Keithley 2520, Service Manual, Page: 59 / 137

Model 2520 Pulsed Laser Diode Test System Service Manual Calibration 2-29
13. Enable slow pulses:
:SOUR1:PULS:TRAN:STAT ON
14. Repeat steps 5 through 12.
15. Send this command to turn off the output:
:OUTP1 OFF
16. Disconnect the 100
Ω
resistor, then connect the 10
Ω
resistor in its place.
17. Repeat steps 3 through 15 for the 5A range with the following changes:
• Select the 5A range:
:SOUR1:CURR:RANG 5
• Use these commands to set the two low current values:
:SOUR1:CURR:LOW 0.15
:SOUR1:CURR:LOW 0.015
• Use 900µA and 750µA respectively as the offsets when calculating the
:CAL:PROT:SOUR1:LOW parameter.
Table 2-11
Remote pulse low calibration summary
Current range Calibration resistance
1
Calibration commands
N/A :SOUR1:FUNC:SHAP PULS
500mA 100
Ω
:OUTP1 ON
:SOUR1:PULS:TRAN:STAT OFF | ON
2
:SOUR1:CURR:RANG 0.5
:SOUR1:CURR:LOW 15e-3
:CAL:PROT:SOUR1:LOW <C 90
μ
A>
:SOUR1:CURR:LOW 1.5e-3
:CAL:PROT:SOUR1:LOW <Current - 75
μ
A>
:OUTP1 OFF
5A 10
Ω
:OUTP1 ON
:SOUR1:PULS:TRAN:STAT OFF | ON
2
:SOUR1:CURR:RANG 5
:SOUR1:CURR:LOW 150e-3
:CAL:PROT:SOUR1:LOW <C 900
μ
A>
:SOUR1:CURR:LOW 15e-3
:CAL:PROT:SOUR1:LOW <Current - 750
μ
A>
:OUTP1 OFF
1. Use actual resistance values when calculating currents.
2. Repeat steps for both fast and slow pulses. See procedure.