Ct Current Verification - Fluke 1750/B Calibration Manual

Applied Expected Expected
Voltage Current Reading
6.49 μA
0.649 V 20 A
6.225 μA
1.6225 V 50 A
32.45 μA
3.245 V 100 A

CT Current Verification

1. Connect the calibrator NORMAL HI to Voltage A, B, and C on the Recorder.
2. Connect the calibrator NORMAL LO to Voltage N and J on the Recorder.
3. Connect the calibrator AUX HI and LO to current input A using the current test
cable. See Figure 6. The current test calibration cable connects the voltage to all
current sense inputs and indicates that a 100 A current transformer is attached.
4. Set the calibrator output to 120.0 V @ 50 or 60 Hz on the NORMAL output and the
values from Table 7 on the AUX output.
5. Press the WAVE MENUS softkey and ensure the phase angle is 0.0 °.
6. Press the HARMONIC MENU softkey; ensure the HARMONIC selection is set to
1 and the FUNDMTL selection is set to aux.
7. Press OPR.
8. Set the calibrator to voltages from Table 7 and list the Recorder readings for that
channel.
Expected
Applied Voltage
Reading
0.4 V 20 A
1.0 V 50 A
2.0 V 100 A
9. Verify that the current LED is on.
10. Move cable to next channel and repeat steps 8 and 9 for channels B, C, N, and J.
11. Set the calibrator to STBY. Verify that the current LEDs turn off.
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Table 6. Rogowski Current Accuracy Check
A Reading B Reading
Table 7. CT Current Accuracy Check
A Reading B Reading
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C Reading N Reading G Reading
C Reading N Reading G Reading
Power Recorder
Verification Tests
Limits
± 0.20 A
± 0.35 A
± 0.60 A
Limits
± 0.20 A
± 0.35 A
± 0.60 A
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