Hi Ed:
> > I am looking to source a DC current probe to measure
> >steady state as well as inrush currents for a modular chassis
> >up to 100 Amps DC.
.
.
.
> Do you REALLY need a current probe? Can't you do this with a resistive
shunt
> and an oscilloscope, using either differential inputs or simply floating
the
> scope?
Inrush current is not an easy measurement.
In addition to a suitable current measuring
device, the source impedance is critical as well
as the control of the turn-on (which should be
something like 80 degrees to get maximum inrush
current).
Depending on the magnitude of the inrush current,
a resistive shunt may significantly reduce the
inrush current. In general, a resistive shunt
should not be used for measuring inrush currents.
Tektronix makes a high-current version of their
dc current probe that easily makes the inrush
current measurement. This current probe at
least assures an accurate measurement so that
one can concentrate one's efforts on the source
impedance and switching.
Best regards,
Rich
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