CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE CHPT 6
PAGE 9
f. Input the second actual (measured) monitor diode current (as an <nrf value>) as in Step d.
g. Once the second actual I
PD
value is entered via the "LAS:MDI" command, the new calibration constants will
be calculated and stored into non-volatile memory. The "OPC?" query may be used (after the "LAS:MDI"
value is sent) to determine when the calibration is completed. Or, wait about 2 seconds before continuing
with other GPIB commands.
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 GPIB COMMAND
LASER MODE I (constant current low bandwidth) LAS:MODE:ILBW
RANGE
LDX-3210
LDX-3220
100 mA
500 mA
LAS:RANGE 1
LAS:RANGE 5
CURRENT LIMIT set to FS (full scale of range) LAS:LIM:Ix
I Set POINT
LDX-3210
LDX-3220
60 mA
400 mA
LAS:LDI 60
LAS:LDI 400
a. With the LASER output off, connect a calibrated voltmeter, in parallel with a resistor (100 Ω, 2 Watt resistor
for the LDX-3210; 15 Ω, 5 Watt resistor for the LDX-3220), to the LASER output (Laser Anode and Laser
Cathode) on the rear panel of the Current Source.
b. The current source output must be on in order to enter the LDV calibration mode. Enter the "LAS:OUT ON"
command to turn the current source output on.
c. Enter the "LAS:CAL:LDV" command to place the Current Source in its LASER Voltage Calibration mode.
d. Enter the measured voltage (in volts) via the "LAS:LDV <nrf value>" command. The measured value of the
voltage should not be entered until the LDX-3200 Series Current Source is ready to receive it. The current
source will be ready to receive the voltage value when, after a "LAS:CAL:LDV?" query is sent, the response
from the Current Source is "1".
e. Once the actual voltage value is entered via the "LAS:LDV <nrf value>" command, 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 an <nrf value>) as in Step d.
g. Once the second actual voltage value is entered via the "LAS:LDV" command, the Current Source will store
the new calibration constants. The "OPC?" query may be used (after the "LAS:LDV" value is sent) to
determine when the calibration is completed. Or, wait about 2 seconds before continuing with other GPIB
commands.
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