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Chapter 4 Calibration Procedures
Output Amplifier Adjustment (Optional)
4
Output Amplifier Adjustment (Optional)
This adjustment should only be performed if repairs have been made the
output amplifier circuitry (U1903, U1904, and associated components).
This adjustment is performed at the factory and re-adjustment is not
needed or recommended.
Note You must perform a complete calibration of the instrument following
this adjustment.
1 Disconnect the power cord and all input connections.
2 Remove the instrument cover. See “Disassembly”, on page 140.
3 Attach the power cord. Press and hold the “1” button and then turn on
the instrument. Be careful not to touch the power line connections.
4 The display shows a bar graph.
5 Use a long, small, flat-bladed screwdriver to adjust R1959 to minimize
the length of the bar in the display. The adjustment tool can reach R1959
through the slot in the sheet metal as shown.
6 Turn off the instrument and remove the power cord.
7 Re-assemble the instrument.
8 Perform the Adjustment and Verification procedures.
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