CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE CHPT 6
PAGE 5
b. Press the (MODE) ON switch to turn the current source output on. Verify proper operation, i.e. the I
PD
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
PD
Current
Calibration mode.
After a few seconds the display will show the I
PD
set point value.
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
PD
value to be entered.
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
PD
value from Step a).
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
A, the second set point will be about 1000
A.)
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 STATE
LASER MODE I (constant current low bandwidth)
RANGE
LDX-3210
LDX-3220
100 mA
500 mA
CURRENT LIMIT set to FS (full scale of range)
I SET POINT
LDX-3210
LDX-3220
60 mA
400 mA
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.
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