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Uncertainty
PT12
Manual
7/20/2021
Page
46
of
48
UNCERTAINTY
The
PT12
is
a
versatile
12
probe
PRT
temperature
measurement
device
accurate
to
within
±
0.0003
Ω
over
a
customizable
range.
In
a
Characterization
with
a
PT12
optimized
for
100
Ω
PRTs,
the
maximum
observed
uncertainty
was
within
±
0.0003
Ω
for
values
under
180
Ω
.
The
PT12
was
characterized
using
calibrated
precision
resistors,
and
uncertainty
was
calculated
for
each
channel
using
the
following
equation:
Where
Δ
is
the
deviation
of
the
average
indicated
value
from
the
characterized
reference
value
applied,
σ
is
the
standard
deviation
of
the
indicated
values,
and
R
u
is
the
uncertainty
of
the
reference
resistances
applied
during
the
characterization.
The
following
table
contains
the
mean
and
maximum
channel
uncertainties
observed:
Resistance
(
Ω
)
Maximum
Channel
Uncertainty
(
Ω
)
Average
Channel
Uncertainty
(
Ω
)
5.00015752
0.000316876
0.0002589
25.001911
0.000363353
0.0002798
60.0049527
0.000189909
0.0001655
100.005241
0.000342708
0.0002393
140.004765
0.000358613
0.0003045
180.007329
0.000576929
0.0004342
230.009409
0.001355477
0.0009165
280.006798
0.001577576
0.0011847
340.024239
0.002671505
0.0015240
400.022006
0.003768707
0.0022801