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-3700 Series 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. Select the
C2
parameter. Read and record
the value of C2.
3.
Place the sensor at
an
accurately known and stable temperature, Tal. Connect
the
sensor to the TEC
module of the LDC-3700 Series Laser Diode Controller for normal Constant temperature operation.
Allow the LDC-3700 Series Laser Diode Controller to stabilize at the known temperature, T,, and
read the displayed temperature,
T,,.
Record these values.
1.
Repeat Step 3 for another known temperature,
T,,
and the corresponding displayed temperature, T,.
The two known temperatures should at the bounds of the intended operating range. For best results,
make the range between
T,,
and T, as narrow as possible.
5.
Determine the new value of C1 (Cl,,) and C2 (C2J from the following calculations.
First determine the intermediate
values
U
and
V,
where
V
=
(T,,
-
T,)
/
(Tdl
-
T,), and
U
=
Ta,
-
(T,,
*
V)
Then C
1,
and C2, can be determined by the following:
6.
Replace
C1
with C1,
by
selecting the C1 papameter and entering the new C1, value. Replace C2 with
C2, by
selecting the C2 parameter and entering the new C2, value.
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