NOTE
Ensure that the DPM display is OFF before pressing the
DEPRESS FOR READING switch or an incorrect reading may
result. The NEUTRON CAL O, NEUTRON CAL 800, or GAMMA CAL
800 controls have no effect on the present DPM reading.
While the DPM display is OFF, make small adjustments.
Press the DEPRESS FOR READING switch and observe the effect
on the DPM. Repeat the sequence as many times as
necessary.
Step 4.
Press and release DEPRESS FOR READING switch (21) and
observe reading on DPM (22), (Figure 5-26).
(1) If reading is between 795 and 805 cGy, proceed to
Step 6.
(2) Refer to the NOTE in Step 2a. If reading is not
between 795 and 805 cGy, use key on carrying case or screwdriver
to adjust NEUTRON CAL 800 control (30) until DPM reading is 800.
Turn control clockwise if reading is too low or counterclockwise
if reading is too high.
NOTE
Perform Step 5 only if the NEUTRON CAL 800 control was
adjusted during Step 4.
Step 5.
Repeat Steps 1 through 4.
Step 6.
Set selector switch (20) to GAMMA CAL 800 position,
(Figure 5-26).
NOTE
During the following procedure, ensure that the drawer
assembly is pulled out of the reader as far as it will go.
Do not touch or apply any pressure to the drawer assembly
during this procedure, or inaccurate readings may result.
Step 7.
Pull out drawer (25), (Figure 5-26), to its full
extent.
WARNING
Ultraviolet light may cause severe and permanent damage to
the eyes. Operate the DEPRESS FOR READING switch only when
the drawer assembly is in the full open or closed position
or exposure to ultraviolet light may result.
IS0345
5-30
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