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Simpson 1000 - Rotary Controls

Simpson 1000
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THEORY
OF
OPERATION
Further
checks
are
required
if
it
is
desirable
to
know
which
tube
elements
are
involved
in
the
short
or
leakage.
See
Section
VI,
Special
Applications,
for
further
instructions.
ROTARY
CONTROLS
There
are
four
rotary
controls
on
the
front
panel
of
the
Model
1000.
Figure
1
shows
the
location
of
each
of
these
controls.
The
FILAMENT
switch
is
a
rotary
type
with
24
positions.
Twenty-three
positions
are
marked
for
the
a-
mount
of
voltage
which
the
switch
will
select
from
the
pow-
er
transformer.
These
voltages
include
all
the
values
required
for
the
tube
filaments
of
tubes
which
will
be
tested.
They
range
from
zero
to
117
volts.
The
24th
position
of
the
FILAMENT
switch
is
labelled
''S".
This
switch
position
is
used
when
checking
cold
cathode
tubes
such
as
an
OZ4,
in
which
the
plate
voltage
of
the
Model
1000
is
not
sufficient
to
initiate
conduction
across
the
tube.
The
117
volts
available
from
the
FILAMENT
switch
is
added
in
series
with
the
plate
voltage
of
180
volts
to
furnish
enough
voltage
to
start
con-
duction
in
the
tube.
A
3K
resistor,
added
in
series
with
this
circuit,
is
a
cur-
rent
limiting
resistor
which
protects
the
tube
once
it
starts
to
conduct.
LINE
ADJUSTMENT
CONTROL
The
LINE
ADJUSTMENT
control
is
a
continuously
vari-
able
potentiometer
in
series
with
the
primary
of
the
power
transformer,
The
transformer
is
wound
so
that
it
will
pro-
duce
the
correct
secondary
voltages
when
100
volts
is
28

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