Two Point Calibration Method - Newport LDC-3706 Series User Manual

Two Point Calibration Method

This procedure will work for any linear IC 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-3706 instrument to warm-up for at least one hour. Set the sensor to the
desired sensor type, and RECALL the constants for the particular device to be
calibrated.
2. Select the C
1
Read and record the value of C
3. Place the sensor at an accurately known and stable temperature, T
sensor to pins 14 and 15 for the LDC-3736 or LDC-37620 25-pin connector or pins 7
and 8 of the LDC-3726 15-pin connector. Set the LDC-3706 instrument to normal
constant temperature (T mode) operation. Allow the LDC-3706 instrument to stabilize
at the known temperature, T
values.
4. Repeat Step 3 for another known temperature, T
temperature, T
operating range. The smaller of the two is intended operating range, the better the
calibration over that same range.
5. Determine the new value of C
First determine the intermediate values U and V, where
Then C and C
1n
6. Replace C with C
1
Replace C with C
2
December 2019
parameter. Read and record the value of C
.
2
and read the displayed temperature, T
a1
. The two known temperatures should at the bounds of the intended
d2
(C
1
=
can be determined by the following:
2n
= + ( ∗ )
by selecting the C
1n
by selecting the C
2n
, and the corresponding displayed
a2
) and C (C ) from the following calculations.
1n 2 2n
= − (
and
= ∗
and
parameter and entering the new C
1
parameter and entering the new C
2
110
. Select the C parameter.
1 2
. Connect the
a1
. Record these
d1
∗ )
1n
2n
LDC-3706 Series Laser Controller
value.
value.