Newport LDC-3706 Series, User Manual

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December 2019 99 LDC-3706 Series Laser Controller
IC-I (AD590 or equivalent) Sensor Calibration
The following procedure calibrates the IC-I sensor measurement so that the temperature
measurement will be accurate. This procedure does not calibrate C
1
and C
2
. For information
on calibrating the IC-I sensor, see Appendix A.
This procedure uses internal components for its calibration. No external components are
required. Accurate IC-I measurements require that the IC-V, the 100 µA thermistor, and the IC-I
calibration procedures have been performed. The order in which these three procedures are
performed is not important.
For IC-Current sensors used with the LDC-3706 instrument the 4-wire sensor
measurements (pins 7 and 8) should not be connected. The use of the 4-wire
sensor will cause inaccurate sensor measurements.
1. Enter the sensor calibration mode by navigating to the “ICI Cal” selection in the Sensor
Cal area of the Calibration submenu of TEC parameter menu tree.
2. Select the “ICI Cal” selection by pressing the SET button, and then press the TEC button
in order to enable the TEC output. This will initiate an auto-calibration.
3. Wait for the 7-segment display to exit the calibration mode. Once the calibration is
completed, the calibration constants will be stored to the non-volatile memory and the
display will return to its previous state.
IC-V (LM335 or Equivalent) Sensor Calibration
The following procedure calibrates the IC-V sensor measurement so that the temperature
measurement will be accurate. This procedure does not calibrate C
1
and C
2
. For information
on calibrating the IC-V sensor, see Appendix A.
This procedure is also required for the other sensor measurements. It only needs to be done
once.
1. Connect a 5 k Ω (± 5%) metal film resistor and a precision voltmeter in parallel at the
sensor feedback pins of the 15-pin output connector of the LDC-3726 (pins 7 and 8) or
the 25-pin output connector of the LDC-3736/LDC-37620 (pins 14 and 15).
2. Enter the sensor calibration mode by navigating to the “ICV Cal” selection in the Sensor
Cal area of the Calibration submenu of TEC parameter menu tree.
3. Select “ICV Cal” by pressing the SET button, and then press the TEC button in order to
enable the first sensor current.
4. Turn the ADJUST knob until the display indicates the same voltage as shown on the
precision voltmeter.
5. Press the TEC button in order to enable the second sensor current.
6. Turn the ADJUST knob until the display indicates the same voltage as shown on the
precision voltmeter.
7. Press the TEC button and wait for the 7-segment display to exit the calibration mode and
reflect the entered sensor resistance setpoint. Once the calibration is completed, the
calibration constants will be stored to the non-volatile memory and the display will return
to its previous state.