ILX Lightwave LDC-3700B Series - Laser Forward Voltage Measurement Calibration

CALIBRATION AND TROUBLESHOOTING
Calibration Overview
7/01 LDC-3700 Series 121
CHAPTER 5
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one−fourth (1/4) of the original current. (For example, if the first calibration set point was
4000 µA, the second set point will be about 1000 µA.)
6 Press and hold in the (PARAMETER) SET switch and turn the ADJUST knob until the
LASER display indicates the actual current as measured by the ammeter or as calculated.
7 Release the (PARAMETER) SET switch to accept the second calibration point. After the
(PARAMETER) SET switch is released, the LDC−3700B Series Laser Diode Controller
will calculate the calibration constants and store them to nonvolatile memory.
Laser Forward Voltage Measurement Calibration
The following procedure is for calibrating the LASER voltage measurement.
Configure the Controller in the following manner for the Laser Controller Voltage calibration:
1 With the LASER output off, connect a calibrated voltmeter, in parallel with a resistor
(100 Ω, 2 Watt for the LDC−3714B; 15 Ω, 5 Watt for the LDC−3724B or LDC−3744B), to
the LASER output (Laser Anode and Laser Cathode) on the rear panel of the controller.
2 Press the (LASER MODE) ON switch to turn the LASER output on The LASER output
must be on in order to enter the LDV calibration mode.
3 Enter the LASER V calibration mode by pushing the (GPIB) LOCAL and (LASER
DISPLAY) V switches at the same time. The TEC display will blank and the controller will
drive the LASER current output to the respective set point and the LASER display will
indicate forward voltage in Volts.
4 Enter the measured voltage (in volts). Press and hold in the (PARAMETER) SET switch
and turn the ADJUST knob until the LASER display indicates the measured voltage.
5 Once the actual voltage value is entered, the Controller will set the current to
approximately one−fourth (1/4) of the original value. It will then expect the second
calibration voltage point.
6 Input the second actual (measured) LASER forward voltage.
7 Once the second actual voltage value is entered, the Controller stores the new calibration
constants.
Function State
Laser Mode I (constant current low bandwidth)
Range
LDC−3714B
LDC−3724B
LDC−3744B
100 mA
500 mA
2000 mA
Laser Limit set to FS (full scale of range)
I Set Point
LDC−3714B
LDC−3724B
LDC−3744B
60 mA
400 mA
400 mA
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