Troubleshooting Cha
ter Five: Maintenance and Troubleshootin
74
Channel Amplifiers
To test a channel:
1. Plug an external connector with a jumper wire connected between pins 2 and 8, into the
appropriate Channel Input Connector.
This connects the output of the set point buffer to the input of the channel.
2. Connect a voltmeter to the jumper wire and reference the meter to the TP1 ground,
located in the center of the Main PC board.
3. Ensure that the channel’s FLOW CONTROL SWITCH is on.
4. Place the SET POINT SOURCE SWITCH to the FLOW position.
5 Adjust the SET POINT CONTROL to produce a +5 V reading on the voltmeter.
If you cannot adjust the SET POINT CONTROL to produce a + 5V reading, proceed to
Internal +5 V Voltage Reference,
page 75.
6. Turn the Zero Pot 25 turns counterclockwise (CCW) and then 12 turns clockwise (CW)
to center it.
7. Set the SCALING CONTROL to 100 (10% of FS).
The DPM should display +1000, ±15 counts.
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