Callendar-Van Dusen (Rtd) Conversion; Setting Coefficients A, B, And C; Setting Coefficients A, B, C, And D - Fluke 1504 User Manual

b=4.6354171E03, c=-1.2531030E05, and d=-6.2365913E06. Set the 1504 pa-
rameters with values from the certificate as follows.
Table 4 Setting Coefficients a, b, c, and d
1504 Coefficient
b0
b1
b2
b3
Example 2:
A thermistor's calibration certificate gives coefficients a=-4.2501569E00,
b=3.8997001E03, and c=-1.4225654E07. Set the 1504 parameters with values
from the certificate as follows.
Table 3 Setting Coefficients a, b, and c
1504 Coefficient
b0
b1
b2
b3
6.4.4

Callendar-Van Dusen (RTD) Conversion

The RTD conversion uses the Callendar-Van Dusen equation:
(
[ ]
r t C
The coefficients R
"r0", "ALPHA", "bEtA", and "dELtA" on the display. For IEC-751 or
DIN-43760 sensors, the coefficients for "r0", "ALPHA", "bEtA", and
"dELtA" should be 100.0, 0.00385, 1.507, and 0.111 respectively.
Some probes may be provided with A, B, and C coefficeints for the
Callendar-Van Dusen equation in the following form:
⎧
⎧
⎡
+ α − δ
⎪
⎨
R 1 t
⎢
0
⎣
⎪ ⎩ 100 100
)
° =
⎨
⎧
⎡
⎪
+ α − δ
⎢
⎨
R 1 t
⎪
0
⎩ ⎪
100 100
⎣
⎩
, α, β , and δ can be set by the user. They are indicated as
0
Selecting the Probe Characterization
Certificate Value
a
b
c
d
Certificate Value
a
b
0
c
⎫
⎤
⎛ ⎞
t t
−
⎜ ⎟
⎬
1
⎥
⎝ ⎠
⎦
⎭
⎛ ⎞ ⎛ ⎞
t t t
− ⎟ − β −
⎜ ⎜ ⎟
1 1
⎝ ⎠ ⎝ ⎠
100
6 General Operation
≥
t 0
⎫
⎤
3
⎛ ⎞
t
<
⎜ ⎟
⎥
⎬
t 0
⎝ ⎠
100
⎦
⎭
21