Re: How to measure Pulse Current?

Jim Yanik wrote:
"GSiu" <gomansiu@xxxxxxxxxxxxxx> wrote in news:1152403202.776179.267640@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:


Is there any suggestion how to measure Pulse current up to 10KA and
pulse wide below 10mA?




below 10ma,a clip-on P6021,P6022(AC)current probe,or a TM500/AM503/A6302 system,DC-50 Mhz BW. The AM503/A6303 probe measures high currents (IIRC,up to 100's of A),but not 10,000A.

you may need some sort of current transformer for those really high currents.

*All* of those probes are current transformers...
At 10,000 amps one would have a problem in preventing saturation; the secondary winding resistance probably cause enough IR drop that the current would be low enough so that the current (amps) times turns (= ampere-turns) would reflect back to the primary (of one turn) so that the net core flux would be excessive.
Now, it might be done with a *large* core and (relatively) large diameter wire (to reduce that IR drop)...
So, start with a turns ratio of (say) 10,000 to 1, meaning the secondary has 10,000 turns.
For insignificant IR drop, the secondary should be no smaller than #20.
From that, figure out the cross-sectional area taken for 10,000 wires, thenmathematically "spread" it out over a torus (if that is the shape of the core) or rectangle (if "C" or "E" type core).
That should give you a rough idea as to the minimum core size (will need to be larger due to insulation, etc).
.