Figure 40. Transformer, Power, Isolation and Step-Down TF-248/G, schematic diagram.

S802 is placed at the 120V position, and

p o w e r cord plug P801 is connected to a

nominal 115-volt power source. Under

t h i s condition, the two primary windings

o f the power transformer are connected

in parallel, as shown in B, figure 40. Fuse

F 8 0 1 protects the equipment from over-

load. The secondary output of transformer

T 8 0 1 is filtered by capacitors C801 and

C 8 0 2 (A, fig. 40). The filtered nominal

115-volt output is available at front-panel

r e c e p t a c l e J801 for connection through

C a b l e Assembly, Power, Electrical CX-

6 6 8 0 / U to the main unit POWER recep-

tacle.

b . 240V Position of S802.

When the

available power source for the test set is

2 2 0 - 2 5 0 - v o l t s , 50-400-cps, the external

transformer f u n c t i o n s as a stepdown

transformer. Setting the 120V-240V switch

to the 240V position connects the two pri-

Figure 39. Cable Assembly, Special Purpose,

mary windings of power transformer T801

Electrical Brunched CX-6681/URM-85,

i n series, as shown in C, figure 40. The

schematic diagram.

i n p u t voltage is reduced by a two-to-one

r a d i o , a n d a nominal 115-volt output,

transformer is used to supply the test set

f i l t e r e d by capacitors C801 and C802,

with an isolated source of power 110-125 -

i s available at receptacle J801 for ener-

Volts , 5 0 - 4 0 0 - c p s when its front-panel

gizing the test set.

switch S801 is placed at the ON position,

Figure 40. Transformer, Power, Isolation and Step-Down TF-248/G, schematic diagram.