b=4.6354171E03, c=-1.2531030E05, and d=-6.2365913E06. Set the1504 pa-
rameters with valuesfro m the certificateas follows.
Example2:
A thermistor’scalibration certificate gives coefficients a=-4.2501569E00,
b=3.8997001E03, and c=-1.4225654E07. Set the1504 parameters with values
from the certificateas follows.
6.4.4 Callendar-Van Dusen (RTD) Conversion
The RTDconversion uses the Callendar-VanDusen equation:
[]
()rtC
Rt
tt t
Rt
°=
+− −
⎛
⎝
⎜⎞
⎠
⎟
⎡
⎣
⎢⎤
⎦
⎥
⎧
⎨
⎩
⎫
⎬
⎭≥
+
0
0
1100 100 10
1
αδ
α−−
⎛
⎝
⎜⎞
⎠
⎟−−
⎛
⎝
⎜⎞
⎠
⎟⎛
⎝
⎜⎞
⎠
⎟
⎡
⎣
⎢⎤
⎦
⎥
⎧δβ
tt t t
100 100 1100 1100
3
⎨
⎩
⎪
⎫
⎬
⎭
<
⎧
⎨
⎪
⎪
⎩
⎪
⎪t0
The coefficientsR0,α,β,andδcan be set by theuser. They are indicated as
“r0”, “ALPHA”, “bEtA”, and “dELtA” on the display.For IEC-751 or
DIN-43760 sensors, the coefficientsfor “r0”, “ALPHA”, “bEtA”, and
“dELtA” shouldbe 100.0, 0.00385, 1.507, and 0.111 respectively.
Some probes may beprovided with A, B, and C coefficeints for the
Callendar-VanDusen equation in the following form:
21
6 General Operation
Selecting the Probe Characterization
1504Coefficient CertificateValue
b0 a
b1 b
b2 0
b3 c
Table 3 Setting Coefficients a, b, and c
1504Coefficient CertificateValue
b0 a
b1 b
b2 c
b3 d
Table 4 Setting Coefficients a, b, c, and d