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Table 3.
Controls and Indicator (Cont'd)
COMPONENT
DC BIAS:
switch
(S201)
EXTERNAL HI, LO, and J_
binding posts
INTERNAL ADJUST control
(R201)
INTERNAL MONITOR
E and
binding posts
INTERNAL MONITOR
jack
(J 201)
Power switch
(S401)
DESCRIPTION - FUNCTION
Four-position rotary switch used to select
the following bias voltages:
+INT:
Internal bias up to +150 volts.
OFF:
Disables internal bias supply.
-INT:
Internal bias up to -6 volts.
EXT:
Disables internal bias supply and
connects the bridge to the
EXTERNAL binding posts.
Used to connect external bias (up to 400V
at 100 mA, maximum).
A jumper is installed
between the LO and ground terminals for
2-terminal bias applications.
The jumper is
removed for 3-terminal bias applications to
permit independent biasing at the HI and LO
posts.
The EXTERNAL HI, LO, and ground
binding posts are dc extensions of the
corresponding TEST and REMOTE TEST
terminals on the front panel.
Variable resistor.
The 10-revolution
control knob adjusts internal bias levels
from -6V to +150V when the DC BIAS switch
is in the +INT or -INT position.
Terminals used to connect a dc volt-meter
for metering internal bias voltage.
Normal-through jack with make-before¬
break contacts; used to connect a meter for
measuring internal bias current.
Toggle switch.
Controls the application of
ac power to the instrument.
75D
b-370
20
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