ILX Lightwave LDT-5525 User Manual page 63

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. Allow the LDT-5525 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.
2. Select the C1 parameter. Read and record the value of C1.
3. Place the sensor at an accurately known and stable temperature, T
of the LDT-5525's 15-pin connector. Set the LDT-5525 for normal constant temperature (T mode)
operation. Allow the LDT-5525 Temperature Controller to stabilize at the known temperature, T
read the displayed temperature, T
4. Determine the new value of C1, C1
and replace C1 with C1
.
d
, from the formula:
n
C1 = C1 + T - T
n a d
by selecting the C1 parameter and entering the new C1
n
. Connect the sensor to pins 7 and 8
a
C-5
and
a
value.
n