Applications; Circuit Loading Error - Fluke 8010A Instruction Manual

Figure 2-8.
Conductance
Operation
6.
Select the resistance function.
The
overrange
indicator
should appear
in
the
display.
7.
Set the instrument
to
the
2000
range and
short
the
test
leads.
The
display
should read
"00.0".
8.
Select the
S=l/0
(conductance)
function, 2
mS
range.
The
display
should read ".000"
±
5
counts.
9.
Short
the
test
leads.
The
overrange
indicator
should appear
in
the
display.
10.
This concludes the
Initial
Checkout
procedure
for
your
Multimeter.
If
the performance
of
the
instrument
is
in
question
refer to
the
Performance
tests in
Section 4 of
this
manual.
2-39,
APPLICATIONS
2-40.
The
following
paragraphs contain
additional
information
and measurement
techniques
for the
five
primary functions of your Multimeter.
NECT THE
COMMON
INPUT
TERMINAL TO
ANY SOURCE OF MORE THAN
500
VOLTS
DC OR PEAK AC ABOVE EARTH GROUND.
2-41.
Circuit
Loading
Error (Voltage)
2-42. Circuit
loading
errors occur
when
voltage
measurements
are taken
on
high
impedance
circuits.
This
is
because
the
Multimeter
loads the source, thus changing
the operating voltage of the source.
As
long
as the
circuit
impedance
.(source
impedance)
is
low compared
to the
input
impedance
of the
Multimeter
this
error
may
be
insignificant.
For
example,
when
measuring
a
circuit
with
a source
impedance
of
10
kH
or
less,
the error
will
be
^
0.
%.
If
the circuit
loading
error
is
significant,
use the
appropriate
formula
contained
in
Figure
2-1 0 to calculate
the
percentage of
error.
WARNING
OPERATOR
INJURY
AND INSTRUMENT
DAMAGE MAY
RESULT
IF
THE BACKUP
FUSE
(F2)
BLOWS WHEN CURRENT
IS
BEING
MEASURED FROM A VOLTAGE OF
GREATER THAN
600
VOLTS.
2-8
WARNING
TO
AVOID ELECTRICAL
SHOCK
AND/OR
INSTRUMENT DAMAGE,
DO NOT
CON-