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C
C H A P T E R
One Point Calibration Method
This procedure will work for any linear temperature sensor. The accuracy of this
procedure depends on the accuracy of the known temperature, externally
measured. It is used to determine the zero offset of the device, and it assumes
that the gain offset (slope) is known and is correct.
1
2
3
4
Two Point Calibration Method
This procedure will work for any linear temperature sensor. The accuracy of this
procedure depends on the accuracy of the known temperatures, externally
measured. It is used to determine the zero offset of the device and the gain offset
(slope).
1
2
3
4
5
54
LDT-5500B Series
Allow the LDT-5500B Series Temperature Controller to warm up for at least one hour. Set
the SENSOR SELECT switch for the desired sensor type, and RECALL the constants for
the particular device to be calibrated.
Select the C1 parameter. Read and record the value of C1.
Place the sensor at an accurately known and stable temperature, T
to pins 7 and 8 of the LDT-5500B Series's 15-pin connector. Set the LDT-5500B Series for
normal constant temperature (T mode) operation. Allow the LDT-5500B Series
Temperature Controller to stabilize at the known temperature, T
temperature, T
.
d
Determine the new value of C1, C1
C1
= C1 + T
- T
d
n
a
and replace C1 with C1
by selecting the C1 parameter and entering the new C1
n
Allow the LDT-5500B Series Temperature Controller to warm up for at least one hour. Set
the SENSOR SELECT switch for the desired sensor type, and RECALL the constants for
the particular device to be calibrated.
Select the C1 parameter. Read and record the value of C1. Select the C2 parameter.
Read and record the value of C2.
Place the sensor at an accurately known and stable temperature, Ta1. Connect the
sensor to pins 7 and 8 of the LDT-5500B Series's 15-pin connector. Set the LDT-5500B
Series for normal constant temperature (T mode) operation. Allow the LDT-5500B Series
Temperature Controller to stabilize at the known temperature, Ta1 and read the displayed
temperature, T
. Record these values.
d1
Repeat Step 3 for another known temperature, T
.
temperature, T
d2
The two known temperatures should at the bounds of the intended operating range. The
smaller the intended operating range, the better the calibration over that same range.
Determine the new value of C1 (C1
First determine the intermediate values U and V, where
, from the formula:
n
, and the corresponding displayed
a2
) and C2 (C2
) from the following calculations.
n
n
. Connect the sensor
a
and read the displayed
a
value.
n
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