Laser Forward Voltage Measurement Calibration - ILX Lightwave LDX-32420 User Manual

Laser Forward Voltage Measurement Calibration

The following procedure is for calibrating the LASER voltage measurement.
Configure the Current Source in the following manner for the Laser Current
Source Voltage calibration:
Function
LASER MODE
RANGE
CURRENT LIMIT
I SETPOINT
This ends the section on front panel calibration of your LDX-32420 Current
Source. The next section discusses calibration through the GPIB/IEEE488
interface.
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C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
g. Release the (PARAMETER) SET switch to accept the second calibration point. After
the (PARAMETER) SET switch is released, the LDX-32420 Series Current Source
will calculate the calibration constants and store them to nonvolatile memory.
a. Connect a resistor in series with the secondary current from the transducer such that
approximately 4V will be developed across the resistor with 10A of current from the
LDX-32420. Connect the voltage sense wires from D-sub on the 32420 and the
voltage sense lines from the voltmeter such that they measure voltage across the
resistor.
b. Press the (MODE) ON switch to turn the current source output on. The current
source output must be on in order to enter the LDV calibration mode.
c. Enter the LASER V calibration mode by pushing the (GPIB) LOCAL and RANGE
switches at the same time. The display will blank and the Current Source will drive
the LASER current output to the respective setpoint and the display will indicate
forward voltage in Volts.
d. Enter the measured voltage (in volts). Press and hold in the (PARAMETER) SET
switch and turn the adjust knob until the display indicates the measured voltage.
e. Once the actual voltage value is entered, the Current Source will set the current to
approximately one-fourth (1/4) of the original value. It will then expect the second
calibration voltage point.
f. Input the second actual (measured) LASER forward voltage as in Step d.
g. Once the second actual voltage value is entered, the Current Source will store the
new calibration constants.
Calibration of the LDX-32420 Current Source
State
I (constant current low bandwidth)
10A
Set to FS (full scale of range)
8A
6
C H A P T E R
77
LDX-32420
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