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3-16
DC Current Source Operation
Programming example
The following programming example shows a typical command sequence to con-
figure and control the DC output:
CLEar
CURRent:RANGe:AUTO ON
CURRent 12e-3
CURRent:COMPliance 10
OUTPut ON
OUTPut OFF
Applications
Some applications for the Model 622x are summarized below. See Appendix E of
the Reference Manual for details on these applications.
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•
•
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Calibration source – Explains how to use Model 622x as a current calibra-
tion source. The custom sweep function allows a user-defined list of current
source values to be stored in memory. During the calibration process, each
current source level is output in the order that it appears in the list.
Resistivity measurements – Certain semiconductor materials such as sili-
con have high resistivities. The Model 622x can be used to source stable
and accurate current, and the Keithley 6514 Electrometer can be used to
provide an accurate voltage measurement. Resistivity is then calculated.
Diode characterization – With the Model 622x and Keithley 6514 Elec-
trometer, it is possible to plot I-V (current-voltage) characteristics of a diode
over several decades. The Model 6514, with its high input resistance, will
allow the voltage measurement to be accurately made.
Transistor characterization – The Model 622x can be used with a Kei-
thley 24xx SourceMeter to characterize a device's electrical DC parame-
ters. The Model 622x Current Source is configured to sweep a number of
base currents for the test. The Model 24xx SourceMeter is configured to
sweep voltage and measure current.
External user-supplied filter – Based on load impedance and response
time requirements, a user-supplied filter can be effective at reducing high
frequency noise generated by the Model 622x current source.
Compliance overshoot prevention – Depending on range and load
impedance, step changes in current could cause the output voltage to
briefly overshoot its set compliance level by as much as 2V and take sev-
eral microseconds to settle. A few microseconds of overshoot could be
enough to damage voltage sensitive devices.
Return to
Model 6220/6221 User's Manual
' Turns the output off.
' Enables autorange.
' Sets output level to +12mA.
' Sets voltage compliance to 10V.
' Turns the output on.
' Turns the output off.
Section 3 topics
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