Lightwave Communications LDX-3232 manual Laser Forward Voltage Measurement Calibration, Laser Mode

C H A P T E R 6

CALIBRATION AND TR OU BLESHOOTING

Local Calibration of the LDX-3232 Current Source

g.Release the (PARAMETER) SET switch to accept the second calibration point. After the (PARAMETER) SET switch is released, the LDX-3232 Series Current Source 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 Current Source in the following manner for the Laser Current

Source Voltage calibration:

Function	State
LASER MODE	I (constant current low bandwidth)
RANGE	2000 mA
CURRENT LIMIT	Set to FS (full scale of range)
I SETPOINT	800 mA

a.With the current source 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.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.

This ends the section on front panel calibration of your LDX-3232 Current Source. The next section discusses calibration through the GPIB/IEEE488 interface.

94 LDX-3232