CALIBRATION AND TROUBLESHOOTING
Vol ta ge Li mi t S et po in t
03_10 LDX-36000 Series 129
CHAPTER 6
Voltage Limit Setpoint
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 adjustable voltage source to 0V.
6 Set the 36000 voltage limit to 20% of the max voltage limit with the following command:
LAS:LIM:V limit
- where "limit" is the voltage limit value in volts
7 Slowly increment the voltage on the adjustable voltage source until the voltage limit light is
triggered. Record the voltage at which the voltage limit is triggered.
8 Set the 36000 voltage limit to 80% of the max voltage limit with the following command:
LAS:LIM:V limit
- where "limit" is the voltage limit value in volts
9 Slowly increment the voltage on the adjustable voltage source until the voltage limit light is
triggered. Record the voltage at which the voltage limit is triggered.
10 Calculate the slope and offset of the voltage limit calibration with the following equations:
slope =(80% Voltage Limit Value - 20% Voltage Limit Value) / (36000 80% Trigger Value-
36000 20% Trigger Value )
offset = 80% Voltage Limit Value - ( slope * 36000 80% Trigger Value )
11 Send the voltage limit calibration to the 36000 using the following command:
LAS:CAL:LIMITV slope,offset
12 Set the adjustable voltage source to 0V.
13 Set the 36000 voltage limit to 50% of full scale.
14 Slowly increase the voltage on the adjustable voltage source until the voltage limit light is
triggered.
15 Verify that the voltage limit is triggered within the accuracy specifications of the
instrument.
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