Fluke Biomedical 956A-201-M2 - Manual (Page 76)

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If a question arises on the use of the field calibrator or the
adapter, refer to the applicable instruction manual for the
calibrator or adapter.
By using two field calibrators in three positions each (open,
closed, and intermediate) a total of six different exposure levels
can be obtained
1. To use the test source, determine the current radiation intensity for the closed, intermediate, and open
positions from the decay curves on the field calibrators. Determine upper and lower tolerance limits by
taking 75% and 125% of each intensity level.
Do not turn the key of the field calibrator, until instructed to do so.
Failure to comply may result in radiation exposure to the
operator.
2. Insert the applicable adapters into the field test source.
3. Insert the applicable 897A detector, small end down, into the field source adapter.
4. Insert the key, DO NOT turn.
5. Record the displayed value (this is the CLOSED position).
To put the field calibrator in the open position, the detector must
be installed in the calibrator. Insert the key and turn it. Rotate
the hand knob fully. The detector is fully exposed to the radiation
source. This is the OPEN position.
To put the field calibrator in the intermediate position, start from
the closed position and hold a counter-clock-wise pressure on the
key while rotating the knob to the open position. A stop will be
felt before the open position is reached. This is the Intermediate
Position.
6. Turn the key, and rotate the control lever until the Intermediate position stop is felt. Record the
reading.
The detector cannot be removed until the field calibrator is put
back to the closed position and the key is removed.
7. Turn the control lever to the full counter-clockwise, or OPEN position. Record the reading.
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