Fluke Biomedical 942A-200L-M4 - Manual (Page 56)

942A-200L-M4 & 942A-200L-M5 UDR
Operator Manual
3-16
To enter a parameter, the FUNCTION switch is set to the desired position and the following steps are
performed:
NOTE
In the event it is necessary to re-enter all of the default
setpoints, the UDR EPROM memory may be reinitialized
by turning the UDR power off, then depressing the
ENTER pushbutton at the same time the power on
switch is depressed. The ENTER push button should be
held until the left most digit on the display is flashing.
1. Press the ENTER pushbutton. The current value of the parameter, selected by the FUNCTION
switch will be displayed on the front panel. The leftmost digit of the value will be flashing. The
value is displayed in the format shown below:
M.MMEN
This format expresses the form of M.MM x EN, where M is a whole number from 0 to 9, E
designates a positive or negative exponent, and N represents the exponent value from 0 to 9. A
negative exponent is expressed as a minus (-) character in the E position.
2. The value of the flashing digit can be incremented by pressing the VALUE pushbutton.
3. The flashing digit can be moved one place to the right by pressing the DIGIT pushbutton.
4. When the desired value has been entered into the display, pressing the ENTER pushbutton causes
the displayed value to be entered into memory for permanent storage. The new parameter value is
now effective.
3.12 Set Point Descriptions
High Alarm Limit (Switch Position 0)
This parameter is entered in units of CPM in the exponential format described above. The high alarm
limit set point can be set to any value desired. When the display value exceeds this limit, the UDR will go
into a HIGH alarm state. The HIGH alarm limit must be greater than or equal to the WARN alarm and the
underrange limit. It must be less than or equal to the overrange limit.
Warn Alarm Limit (Switch Position 1)
This parameter is entered in units of CPM in the exponential format described above. The warn alarm
limit set point can be set to any value desired, but must be lower than the high alarm limit set point.
When the displayed value exceeds this limit. The UDR will go into a WARN alarm state. The WARN
alarm limit must be greater than or equal to the low scale value and less than or equal to the HIGH alarm
limit.
Rate Alarm Limit - Not Implemented
Resolving Time (Tau Switch Position 2)
This parameter is entered in units of minutes per count. The actual value to be entered is a function of
the individual detector and is supplied with the detector calibration data sheet. If a complete system is
installed, this setpoint is factory entered.
Analog Full Scale Value (Switch Position 3)
This value is the dose rate at which the analog output is 10 volts or 20 milliamperes. This value must be
an even power of 10 that is at least 1 decade higher than the analog low scale value. An even power of
10 is a number of the form 1.00EX, where X equals -9 to +9. This parameter is entered in units of CPM
and sets the upper value of the analog outputs. This value must be set to exact decade values.
Example: 1.00E4 is acceptable, 2.00E4 is not.