Datasheet
2W
connection
4W
connection
I
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INPUT
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4W
INPUT
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The
GDM-8261A
offers
two
methods,
both
2-wire
and
4-wire,
for
resistance
measurements.
The
2-wire
measurement
is
most
commonly
used
for
resistance
measurement
in
the
range
from
10052
to
10k§2.
Whereas
the
4-wire
connection
is
normally
applied
for
resistance
measurement
at
a
value
lower
than
100Q.
When
applied,
4-wire
measurement
automatically
compensates
the
test
lead
resistance
and
connector
contact
resistance
to
get
an
accurate
measurement
result.
The
GDM-8261A
is
able
to
acquire
and
record
2
~
9999
measurement
readings
for
the
“store”
and
“recall”
functions.
This
allows
an
immediate
observation
ofthe
maximum,
minimum,
average
or
standard
deviation
values
of
all
the
recorded
data
whenever
the
data
acquisition
stops.
The
“Math”
function
ofGDM-8261A
includes
four
mathematical
operations
for
measurements:
MX+B,
1/X,
Percentage
and
Stats.
“MX+B"
multiplies
the
measurement
reading
(X)
by
a
factor
(M)
and
adds/subtracts
an
offset
value
(B)
to
calculate
linear
offsets
or
scales
The
“1/X”
function
divides
1
by
the
measurement
reading
(X),
calculating
the
inverse
ofthe
reading.
The
“Percentage”
function
calculates
the
ratio
ofthe
measured
value
to
a
target
value
using
the
1
9
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lei
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level
1
H-u
following
equation:
(Reading
X
—
Reference)/Reference
x
100%.
The
“Stats”
function
makes
statistical
calculations
continuously
or
by
a
user-defined
measurement
counts.
The
statistical
calculations
include
Maximum,
Minimum,
Average
and
Standard
deviation.
With
these
mathematical
operations,
the
GDM-8261A
makes
complex
measurements
quick
and
easy
without
the
complexity
of
manual
calculations.
G.
TEMPERATURE
MEASUREMENT
Cold
junction
points
Hot
junction
CH
+
\
Material
A
point
C
.
_—PO
CH
—
I
Material
B
4
Extension
, .
wires
-J1
The
GDM-8261A
performs
temperature
measurement
accommodating
popular
thermocouple
types
are
supported
for
temperature
a
wide
range
oftemperature
sensors
ofeither
thermocouples
or
RTD
measurement
on
the
GDM-8261A.
For
RTD
sensors,
the
GDM-8261A
(Resistive
Temperature
Detectors).
For
thermocouples,
the
GDM-8261A
calculates
the
voltage
fluctuation
arisen
from
the
resistance
variation
uses
voltage
measurement
terminals
as
the
thermocouple
input
and
due
to
temperature
change.
Either
front
panel
terminals
or
scanner
calculates
the
temperature
from
the
voltage
fluctuation.
Most
ofthe
card
terminals
can
be
used
as
the
input
for
temperature
sensor.