TB 9-6625-2243-35
Table 11c. Model 77/AN Resistance
Performance Checks
Calibrator
Test instrument
Error
Output
range settings
display indications
settings
(Ω)
(%)
(Ω)
320
100
2.2
1
3200
1k
2.1
32 k
10 k
2.1
320 k
100 k
2.1
2
3.2 M
1M
2.1
32 M
10 M
3.1
Set calibrator 2 wire Comp ON.
1
Set calibrator 2 wire Comp OFF.
2
Table 11d. Model 77/AN Dc Current
Performance Checks
Test instrument
Calibrator
Test instrument indications
range settings
output settings
Min
Max
32 mA
30 mA
29.08
30.92
320 mA
300 mA
290.8
309.2
10 A
5A
4.83
5.17
1
Connect calibrator amplifier CURRENT OUTPUT HI and LO to TI 10A and COM.
1
Table 12. Model 77/BN Specifications
Performance specifications
Test instrument parameters
(% of reading + counts)
Dc voltage
Range: 0 1000 V
Accuracy: (0.5% + 1)
Ac voltage
Range:
Accuracy:
320 mV to 320 V, 45 Hz to 1 kHz (2.0% + 5)
(2.0% + 5)
750 V, 45 Hz to 500 Hz
Dc Current
Range: 0 to 10 A
Accuracy: (2.0% + 3)
Ac Current
Range: 0 to 10 A, 45 Hz to 1 kHz
1
Accuracy: (3.0% + 2)
Range:
Accuracy:
320 Ω
(2.0% + 1)
3200 Ω to 3.2 MΩ
(2.0% + 1)
32 MΩ
(3.0% + 1)
Ac current verified by dc current checks because both use the same shunt resistors.
1
Table 12a. Model 77/BN Dc Voltage
Performance Checks
Test
Calibrator
Test instrument indications
instrument
output settings
range settings
Min
Max
320 mV
300 mV
298.4
301.6
3.2 V1
3V
2.984
3.016
32 V
30 V
29.84
30.16
320 V
300 V
298.4
301.6
1000 V
900 V
894
906
Set function switch to V dc.
1
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