Figure 3. Ac current - equipment setup.

TB 9-4910-556-35

(2) Set TEST SELECT switches to 95.

(3) Press and hold TEST pushbutton until CAL appears on VTM display. Release

TEST pushbutton.

(4) Wait for offset values to appear on display. Offset values will be between -225

and +225.

(5) Set ammeter calibrator for 20 A output.

(6) Adjust precision oscillator frequency for 400 Hz and voltage output for 1.000 V

indication on digital multimeter.

(7) Press and release TEST pushbutton. VTM should display between 17.8 and

22.2. Record indication.

(8) Set ammeter calibrator for 100 A output.

(9) Adjust precision oscillator frequency for 400 Hz and voltage output for 1.000 V

indication on digital multimeter.

(10) Press and release TEST pushbutton. VTM should display between 93 and 107