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CALIBRATION AND TROUBLESHOOTING
Remote Calibration of the LDX-3232 Current Source
98 LDX-3232
CHAPTER 6
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:
a. With the LASER output off, connect a calibrated voltmeter, in parallel with a resistor
(15 Ω, 5 W), to the LASER output (Laser Anode and Laser Cathode) on the rear
panel of the Current Source.
b. The current source output must be on in order to enter the LDV calibration mode.
Enter the LAS:OUT ON command to turn the current source output on.
c. Enter the LAS:CAL:LDV command to place the Current Source in its LASER Voltage
Calibration mode.
d. Enter the measured voltage (in volts) via the LAS:LDV <nrf value> command.
The measured value of the voltage should not be entered until the LDX-3232 Current
Source is ready to receive it. The current source will be ready to receive the voltage
value when, after a LAS:CAL:LDV? query is sent, the response from the Current
Source is "1".
e. Once the actual voltage value is entered via the LAS:LDV <nrf value> command,
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 an <nrf value>)
as in Step d.
g. Once the second actual voltage value is entered via the LAS:LDV command, the
Current Source will store the new calibration constants. The OPC? query may be
used (after the LAS:LDV value is sent) to determine when the calibration is
completed. Or, wait about two seconds before continuing with other GPIB
commands.
Function State GPIB Command
LASER MODE I (constant current low bandwidth) LAS:MODE:ILBW
RANGE 2000 mA LAS:RANGE1
CURRENT LIMIT Set to FS (full scale of range) LAS:LIM:Ix
I SETPOINT 400 mA LAS:LDI 400