Fluke Biomedical 451B - Manual (Page 19)

Ion Chamber Survey Meter
Operation
9
Operation
The following sections describe the operation of the Survey Meter.
 Warning
To prevent possible electrical shock, fire, or personal injury, do
not put metal objects into connectors.
External Controls
There are two external controls on the Survey Meter: an ON/OFF button and a
MODE button.
ON/OFF Button
Press the ON/OFF button to turn on the product. All the elements in the display
turn on and the microprocessor runs through an initialization procedure. Part of
the procedure includes reading the calibration coefficients stored in EEPROM. If
an EEPROM read error occurs, an error code (E1) displays at power-on and
unity calibration coefficients are used.
The bar graph and digital display will show a reading that decreases as the
Survey Meter stabilizes. The initial reading usually starts in the 50 R/h
(50 mSv/h) range and decreases through the lower ranges to a reading of less
than 0.5 mR/h (5 µSv/h) within 40 seconds. When the elements in the display
turn off, with the exception of those necessary for normal operation, the user can
begin the measurement process.
Note
Background fluctuations may occur (less than 0.5 mR/h (5 µSv/h))
returning to the original reading typically in less than 3 seconds.
Mode Button
To configure the MODE button to the opposite function without the RS-232
connection, use the following procedure:
1. Turn off the Survey Meter.
2. Press the MODE button.
3. Turn on the Survey Meter while continuing to press the MODE button.
4. Release the MODE button when the display is in the “all elements on”
condition.
5. Use the MODE button to toggle the Survey Meter between the rate mode and
the newly selected Freeze or Integrate mode.