TB 9-6625-2354-35
Table 14a. Simpson, Model 270-4 Specifications
Test instrument parameter
Performance specification
Dc voltage
Range: 0 to 1000 V
1.75% of FS
Accuracy:
Ac voltage
Range: 0 to 1000 V
3% of FS
Accuracy:
Range: 0 to 20 MΩ
1.75 of arc for RX1 range, 1.25 of arc
Accuracy:
for all other ranges
Dc current
Range: 0 to 10 A
1.25% of FS for 50 A range, 1.75% of
Accuracy:
FS for all other ranges
Table 14b. Simpson, Model 270-4 Dc Voltage
Calibration Performance Limits and Adjustments
Dc Voltage
Test instrument1
Calibrator
Test instrument
Indication
Initial output
err indication
Dc volts range
(V)
(V)
(%)
Adjustments
1
1
1
1.75
2
2.5
2.5
2.5
1.75
10
10
10
1.75
50
50
50
1.75
None
250
250
250
1.75
500
500
500
1.75
10003
1000
1000
1.75
TI must be calibrated in horizontal position.
1
Connect positive lead to TI +1V DC input. After 1V check is complete, move positive lead to TI + input.
2
3 Move positive lead from TI + input to TI 1000V DC/AC input.
Table 14c. Simpson, Model 270-4 Ac Voltage
Calibration Performance Limits and Adjustments
Ac Voltage
Test instrument
Calibrator
Test instrument
1
Ac volts
Indication
Initial output
err indication
Adjustments
range
(V)
(V)
(Hz)
(%)
(fig. 5) (R)
2.5
2.5
2.5
60
3
R25
10
10
10
60
3
----
50
50
50
60
3
----
250
250
250
60
3
R22
500
500
500
60
3
----
10002
1000
1000
60
3
----
TI must be calibrated in horizontal position.
1
Move positive lead from TI + input to TI 1000V DC/AC input.
2
25
