Callendar-Van Dusen Conversion - Fluke 1560 Black Stack User Manual

1560 Thermometer Readout
User's Guide
5.2.1.5
38

Callendar-Van Dusen Conversion

EDIT SPRT 01
PROBE SER#: 1
CONVERSION: CVD
R0: 100.0
ALPHA: 0.00385
DELTA: 1.507
BETA: 0.111
The following equations are used for the Callendar-Van Dusen conversion:
⎧
⎧
⎡
+ α
⎨
⎪ R 1
⎢
0
⎣
⎪ ⎩
° =
⎨
r t C ( [ ])
⎧
⎡
⎪
⎪
+ α
⎨
R 1 ⎢
⎪
0
⎩ ⎪
⎣
⎩
The user-defined parameters for the Callendar-Van Dusen conversion are R0
(R ), ALPHA (α), DELTA (δ), and BETA (β). The defaults are R0: 100.0,
0
ALPHA: 0.00385055, DELTA: 1.4998, and BETA: 0.109 which are applicable
with DIN-43760 or IEC-751 type RTDs.
Some probes may be provided with A, B, and C coefficients for the
Callendar-Van-Dusen equation in the following form:
(
⎧
+
⎪
R 1 At
° = 0
⎨
r t ( [ C ])
[
+
⎩ ⎪
R 1 At
0
The A, B, and C coefficients can be converted to α, δ, and β coefficients using
the following formulas:
α = + δ = −
A 100 B
⎫
⎤
⎛ ⎞
t t
− δ −
⎜ ⎟
⎬
t 1
⎥
⎝ ⎠
⎦
100 100 ⎭
⎛ ⎞ ⎛
t t
− δ − ⎟ − β
⎜ ⎜
t 1
⎝ ⎠ ⎝
100 100 100
)
+
2
B t
]
( )
+ + −
2 3
Bt C t 100 t t
100 10
β = −
+
A
A
+
1
100 B
≥
t 0
⎫
⎤
3
⎞ ⎛ ⎞ ⎪
t t
− ≤
⎟ ⎜ ⎟
⎬
1 ⎥ t 0
⎠ ⎝ ⎠
⎭ ⎪
100
⎦
≥
0
≤
0
8
C
100 B