Step 2. If the indicating fiber can still be seen to move, clean the charging end of the dosimeter.
Then charge it again. If leakage still is evident after the second charging, the dosimeter is faulty.
Step 3. If leakage is evident when the dosimeter is installed in the charger but not when it is
removed, clean the charging socket thoroughly. Then repeat the charging procedures.
Step 4. If leakage still is evident when the dosimeter is installed in the charger but not when it is
removed, the charger is faulty. However, the charger can still be used if it will charge a dosimeter below
zero. If leakage is evident only when the dosimeter is in the charger, proceed as follows:
(a) Install the dosimeter in the charger. Press down firmly on the dosimeter. Do not tighten the
(b) Turn the charging knob clockwise until the indicating fiber is off-scale left of zero.
(c) Watch the indicating fiber closely. Remove the dosimeter from the charger the instant the
indicating fiber reaches zero on the calibrated scale.
e. Capacitive-jump-occurrence procedures. 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, loosen the chuck
and remove the dosimeter from the charging socket. Then observe the reading on the calibrated scale. If
the indicating fiber has jumped upscale, proceed as follows:
Step 1. Install the dosimeter in the charger. Turn the charging knob clockwise until the indicating
fiber is on the downscale side of zero 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 until a zero reading is obtained after the dosimeter has been removed
from the charger. A zero reading on the dosimeter must be obtained after the dosimeter has been charged
f. After-operation procedures. After the PP-1578/PD charger has been used to charge the
dosimeters, return it to its carrying case in the following manner:
Step 1. Remove the adapter, if used, from the charging socket and place it in the dust cap.
Step 2. Press the assembled adapter and dust cap into the charging socket.
Step 3. Place the assembled charger in its carrying case and fasten the flap.
2-9. Operating Instructions for the PP-1578A/PD Charger. Use the following procedures to correctly
operate the PP-1578A/PD charger:
a. Before-operation procedures. Before the PP-1578A/PD charger can be operated, it must be
prepared as follows:
Step 1. Remove the charger from its carrying case.
Step 2. Unscrew the dust cap and lift it off the charging pedestal.