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Simpson 1000 - Toggle Switches

Simpson 1000
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THEORY
OF
OPERATION
The
amount
of
bias
voltage
across
the
entire
potentiometer
depends
on
the
position
of
toggle
switch
K.
The
voltage
which
will
be
used
as
bias
for
testing
the
tube
is
connect-
ed
to
one
section
of
the
LINE
TEST
switch;
it
is
not
fur-
nished
to
the
tube
circuit
until
the
LINE
TEST
switch
is
pushed
later.
RANGE
CONTROL
The
RANGE
control
at
the
lower
right
hand
corner
of
the
front
panel
is
a
continuously
variable
potentiometer
which
is
in
series
with
the
meter
circuit
and
is
a
vernier
adjust-
ment
of
the
meter
sensitivity.
The
settings
shown
on
the
chart
are
based
on
experimental
results,
and
cause
the
meter
to
indicate
a
percent
of
Plate
Conductance
present
in
each
of
a
group
of
sample
tubes
corresponding
to
the
percent
of
Mutual
Conductance
with
the
same
tube
indi-
cated
under
controlled
laboratory
conditions.
TOGGLE
SWITCHES
There
are
twelve
toggle
switches
across
the
bottom
of
the
front
panel,
and
these
are
identified
with
letters
(A
through
L).
Each
switch
except
K
has
six
positions
(0
through
5).
Switches
A
through
J
are
single
section
switches
which
connect
socket
terminals
to
the
proper
voltage
sources
for
the
tube
which
is
to
be
tested.
In
the
0
position,
each
switch
contacts
ground;
in
the
1
position
it
contacts
fila-
ment
voltage;
in
the
2
position
it
contacts
screen
voltage;
in
the
3
position
it
contacts
plate
voltage;
in
the
4
posi-
tion
it
contacts
grid
bias
voltage;
and
in
the
5
position
it
furnishes
an
open
circuit.
30

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