CALIBRATION AND TROUBLESHOOTING
Calibration Overview
7/01 LDC-3700 Series 117
CHAPTER 5
LM335 Sensor Calibration
The following procedure is for calibrating the LM335 sensor so that the temperature measurement is
as accurate as possible.
1 Set the SENSOR SELECT switch (back panel) to the LM335 position, the TEC display
code is −−03.
2 Connect a precision 6.8 kΩ (metal film) resistor and the multimeter in parallel to the
sensor input of the Temperature Controller 15 pin connector on the rear panel, Sensor +
and Sensor − terminals. Configure the multimeter to measure voltage in mV.
3 Enter the TEC sensor calibration mode by pushing the (GPIB) LOCAL and (TEC
DISPLAY) R switches at the same time. The sensor code (SENSOR SELECT switch
position) value will be displayed for two seconds. After this, the TEC display will indicate
sensor reference voltage in mV (not enunciated).
4 Press and hold in the (PARAMETER) SET switch and turn the ADJUST knob until the
TEC display indicates the same voltage as shown on the multimeter.
5 Release the (PARAMETER) SET switch to store the new value into non−volatile memory.
After the SET switch is released, the LDC−3700B Series Laser Diode Controller will return
to its former state (before calibration).
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