Fluke Biomedical 945A - Manual (Page 35)

Power Up Procedure
To place the system in operation, the following steps should be performed:
1. Verify that the UDR FUNCTION switch, located on the front right section of the UDR main board, is in
a position other than 8 or 9.
2. Verify that SW3-3 on the 977 interface board, located in the preamplifier enclosure, is set to the OFF
position.
3. Verify that the detector, preamplifier, and UDR are properly connected.
4. Apply power to the system. If all connections are good, the UDR will come up in the Rate Mode.
NOTE
The appearance of error codes E0002 or E0008 may indicate that the
setpoint memory has not been initialized. To initialize the set point
memory to the default values, power-up the UDR with the ENTER button
held down. (The UDR must be pulled out from its mounting to access the
ENTER button).
The appearance of error code E0007 indicates a communication failure.
Verify communication wiring, jumper and switch settings (refer to tables 4-
3 and 4-5). Also check the communications board set-up using the
instruction manual provided in Appendix A.
When the system is first powered up, the preamplifier will detect a high
dose rate and pass this data to the UDR. This is the result of currents
generated by turning on the high voltage to the detector, and takes several
minutes to stabilize. The Overrange, High, and Warn alarms are inhibited
for three minutes after power-up. The analog outputs are at low scale
during this period.
5. Channel dependent set points, such as alarm limits, are to be entered using the procedure described
later in this section. The UDR contains default values for all setpoints to permit power-up prior to
user defined values being entered.
6. Electronic adjustments affecting calibration are factory set and should not be readjusted for initial
operation unless the UDR has been in storage for more than one (1) year. If the unit been in storage
for more than one (1) year, the electronic calibration described in section 5 should be performed.
How to Enter Setpoints
Available setpoints are listed in Table 4-2. The setpoints are accessed using the FUNCTION switch, the
DIGIT button, the VALUE button, and the ENTER button. These are located on the main printed circuit of
the UDR. The UDR must be pulled about halfway out of its rack chassis in order to access them. The
buttons are on the right side of the main board about two inches behind the front panel. The FUNCTION
switch is on the right side directly in front of the power supply.
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