Fluke Biomedical 945A - Manual (Page 28)

Fail Alarm
Detector failure, communication loss, or UDR microprocessor failure are some of the conditions which
can produce a FAIL alarm and in some cases an error display. The fail condition is true whenever an
equipment failure is detected and false when no equipment failures are detected. When a fail condition
occurs, other than power failure, the red FAIL alarm indicator illuminates and the fail relay coil de-
energizes.
A FAIL alarm will clear automatically when the failure conditions are no longer present.
Check Source
The check source push-button and electronics are provided to verify detector operation. To operate the
check source, press the CHECK SOURCE push-button and hold it down for one second. The electronic
check source circuit will energize, the check source indicator will illuminate (green), and the check source
radiation value will be displayed on the front panel. Pressing the CHECK SOURCE push-button again will
cause the UDR to return to normal operation. Removing JP3-5 allows alarms to be activated if alarm
limits are exceeded by the check source radiation value. Installing JP3-5 allows alarms to be muted if
alarm limits are exceeded by the check source radiation value.
The analog outputs are set to zero during check source operation.
A built-in timer will turn the Check Source OFF after 10 minutes.
Firmware Version
Both detectors and UDR require a programmed PROM for operation. For the part number and the latest
revision of these PROMs, see the detector Calibration Data Sheet and/or Factory Test Data Sheet.
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