Calibrated Thermistors; Using The Analog Output - ILX Lightwave LDT-5412 User Manual

Calibrated Thermistors

We offer pre-calibrated thermistors (ILX Model 5001) for use with the Steinhart-
Hart equation or tabular R-T conversion. Table 5.2 shows some of the data which
is supplied with the Model 5001 Calibrated Thermistor. With this data, either direct
R-T conversion from the table or through use of the Steinhart-Hart constants and
S-H equation is possible.
Table 2.2 Typical R/T Data with ILX Thermistor
10.0
10.5
11.0
11.5
12.0
12.5
13.0

Using the ANALOG OUTPUT

The measured resistance value (analog) of the thermistor is available at the rear
panel BNC connector (ANALOG OUTPUT) in the form of a reference voltage. The
value of this signal is 1 V = 10 Kohms when the 100 uA THERMISTOR
CURRENT is selected, or 1 V = 100 Kohms when 10 uA is selected. The
ANALOG OUTPUT voltage is linear with resistance, and has a 0 - 2 V range.
When the ANALOG OUTPUT signal is connected to a calculator or meter with
external control signal capability and memory to store a conversion formula (such
as the Steinhart-Hart equation), the resistance can be converted to temperature
directly.
05_11
C1 = 1.111E-3; C2 = 2.355E-4; C3 = 0.900E-7
Temperature in C
20038.55
19567.99
19109.85
18663.78
18229.43
17806.45
17394.52
O P E R A T I O N
Temperature from Resistance
Resistance in Ohms
2
C H A P T E R
13
LDT-5412
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