Current Source Calibration - ILX Lightwave LDX-3200 Series User Manual

Current Source Calibration

The following procedure is for calibrating each range of the current source. Calibration must be performed on both
bandwidth modes. A total of four calibrations will be performed on the current source. Start with the low range, low
bandwidth mode.
Configure the Laser Current Source in the following state:
FUNCTION
MODE
RANGE
CURRENT LIMIT
SET POINT
a. Measure and record the resistance of a 1 Ω, 20 W resistor (a 4-point probe resistance measurement is
recommended). Connect the load resistor across the LASER output terminals (Laser Anode and Laser
Cathode) on the 9 pin connector of the rear panel.
b. Connect the calibrated DMM across the load resistor. Configure the multimeter to measure voltage in volts.
You will be calculating the actual Laser current in the following manner using Ohm's Law.
--where E is the accurately measured voltage across the resistor, and R is the accurately measured load
resistance. I is the actual Laser current in Amps.
Check the current measuring range of your multimeter. You may be able to measure Laser Output
current in mA by connecting the meter directly to the outputs of the Laser Current Source.
c. Press the (MODE) ON switch to turn the current source output on. The output must be on in order to enter
the LASER I calibration mode.
d. Enter the LASER I calibration mode by pushing the (GPIB) LOCAL and (DISPLAY) SELECT switches at
the same time. The display will blank and the Current Source will drive the current output to the set point
and the Display will indicate output current in mA.
e. Calculate the actual current through the load as described in step b. Press and hold in the (PARAMETER)
SET switch and turn the adjust knob until the display indicates the calculated actual current.
f. Release the (PARAMETER) SET switch. After the (PARAMETER) SET switch is released, the Current
Source will drive the current output to about 25% of the first calibration set point.
g. Calculate the measured current again through the load resistor.
CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE
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STATE
I (constant current low bandwidth)
low (lowest per instrument model)
90% of FS (full scale of range)
80% of FS
I = E / R
NOTE
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