CALIBRATION AND TROUBLESHOOTING
QCW Calibration
03_10 LDX-36000 Series 127
CHAPTER 6
QCW Calibration
1 Set the 36000 output mode to QCW Pulse with the following GPIB command:
LAS:MODE:PULSE
2 Set the QCW current calibration to default values by sending the following command:
LAS:CAL:QCWLDI 1,0
3 Use a shorted output cable to connect the 36000 current output to a high accuracy current
transducer.
4 Set the current limit to the maximum value for the instrument.
5 Set the duty cycle to 1% by using the following command: LAS:DC 0.01
6 Set the pulse width to 1ms by using the following command: LAS:PWP 0.001
7 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
8 Turn the 36000 current output on with the following command: LAS:OUT ON
9 Use the trigger out from the 36000 to trigger a measurement from the current transducer.
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
command: LAS:LDI setpoint
- where "setpoint" is the current value in amps
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:
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 )
14 Send the CW current setpoint calibration to the 36000 using the following command:
LAS:CAL:QCWLDI slope,offsetDacCounts
15 Set the current setpoint to 50% of the maximum value for the instrument with the following
command: LAS:LDI setpoint
- where "setpoint" is the current value in amps
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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