CALIBRATION AND TROUBLESHOOTING
Laser Diode Voltage Measurement Calibration
128 LDX-36000 Series
CHAPTER 6
Laser Diode Voltage Measurement Calibration
1 Set the 36000 Display to Voltage by sending the following command: LAS:DIS:V
2 Set the voltage calibration to default values by sending the following command:
LAS:CAL:LDV 1,0
3 Connect an adjustable voltage source to the laser diode voltage sense lines located in the
DB9 on the back panel of the 36000.
4 Connect a DMM to measure the output of the voltage source.
5 Set the voltage source to 20% of the maximum voltage measurement of the instrument.
6 Measure and record the voltage output with the DMM.
7 Measure and record the voltage with the 36000 by sending the following command:
LAS:LDV?
8 Set the voltage source to 80% of the maximum voltage measurement of the instrument.
9 Measure and record the voltage output with the DMM.
10 Measure and record the voltage with the 36000 by sending the following command:
LAS:LDV?
11 Calculate the slope and offset of the voltage measurement with the following equations:
slope =(DMM 80% measurement - DMM 20% measurement ) / (36000 80%
measurement - 36000 20% measurement )
offset = DMM 80% measurement - ( slope * 36000 80% measurement )
12 Send the voltage measurement calibration to the 36000 using the following command:
LAS:CAL:LDV slope,offset
13 Set the voltage on the voltage source to 50% of the full scale voltage measurement.
14 Measure and record the voltage with the 36000 by sending the following command:
LAS:LDV?
15 Verify that the voltage measurement is within the accuracy specifications of the
instrument.
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