Receiver-Transmitter Check and Adjustment

TM 9-1240-369-34

every 5,000 rangings. In addition, whenever there is a

2-6. Receiver-Transmitter Check and Adjustment.

requirement that the receiver-transmitter unit or the

power supply control unit be replaced or repaired, the

CAUTION

PFN current must be adjusted to produce the proper

Adjustment tool inserted into PFN

transmitter energy. The R/T tester and the PFN charge

ADJ access port shall be of an

ammeter check the transmitter energy, receiver

electrically insulating material to

sensitivity, and the PFN current.

The following

prevent

possible

damage

procedure is to be performed by securing the tester

equipment

resulting

from

tool

adapter and R/T tester to the receiver-transmitter unit

contacting exposed voltage point.

and interconnecting the PFN charge ammeter, and R/T

Excessive transmitter energy density

tester to the power supply control unit.

may damage the coating on the

b. PFN Adjustment Procedure.

The following

receiver-transmitter

unit

optical

procedure is used to prepare the R/T tester for use (fig.

elements.

2-6).

a. General. The transmitter energy, which may be

altered by adjusting the PFN current, is to be checked

Figure 2-6. R/T tester installation.

2-9