NOTE
In the
conductance range, there
is normally a small
residual reading
with open test
leads. To
ensure
accurate measurements, connect
clean test leads to
the meter and (with
the leads open) read the
residual
leakage in nanosiemens.
Correct subse-
quent
measurements by using the Relative mode
(REL) to 2ero the display, which subtracts
the
residual
from
the
readings.
Diode
leakage tests require that the
diode junction
be
reverse-
biased when being
measured.
To do
this,
connect the
anode
of
the diode to
the
COM input
terminal and
the
cathode (ring) of
thediodetothe VQ-»+-
input terminal. Leakage
at
the test
volt-
age being applied can
then
be
read in terms of
conductance.
High-voltage,
stacked diode,
assemblies
can
usually be tested
for
forward
and reverse resistance
changes using conduc-
tance. These
assemblies typically have such
high
forward volt-
age drops
that the diode test or resistance
modes
cannot test
them.
Noisy
Resistance Measurements
Your Fluke meter
is
designed
to
tolerate up to
several volts of
ac
noise. Noise appears as changing numbers
on the digital
display
and as an oscillating analog
display. Changing
the
APPLICATIONS
Measuring Capacitance
range
may reduce
the
noise. To smooth out
the
effect of
noise
on
your readings, enter the
MIN MAX
Recording
mode and
scroll
to the
average reading.
Measuring
Capacitance
CAUTION
Turn
off
power
and
discharge
the capacitor
before attempting
a
capacitance
measurement.
Use the
(
V
)
function to confirm
that the capaci-
tor
is
discharged.
The
meter measures capacitance by
charging
the
capacitor
with
a known
current, measuring the
resultant voltage,
and
calculating the
capacitance. The measurement takes
about 1
second per
range
(push button responses
also
take
about 1
second).
The capacitor charge can
be up
to 1.2V.
For measuring
capacitor values
up
to 5.8/uF, turn the rotary
switch to
'Win
-it-,
press
the BLUE
button,
and connect the
test
leads
to
the capacitor.
The meter will select
the proper
range
automatically. Each
measurement
takes about 1
second per
range. Wh
en making
repeated measurements of
similar values, press
QwqQ
to
manually select the
proper
range and
to speed
up
subsequent
measurements.
For
capacitors less than
5
nF
or
in
noisy environments,
use
short
test
leads
or
a
test fixture
(1
nF
-
1000
pF).
21
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