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NOLLOHS
SECTION
II
INITIAL
CHECKS
2.1
INTRODUCTION
The
following
procedure
is
provided
to
facilitate initial
performance
checking
of
the
Model 113.
In
general,
the
procedure
should be performed
after
inspecting
the
instru-
ment
for shipping damage (any
noted
to
be reported
to
the
carrier and
to
Princeton Applied Research
Corporation),
but
before using
it
experimentally. Should
any
difficulty be
encountered
in carrying
out
these checks,
contact
the
factory
or
one
of
its representatives.
2.2 EQUIPMENT NEEDED
(1) General
purpose
laboratory oscilloscope.
(2) Signal
generator
capable
of
providing a 1 V pk-pk
sinewave
at
1 Hz,
100
Hz, and 1 kHz.
2.3 PROCEDURE
(1) Make sure
the
rear-panel slide switch
is
in
the
position
indicating
the
line voltage
to
be used
(115
V ac
or
220
Vac).
(2) Plug
the
line
cord
into
the
rear
of
the
instrument
and
into
the
power receptacle.
(3) Press
the
power switch so
that
it remains depressed.
(4) Push
the
spring-loaded
battery
test
toggle
to
the
left,
then
push
it
to
the
right.
The
green indicator should
light for
both
positions.
(5) Make
the
following initial
control
settings:
(a) Gain:
x10;
Cal.: fully counterclockwise
(turn
until
the
switch
"clicks").
11-1
(b) Coupling: A
input
AC, B
input
GND.
(c) Low
Frequency
Rolloff
control:
1 Hz.
(d) High
Frequency
Rolloff
control:
1 kHz.
(6)
Connect
the
oscilloscope
to
the
output
BNC jack_
(7)
Set
the
signal
generator
to
1 Hz, 1 V pk-pk, and
connect
it
to
the
A
input
BNC jack. (Use
the
oscilloscope
to
make
the
signal
generator
amplitude
settings,
to
obtain
consistency
between
input
settings
and
output
readings.)
(8) Monitor
the
output;
the
output
level should be 7 V
pk-pk.
(9)
Set
the
signal
generator
to
100
Hz, 1 V pk-pk.
Monitor
the
output;
the
output
level should be
ten
times
the
input
level.
(10)
Set
the
signal
generator
to
1 kHz, 1 V pk-pk.
Monitor
the
output;
the
output
level should be 7 V pk-pk.
(11) Press
the
OVL
recovery
button;
the
output
should
decrease
to
a low level, typically
50
mV. However,
the
absolute signal
amplitude
can vary considerably
from
unit
to
unit.
(12) Return
the
power
switch
to
the
OFF
(out) position.
This completes
the
initial checks. If
the
instrument
per-
formed
as
indicated,
one
can be reasonably sure
that
it
is
operating properly.
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