[volt-nuts] Keithley SourceMeters

[J. Forster]

At a quick glance, the Keithley box looks like an HP 4140 or an earlier
PAR C-V plotter.

These things characterize PN junctions by integrating the current for a
series of voltage steps. The integral of the current.dt is the charge, so
they can work back and figure the capacitance. They effectively measure
the capacitance of the SCL as a function of voltage. Of course the SCL is
a function of the reverse bias on t6he junction.

-John

==================


> Hello Fred,
>
> Regarding your question on Keithley SourceMeters:
>
> Short question, keithley makes source meters, They are in the
> micromeasurements handbook but I can not really place this. It sounds like
> a sort of IV meter, or coulomb meter but for DC. Not planning to buy one,
> just curious.
>
>
> They are basically precision power supplies with precision measurement
> capabilities.  They are frequently used to test VCSELs (a type of laser
> diode) and LEDs.
>
> Here is part of the description from
> <http://www.keithley.com/products/dcac/currentvoltage/gpmp?mn=2400>:
>
> All SourceMeter models provide precision voltage and current sourcing as
> well as measurement capabilities. Each SourceMeter instrument is both a
> highly stable DC power source and a true instrument-grade 6½-digit
> multimeter.
>
> Brent
>
>
>
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