a.
Install the dosimeter in the charger.
Press down
firmly on the dosimeter.
b.
Turn the charging knob clockwise until the indicating
fiber is off scale to left of 0.
c.
Watch the indicating fiber closely. Remove the
dosimeter from the charger the instant the indicating
fiber reaches 0 on the calibrated scale.
d.
If necessary, repeat steps a through c above until a
zero reading is obtained after the dosimeter is
removed from the charger.
d. Procedures When a Capacitive Jump Occurs.
On some dosimeters, particularly low-range instruments, an
instantaneous partial discharge may occur as the dosimeter is removed
from the charger. This partial discharge is called a capacitive jump.
After the dosimeter has been charged, move the dosimeter from the
charging pedestal; then observe the reading on the reticle scale. If
the indicating fiber has jumped up scale, proceed as follows:
Step 1.
Place the charging end of the dosimeter over the
charging pedestal. Turn the charging knob clockwise
until the indicating fiber is on the down-scale side
of 0 by an amount equal to the capacitive jump.
Step 2.
Remove the dosimeter from the charger and observe the
reading.
Step 3.
Repeat Steps 1 and 2 above until you obtain a zero
reading. You must sustain a zero reading on the
dosimeter after it has been charged and checked.
e. After Operation Procedures.
After you use a PP-1578A/PD Charger, replace it in its carrying case
as follows:
Step 1.
Unscrew the adapter (if used) from the charging
pedestal and place the adapter in the adapter
container in the carrying case.
Step 2.
Screw the dust cover into place over the charging
pedestal.
5-11
IS0345
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