Power Supply.

during the LR transmitter test.

The adapter cable assembly (ACA)(figure 1-9, item 4) is used to

connect DC power to the LR while testing, and provides an electro-

magnetic interference (EMI) blocking device.

Ground terminal E11

(figure 1-9, item 11) provides for a unit ground connection.

2.

Power Supply.

The LR Tester requires a 115 VAC power source.

External power is

supplied through the AC power cable assembly (figure 1-9, item 2) to

the PWR jack J1 (figure 1-9, item 26). Power is applied through the

ON/TRIPPED OFF circuit breaker CB1 (figure 1-9, item 23) and lights

the PWR ON indicator DS1 (figure 1-9, item 25).

The 115 VAC is

applied across the primary of T1 (figure 1-11, item 6) through line

filters FL1 and FL2 (figure 1-9, items 11 and 12). The secondary of

T1 provides 115 VAC and 12.6 VAC to the power supply board assembly

A3 (figure 1-11, item 24).

The power supply board assembly A3 has two separate power supplies

contained within, one for the receiver and one for the transmitter:



Receiver Power Supply - The receiver power supply receives the

12.6 VAC, and through a bridge rectifier and a series

regulator, provides a regulated +5 VDC to the voltage divider

circuits.

The voltage divider allows for fine adjustment of



Transmitter Power Supply - The transmitter power supply

receives the 115 VAC, and through a bridge rectifier and a

transistorized series regulator, provides regulated 100 VDC to

a voltage divider circuit.

This voltage divider allows the

output voltage to be set between +66 and +100 VDC for fine

adjustment of the transmitter output power.

3.

Transmitter/Receiver.

The transmitter/receiver assembly A1 (figure 1-11, item 9) is made up

of an optics housing assembly, an oven assembly, and a Xmt/Rcv board

assembly, A1A1.

17

OD1716