Laser Forward Voltage Measurement Calibration - ILX Lightwave LDX-3200 Series User Manual

b. Press the (MODE) ON switch to turn the current source output on. Verify proper operation, i.e. the I
measurement (via DMM) and set point should be close, and the unit should not be in current limit.
c. Press the (GPIB) LOCAL and FINE switches at the same time to place the Current Source in its I
Calibration mode.
After a few seconds the display will show the I
d. After the value on the display is stable (has not changed by more than one digit for several seconds) the
LDX-3200 Series Current Source is ready for the actual I
Press and hold in the (PARAMETER) SET switch and turn the adjust knob until the display shows the
actual monitor current, as shown on the calibrated ammeter (or the calculated I
e. Release the (PARAMETER) SET switch to store the first calibration value. The Current Source will then set
the second calibration current, approximately 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.)
f. Press and hold in the (PARAMETER) SET switch and turn the adjust knob until the display indicates the
actual current as measured by the ammeter or as calculated.
g. Release the (PARAMETER) SET switch to accept the second calibration point. After the (PARAMETER)
SET switch is released, the LDX-3200 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
LASER MODE
RANGE
LDX-3210
LDX-3220
CURRENT LIMIT
I SET POINT
LDX-3210
LDX-3220
a. With the current source output off, connect a calibrated voltmeter, in parallel with a resistor (100 Ω, 2 Watt
for the LDX-3210; 15 Ω, 5 Watt for the LDX-3220), 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.
CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE
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set point value.
PD
value to be entered.
PD
STATE
I (constant current low bandwidth)
100 mA
500 mA
set to FS (full scale of range)
60 mA
400 mA
PAGE 5
PD
Current
PD
value from Step a).
PD
CHPT 6