Fluke Biomedical 942A-200L-M4 - Manual (Page 45)

Operation
Operation
3
3-5
Fail Alarm
There are several equipment failure conditions that can produce a FAIL alarm and in some cases an error
display. The fail condition is true whenever any 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.
To return the channel to normal operation after a FAIL alarm, the condition, which caused the alarm, must
be located and corrected.
Check Source
The check source pushbutton and electronics are provided to verify detector operation. To operate the
check source, press the CHECK SOURCE pushbutton and hold it down. The Check Source LED will
illuminate, and the radiation value will increase. Releasing the check source pushbutton will allow normal
UDR operation. An internal configuration jumper allows alarms to be activated air deactivated in the
check source mode. The analog outputs are forced to their low scale value during a check source
operation. The bar graph remains active during check source operation.
Trip Test
The Models 942A-200L-M4 and 942A-200L-M5 UDRs are equipped with a Trip Test function. As a part of
the Trip Test option, a momentary contact push button is provided on the Front Panel to test the operation
of the front panel display and alarm relays. Pressing and holding in the TEST push button on the front
panel, SW5, results in the display of 8.8.8.8.8., turning on the backlight unit displays, illuminates the bar
graph in amber, illuminates all of the front panel LEDs, drives the analog outputs full scale, and de-
energizes the WARN, HIGH, Aux and FAIL relays.
When the TRIP push button is released, the digital display, units backlights, analog output, FAIL, RANGE,
RATE and CHECK SOURCE LEDs return to normal, the bar graph illuminates red and the WARN, HIGH,
Aux and FAIL relays energize. The HIGH and WARN alarm LEDs flash ON and OFF.
The Trip Test function is exited by pressing the Acknowledge push button. This turns the HIGH and
WARN LEDs off and returns the unit to normal operation.
Single Channel analyzer (SCA), 942A-200L-M4 only
The Models 942A-200L-M4 is equipped with a Single Channel Analyzer (SCA) function. The SCA
function is provided to permit monitoring of a specific radioactive isotope, as identified by the energy of
the gamma ray emitted as the radioisotope decays. A front panel mounted, alternate action switch is
provided on the front panel to permit Gross or SCA mode operation.
The SCA function is not implemented on the Model 942A-200L-M5 UDR.
Firmware Version
This system requires a PROM for UDR operation. For the part number and the latest revision of the
PROM, see the UDR Factory Test Data Sheet. This Manual has been prepared for use with the P/N
94094217, Rev. 5 or 6, Prom.