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35040
Operators Manual
4-8
4.5 Bias Error
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line:
1. Is "??Bias" displayed?
YES
NO
2
6
2. Has the instrument been on for more than one minute?
YES
NO
3
8
3.
Turn off the power. Wait 10 seconds. Turn on the power. Wait 1 minute. Is
"??Bias" displayed?
YES
NO
4
--
4. PROBLEM: Electrometer fault. See Section 4.10.
YES
NO
5
--
5.
Change the bias voltage to a different setting and then change back. Wait
about 10 seconds. Is the error on the display?
6.
Change the bias voltage to 0.0 V. Disconnect all triax cables. Cap the
connectors. Change bias voltage to desired setting. Wait about 10 seconds.
Is the error on the display?
YES
NO
7
8
7.
Change the bias voltage to 0.0 V. Examine the triax connectors on the
instrument, both front and rear, for foreign matter. Is foreign matter present?
8. See Section 4.7.
YES
NO
9
18
9. Normal operation established.
YES
NO
10
11
10. Do you use a separate cable to connect the ion chamber to the instrument?
11.
Change the bias voltage to 0.0 V. Connect only the cable to the instrument.
Change the bias voltage to the desired setting. Wait about 10 seconds. Is the
error on the display?
YES
NO
12
13
12. PROBLEM: Bias fault in cable. See Section 4.10.
13.
Change the bias voltage to 0.0 V. Connect the ion chamber. Change the bias
voltage to the desired setting. Wait about 10 seconds. Is the error on the
display?
YES
NO
14
16
14. PROBLEM: Bias fault in instrument. See Section 4.10.
YES
NO
15
17
15. PROBLEM: Bias fault in ion chamber. See Section 4.10.
16. This message is displayed until the signals from the isolated side are valid.