4-14
PID Control Concepts
Models 2510 and 2510-AT User’s Manual
Sensor coefficients
Thermistor coefficients
The thermistor sensor coefficients A, B, and C linearize the thermistor temperature-
resistance curve and are related using the Steinhart and Hart equation as follows:
Where:
T = Temperature (K)
R = Thermistor resistance (ohms)
A, B, C = Thermistor sensor coefficients
These coefficients should be set to values specified by the thermistor manufacturer. See
“Configuring temperature,” page 3-3
, for programming details.
RTD coefficients
In a similar manner, RTD sensor coefficients
α
,
β
, and
δ
linearize the RTD temperature-
resistance curve using the Callendar-Van Dusen equation in the following manner:
Where:
R
T
= Resistance at temperature T (°C).
R
0
= Resistance at temperature 0°C.
α
= Temperature coefficient at 0°C (typically 0.00392
Ω
/°C).
δ
= 1.49 (typical for 0.00392 platinum RTD).
β
= 0 for T >0°; 0.11 (typical) for T<0°.
These coefficients should be set to values specified by the RTD manufacturer. See
“Configuring temperature,” page 3-3
, for programming details.
1
T
---
A
B
1nR
[
]
C
1nR
[
]
3
+
+
=
R
T
R
0
R
0
α
T
δ
–
T
100
---------
1
–
T
100
---------
β
T
100
---------
1
–
T
100
---------
3
–
+
=
Summary of Contents for TEC SourceMeter 2510
Page 194: ...A Specifications...
Page 197: ...B StatusandErrorMessages...
Page 206: ...C IEEE 488BusOverview...
Page 221: ...D IEEE 488andSCPI ConformanceInformation...
Page 225: ...E ExamplePrograms...
Page 233: ...F GPIB488 1Protocol...
