KEYPAD
IN/OUT
SWITCH.
when testing on dry circuits. The
Located on the keypad bezel OUT position must be used when the
(see Figure
2),
this white rocker circuit voltage is
6V
or less, such as
switch selects either of two operating when using "tones" or other test
modes. When set to the IN position, devices as a source of talk battery.
the Test Set operates as a modern
electronic telephone set. This mode
is used for all normal communication
functions. The OUT position bypasses
the Test Set electronics, including the
keypad. In this mode signaling is not
possible, but the Test Set will operate
at very low voltages, much like stan-
dard test sets currently in use. Line
testing is possible in either switch
position. The OUT position is recom-
mended when testing at or near the
loop limit
(1
500
R
@
48
VDC)
or
8
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