Fluke Biomedical 956A-201-M2 - Manual (Page 34)

3-8
If the count rate is below the range limit of the paragraph, the
bargraph will be blanked. When an input signal is present, the
bargraph will illuminate in red as a result to the unacknowledged
alarm condition resulting from actuating the Test Function.
• HIGH Alarm relay changes state (energize)
• WARN Alarm relay changes state (energize)
• Aux Relay changes state (energize)
• Fail relay changes state (energize)
• High and Warn LEDs are illuminated, flashing
The Trip Test Function takes precedence over the automatic alarm
reset option, and the ACK pushbutton, in the next step, must be
pressed to clear the alarm LED’s and bargraph.
• Fail, Range, and Check Source LEDs are turned off and return to normal
• Analog Outputs return to normal
Press and release the ACK pushbutton
• No Change, display shows current value
• No Change, mR/h backlight is illuminated
• Bargraph will return to normal, displaying actual count rate
• No Change, HIGH Alarm relay
• No Change, WARN Alarm relay
• No Change, Aux Relay
• No Change, Fail relay
• High and Warn LEDs are off, and return to normal operation
• No Change, Fail, Range, and Check Source LEDs return to normal
• No Change, Analog Outputs return to normal
3.5 ALARMS
The alarm functions provided by the UDR include HIGH, WARN, FAIL, and RANGE. The HIGH, WARN,
and FAIL alarms drive relay contact outputs. Some operating modes of the UDR disable alarms. The user
is cautioned to read and fully understand section 3.
Alarm Logic Types
Alarm logic defines whether the alarm is reset manually or automatically and whether alarm relay coils are
energized or de-energized in normal operation.
Standard alarm reset logic for the UDR is manual reset for the HIGH and WARN alarms, and auto reset for
the RANGE and FAIL alarm. Fail-safe operation is also standard.
NOTE
NOTE