One Point Calibration Method
186 LDC-3900 Series
CHAPTER B

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 LDC-3900 Laser Diode 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, Ta. Connect
the sensor to pins 7 and 8 of the LDC-3900's 15-pin connector. Set the LDC-
3900 for normal constant temperature (T mode) operation. Allow the LDC-3900
to stabilize at the known temperature, T
a
and read the displayed temperature, T
d
.
4 Determine the new value of C1, C1n, from the formula:
C1
n
= C1 + T
a
- T
d
and replace C1 with C1n by selecting the C1 parameter and entering the new C1n value.
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 Allow the LDC-3900 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. Select the C2
parameter. Read and record the value of C2.
3 Place the sensor at an accurately known and stable temperature, Ta1. Connect
the sensor to pins 7 and 8 of the LDC-3900's 15-pin connector. Set the LDC-
3900 for normal constant temperature (T mode) operation. Allow the LDC-3900
to stabilize at the known temperature, T
a1
and read the displayed temperature,
T
d1
. Record these values.
4 Repeat Step 3 for another known temperature, T
a2
, and the corresponding
displayed temperature, T
d2
.
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