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Output Current Adjustment
1. Remove the 0.1 Ohm calibration resistor from the rear panel of the GF-30AC-T.
2. Connect one end of the resistor to the ground pin socket of the orange receptacle on the front of the
GF-30AC-T. Connect the other end of the resistor to the front panel jack of the GF-30AC-T that is
marked “CHASSIS”.
3. Connect the oscilloscope (or an AC RMS reading voltmeter) across the calibration resistor.
4. Press the Blue test button. Adjust R36 (located on the main board near the front left-hand corner of
the chassis) so that the voltage read across the calibration resistor is 2.5 Vrms. Using Ohms law, this
corresponds to an output current of 25 Amps. Other output current levels can be set in the same
manner.
Adjust Buzzer
5. With the calibration resistor still connected, press the Blue test button. Adjust R27 (located on the
main board near the front of the chassis in the center of the board) until the buzzer is just silent.
6. Pull out chassis return to make unit indicate a failure. Buzzer should sound.
Rear Panel Adjustments
7. Rear panel "CAL POINT" and "DURATION" adjustments can be made as described elsewhere in the
instruction manual.
At the completion of the calibration procedure, put the calibration resistor back on the rear panel of the
GF-30AC-T. Replace the top cover and tighten the screws on the sides of the tester.
Summary of Contents for GF-30AC-T
Page 1: ...GF 30AC T Ground Circuit Tester Instruction Manual...
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