At 12:41 PM 1/8/2014, Neil N wrote:
>The image showing this device used to measure 'hundreds of Amps' seems
>to show wires that are too small?? Anyhow....

Not at all.  It's using an existing power-carrying wire as a current
shunt ("...use the burden voltages already introduced...).  The meter
is looking at some number of millivolts.  Of course when you're using
an uncalibrated shunt you get uncalibrated results, but it's still
very useful.  And if you happened to have a 400 amp fifty millivolt
shunt handy that would be useful as well.  Using six digits you could
display 0-400 amps with half a milliamp resolution if I haven't
botched the figgers.

The internal ammeter setup has a burden of 0.2 volts at full scale
(10 amps).  My Fluke 189 has a burden of 0.4 volts at the same scale
and I think that's fairly typical of multimeters.

But using the precision voltage mode of this device you could arrange
a shunt with a burden of 5 mV, say.  Sometimes that could be
extremely useful.  Calibrating is a matter of passing a known current
through the shunt and moving the clips from the device sufficient
distance apart that it indicates a convenient voltage.

Yrs,
d