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Simpson 1000 - Page 6

Simpson 1000
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GENERAL
DESCRIPTION
The
control
settings
which
you
make
according
to
the
chart
were
established
experimentally
for
each
tube
so
the
read-
ing
of
each
tube
in
a
sample
group
indicates
the
proper
evaluation
for
that
tube.
The
percentage
of
Plate
Conduct-
ance
indicated
on
the
meters
of
several
Tube
Testers
Model
1000
are
made
to
agree
with
the
percent
of
rated
Mutual
Conductance
measured
on
each
sample
tube
with
a
laboratory
type
Mutual
Conductance
Bridge.
This
correla-
tion
assures
you
of.proper
indications
for
evaluating
all
tubes
according
to
standard
rating
systems
when
you
test
them
on
your
Simpson
Tube
Tester
Model
1900.
FAST
TESTING
Shorts
and
leakage
resistance
are
conditions
which
may
develop
in
a
tube
during
its
life
and
may
contribute
trouble
to
the
circuits
in
which
the
tube
is
used.
The
Model
1000
has
a
circuit
which
measures
the
amount
of
leakage
resist-
ance
between
adjacent
tube
elements
of
the
tube
under
test.
The
sequence
of
operations
in
which
a
tube
is
tested
pro-
vides
you
with
this
information
before
you
apply
operating
voltages
to
the
tube
elements
(except
the
filament),
and
prevents
you
from
damaging
your
tube
tester
by
connecting
voltage
across
a
short
or
a
low-resistance
circuit.
If
there
are
any
paths
for
inter-element
leakage
resistance
within
the
tube,
the
amount
of
resistance
in
the
leakage
is
shown
on
the
OHMS
scale
of
the
meter.
To
speed
the
test,
enough
elements
are
separated
from
all
the
others
to
assure
all
the
necessary
tests
for
each
tube,
but
unnecessary
extra
checks
are
eliminated.
In
a
diode,
for
instance
only
one
short
test
is
required;
the
cathode
is
separated
from
the
rest
of
the
tube
elements,
and
the
ohmmeter
will
in-
4

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