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Insulation
Resistance
Measurement
4339B
Insulation
Resistance
Measurement
Residual
Charge
Eect
Once
a
high
resistance
insulation
material
is
charged
with
a
voltage
,
a
residual
voltage
will
still
remain
on
the
material
for
a
while
after
the
charging
voltage
is
removed.
When
you
want
to
measure
a
high
resistance
material
after
charging
and
measuring
it
once
,
you
must
wait
long
enough
to
discharge
the
voltage
across
DUT
from
the
previous
measurement
before
making
another
measurement,
or
the
measurement
value
may
be
incorrect.
Absorption
Phenomena
When
a
high
resistance
insulation
material
remains
charged
with
a
voltage
for
a
long
time
,
its
resistance
value
will
increase
.
So
record
the
time
from
which
the
charge
was
applied
to
the
DUT
to
the
start
of
the
measurement.
V
oltage
Coecient
and
T
emperature
Coecient
The
resistance
value
of
an
insulation
material
depends
on
the
measurement
voltage:
the
resistance
value
of
most
insulation
materials
will
increase
as
the
measurement
voltage
increases
.
The
resistance
of
an
insulation
material
depends
on
its
temperature
.
T
o
measure
accurately
,
place
the
DUT
into
an
environmental
test
chamber
to
keep
the
DUT's
temperature
at
a
constant
known
level
when
making
a
measurement.
Record
the
measurement
voltage
and
temperature
when
making
a
measurement.
Shielding
V
ariation
in
total
current
seen
by
the
measurement
circuit
can
be
caused
by
power-line
noise
pickup
,
adjacent
electro-magnetic
elds
of
excessive
strength,
exing
the
test
leads
beyond
reasonable
limits
,
or
by
changing
the
position
of
the
leads
relative
to
their
surroundings
.
Most
noise
problems
of
this
type
are
transient,
and
contribute
more
inconvenience
than
error
.
Any
suitable
enclosure
will
suce
to
reduce
unwanted
noise
pick-up
.
Connect
the
shield
to
the
guard
(ground).
When
using
sensitive
measurement
ranges
,
lead
movement
or
operator
proximity
will
aect
the
stability
of
the
measurement.
Stationary
leads
and
shielding
are
recommended.
7-2
Measurement
Basics
Содержание 4339B
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