Simpson 650 - Page 9

GENERAL DESCRIPTION
on the left. Ic has three positions marked PNP—
OFF-NPN. It selects the proper battery polarity
and transistor connections for checking either an
NPN or a PNP type transistor. The battery is
disconnected when the switch is in the OFF posi-
tion to prolong battery life while the Model 650
is not being used.
BETA SWITCH
-The large control on the right is the BETA
switch. It has six positions for selecting the
circuitry necessary for setting up the instrument
for transistor measurements.
260 — 650 SWITCH
The small control at the bottom center of the
front panel is a convenience switch. It permits
use of the Multimeter alone without detaching the
Model 650.
BATTERY-ADJUST CONTROL
This control is located at the top left on the
front panel. It is adjusted for the correct voltage
necessary for optimum accuracy.
ZERO ADJUST CONTROL
This control is a combination potentiometer
and push-pull switch located at the right side on
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