 2.012 mA for model 7D13A, perform b below.
(3) Repeat technique of (1) and (2) above for MODE/RANGE switch and calibrator
outputs listed in table 4. Calibrator indications will be within limits specified.
Table 4. Dc Current
Test instrument
Indicator
Calibrator indications
MODE/RANGE
oscilloscope
(mA)
switch positions
readout display
indications(mA)
Min
Max
DC CURRENT 20mA
20.00
19.88
20.12
DC CURRENT 200mA
200.0
198.8
201.2
DC CURRENT 2A
2000
1988
2012
b. Adjustments
NOTE
No adjustments can be made on model 7D13.
(1) Set calibrator output to 2.00 mA and adjust R1001 AMPS (fig. 1) for a 2.000 mA
indication on indicator oscilloscope.
10. Resistance
a. Performance Check
(1) Set MODE/RANGE switch to RESISTANCE 20 k .
nominal output.
(2) Set calibrator for a 19 k
(3) Rotate calibrator knob below EDIT FIELD pushbutton to adjust calibrator
display indication to equal TI indication. If calibrator err display does not indicate within
0.55%, perform b below.
(4) Repeat technique of (1) through (3) above, using calibrator outputs and TI
Table 5. Resistance
Test instrument
Indicator oscilloscope
Calibrator
err
Readout display
MODE/RANGE switch
Nominal output display indication
indications
( )
( )
(%)
positions
190.0
190.0
0.55
RESISTANCE 200
190.0
190.0
1.00
RESISTANCE 2 k
1900
1.900 k
0.55
RESISTANCE 2 k
CHANGE 1 7
