Fluke Biomedical 956A-201-M2 - Manual (Page 43)

3-17
Setpoint 6
Not used.
Analog Low Scale Value, Setpoint 7
This value is the dose rate at which the analog output is set to low scale (i.e. 0 volt or 4 mA). This value
must be an even power of 10 that is at least one (1) decade lower than the analog full-scale value. An
even power of 10 is a number of the form 1.00EX, where E indicates a positive exponent and a (-) sign
indicates a negative exponent, and X equals a number between 0 and 9. This parameter is entered in
units of mR/h and sets the lower range of the analog outputs. This value must be set to exact decade
values. Example: 1.00E-1 is acceptable, 2.00E-1 is not. A setpoint that is other than 1.0 will not be
accepted by the UDR. If the analog Low Scale value is equal to the High Scale Value, Error Code E0008
is displayed. If the Low Scale Value is higher than the High Scale Value, the setpoint is not accepted.
Calibrate Mode, Setpoint 8
This function permits use of the UDR as a scaler, by entering a fixed counting time, and displaying the
integrated counts during this period. The units are entered in seconds.
Underrange Limit, Setpoint 9
This setpoint is normally set to the low range limit of the detector used, and is entered in mR/h. The
underrange limit must be less than or equal to the HIGH and WARN limits. Note the radiation display will
be 0.00 for dose rates under the underrange limit. When the measured radiation value is less than this
value, the unit goes into a RANGE alarm state.
3.10 SETPOINT ERROR CODES
If, after entering a setpoint or upon power-up, an error code is displayed, it may be due to incorrect
setpoints. Refer to Table 3-5 for a listing of error codes.
Code E0001 indicates that the display value is negative. Usually this means that the setpoint PROM is bad
or needs to be initialized. To initialize the setpoint memory to the default values, power up the UDR with
the ENTER button held down. If initializing the setpoint memory does not help, then the setpoint PROM is
defective or there is a hardware malfunction.
Code E0007 indicates that the specific function is not implemented, and that no setpoint may be entered.
E0007 may be cleared by pressing the ENTER pushbutton, and then rotating the function switch to
another position.
Code E0004 will be displayed when the HIGH is less than the WARN set point, or the WARN is greater
than the HIGH set point. No error message will be displayed when the WARN is equal to the HIGH or the
HIGH is equal to the WARN set point. E0004 is also displayed when the OVERRANGE set point is set
lower than the HIGH alarm set point.
Code E0004 also indicates that the analog output setpoints are invalid. When the analog Full Scale or
Low Scale are set equal to each other, E0004 is displayed. E0004 will also be displayed when the analog
full scale is set lower than the low scale, or the analog low scale is set higher than the full-scale value.
When an Invalid setpoint is entered, the UDR will temporarily accept the value entered, and then apply the
validity check. If a valid set point is entered, the new set point will be accepted. If an invalid setpoint is
identified, E0004 will be displayed. Error Code E0004 will be displayed for approximately four (4)
seconds, and will automatically clear itself, returning to the normal radiation value display mode. To return
to the set point entry mode, the ENTER pushbutton must be pressed again.