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1750

Calibration Manual

Neutral Voltage Verification

1. Connect NORMAL LO to A, B, C, J, and ..

2. Connect the calibrator NORMAL HI to N on the Recorder.

3. Apply the voltages from Table 5, listing the Recorder readings for the appropriate

model.

Table 5. Neutral (AC) Voltage Accuracy Check

Applied NG Reading Limits

60 V @ Local Hz ± 1.12 V

100 V @ Local Hz ± 1.20 V

4. Verify that the N LED is on.

5. Set the calibrator to STBY, verify that the LED for N turns off.

6. Disconnect the test leads from the Recorder.

Rogowski Current Verification

1. Verify the resistor in the Rogowski calibration cable is within 0.1 % of 100 kΩ.

2. Connect the calibrator NORMAL HI to Voltage A, B, and C on the Recorder.

3. Connect the calibrator NORMAL LO to N and Voltage J on the Recorder.

4. Connect the calibrator AUX HI and LO to current input A using the Rogowski

calibration cable. See Figure 3.

5. Set the calibrator output to 120.0 V @ 55 Hz on the NORMAL output and the values

from Table 6 the AUX output.

6. Press the WAVE MENUS softkey and ensure the phase angle is -90 °.

7. Press the HARMONIC MENU softkey; ensure the HARMONIC selection is set to

1 and the FUNDMTL selection is set to aux.

8. Press OPR.

9. Set the calibrator to voltages from Table 6 and list the Recorder readings for channel

10. Move cable to next channel and repeat step 9 for channels B, C,

N, and J.

Fluke 1750 Calibration Manual

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