Qcw Calibration - ILX Lightwave LDX-36000 Series User Manual

QCW Calibration

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10 Record the value of current measured by the current transducer.
11 Set the current setpoint to 80% of the maximum value for the instrument with the following
12 Record the value of current measured by the current transducer.
13 Calculate the slope and offset of the CW current setpoint with the following equations:
14 Send the CW current setpoint calibration to the 36000 using the following command:
15 Set the current setpoint to 50% of the maximum value for the instrument with the following
16 Record the value of current measured by the current transducer.
17 Verify that the current setpoint is within the accuracy specifications of the instrument.
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C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Set the 36000 output mode to QCW Pulse with the following GPIB command:
LAS:MODE:PULSE
Set the QCW current calibration to default values by sending the following command:
LAS:CAL:QCWLDI 1,0
Use a shorted output cable to connect the 36000 current output to a high accuracy current
transducer.
Set the current limit to the maximum value for the instrument.
Set the duty cycle to 1% by using the following command: LAS:DC 0.01
Set the pulse width to 1ms by using the following command: LAS:PWP 0.001
Set the current setpoint to 20% of the maximum value for the instrument with the following
command: LAS:LDI setpoint
- where "setpoint" is the current value in amps
Turn the 36000 current output on with the following command: LAS:OUT ON
Use the trigger out from the 36000 to trigger a measurement from the current transducer.
command: LAS:LDI setpoint
- where "setpoint" is the current value in amps
slope = ( 36000 80% setpoint - 36000 20% setpoint ) / ( Transducer 80% measurement -
Transducer 20% measurement )
offsetAmps = 36000 80% setpoint - ( slope * Transducer 80% measurement )
Convert the offset in terms of amps to offset in terms of DAC counts.
offsetDacCounts = 65,535 / ( 1.1 * MAX QCW CURRENT )
LAS:CAL:QCWLDI slope,offsetDacCounts
command: LAS:LDI setpoint
- where "setpoint" is the current value in amps
QCW Calibration
LDX-36000 Series
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C H A P T E R
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