I Pd Current Calibration - ILX Lightwave LDX-3200 Series User Manual

h. Press and hold in the (PARAMETER) SET switch and turn the adjust knob until the display indicates the
actual current as calculated in step g.
i. Release the (PARAMETER) SET switch to accept the second calibration point. After the (PARAMETER)
SET switch is released, the Current Source will calculate the calibration constants and store them to
nonvolatile memory. In low bandwidth calibration mode, the LDX-3200 Series Current Source will also
perform current limit calibration, indicated by the CURRENT LIMIT LED flashing.
j. Turn the current source output off. Change the Mode to I
Repeat the calibration procedure as described above.
k. Change the output range to High range and repeat the calibration procedure as described above.
I Current Calibration
PD
The following procedure is for calibrating the LASER I
procedure calibrates the feedback circuits for constant I
and are stable, the user enters the actual value of the monitor current, measured with a DMM. The LDX-3200 Series
Current Source then automatically calibrates the LASER feedback circuits.
Configure the Current Source in the following manner for the Laser Current Source calibration:
FUNCTION
MODE
CAL PD
CURRENT LIMIT
I Set POINT
PD
a. With the LASER output off, connect a calibrated ammeter to the PD Anode output of the Laser Current
Source output connector (9 pin on rear panel), and connect the circuit of Figure 6.1 to the LASER and PD
outputs with the correct load resistor for the Current Source model you are calibrating (See Table 6.2).
If a precision ammeter is not available, use a zero-Ohm jumper in place of the ammeter. Then,
place a calibrated DMM (with 0.1 mV resolution) to measure the voltage across the resistor, R1,
as shown in Figure 6.1. Calculate the current in the following steps by 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 pd current to be measured by the LDX-3200 Current
Source. (A 4-point probe resistance measurement is recommended.)
CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE
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(high bandwidth constant current mode).
HBW
(photodiode monitor) set point and measurement. This
PD
and constant P
PD PD
STATE
P (constant power)
set equal to zero
90% of FS (full scale of range)
80% of FS
NOTE
I = E / R
PAGE 4
modes. When these values are reached
CHPT 6