Kusam-meco M3500A, Operation Manual, Page: 63 / 158

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PT3916 0.003916 0.11600 1.50594 100 Ω
NTCT 0.003850 0.10863 1.49990 100 Ω
Table 4-3
Here is the temperature equation that is used to determine the RTD
temperature:
When
C t
°
<
0
:
( )
[ ]
100 1
3 2
0
− + + + =
t Ct Bt At R R
t
When
C t C
° < < °
630 0
:
( )
2
0
1 Bt At R R
t
+ + =
Where:
⎟
⎠
⎞
⎜
⎝
⎛ +
=
100
1
δ
α
A
4
10
− ⋅ − =
αδ
B
8
10
− ⋅ − =
αβ
C
If you are using SPRTD(Standard Platinum RTD), select SPRTD and
specify the seven coefficients under SPRTD submenu.
The ITS (International Temperature Scale) -90 standard provides two
reference equations for Standard Platinum Thermometers covering
temperature range from 18.8033K to 1234.93K. However, one SPRTD
usually cannot cover the entire range, so the temperature range is
broken up into a few subranges. These subranges depend on the
calibration point of temperature scale and are based on the melting or
triple points of various pure substances. For an exact list of the elements
needed and details on RTD calibration, refer to NIST Technical Note 1265
“Guidelines For Realizing the International Temperature Scale of 1990”.
In each subrange, the calibration constants required for that subrange
are listed.
Default
The default sensor type in M3500A is PT100.