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How to measure Pulse Current?
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gomansiu@mintformer.com
electronics forum beginner


Joined: 08 Jul 2006
Posts: 5

PostPosted: Sun Jul 09, 2006 12:00 am    Post subject: How to measure Pulse Current? Reply with quote

Is there any suggestion how to measure Pulse current up to 10KA and
pulse wide below 10mA?
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Jim Yanik
electronics forum Guru


Joined: 01 May 2005
Posts: 635

PostPosted: Sun Jul 09, 2006 12:43 am    Post subject: Re: How to measure Pulse Current? Reply with quote

"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:

Quote:
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.

--
Jim Yanik
jyanik
at
kua.net
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Robert Baer
electronics forum Guru


Joined: 25 Mar 2005
Posts: 1159

PostPosted: Sun Jul 09, 2006 8:50 am    Post subject: Re: How to measure Pulse Current? Reply with quote

Jim Yanik wrote:
Quote:
"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:


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).
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Jim Yanik
electronics forum Guru


Joined: 01 May 2005
Posts: 635

PostPosted: Sun Jul 09, 2006 5:13 pm    Post subject: Re: How to measure Pulse Current? Reply with quote

Robert Baer <robertbaer@earthlink.net> wrote in
news:4r3sg.2197$vO.1611@newsread4.news.pas.earthlink.net:

Quote:
Jim Yanik wrote:
"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:


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...

The AM503 probes are Hall-effect devices -with- a current transformer for
hi-freq response.
And they still are PROBES(based on transformers,yes.)
,not a stand-alone transformer.

They also can be slipped over a conductor and not have to be hard-wired
into the circuit.

--
Jim Yanik
jyanik
at
kua.net
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Jamie
electronics forum Guru


Joined: 24 Mar 2005
Posts: 597

PostPosted: Sun Jul 09, 2006 7:34 pm    Post subject: Re: How to measure Pulse Current? Reply with quote

GSiu wrote:

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

CT..

Current Transformer.
you simply pass the load through
it., the terminals give you a ratio..
something like a 500:1 comes to mind.
also there is the concern of the pulse
width time your looking for ?
also you have Tranducers that can convert
to 4..20, voltage or digitial output etc..


--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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Robert Baer
electronics forum Guru


Joined: 25 Mar 2005
Posts: 1159

PostPosted: Mon Jul 10, 2006 1:21 am    Post subject: Re: How to measure Pulse Current? Reply with quote

Jim Yanik wrote:

Quote:
Robert Baer <robertbaer@earthlink.net> wrote in
news:4r3sg.2197$vO.1611@newsread4.news.pas.earthlink.net:


Jim Yanik wrote:

"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:



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...


The AM503 probes are Hall-effect devices -with- a current transformer for
hi-freq response.
And they still are PROBES(based on transformers,yes.)
,not a stand-alone transformer.

They also can be slipped over a conductor and not have to be hard-wired
into the circuit.

I believe this is the first time that "stand-alone" was mentioned...
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John McMillan
electronics forum beginner


Joined: 20 May 2005
Posts: 9

PostPosted: Mon Jul 10, 2006 1:40 pm    Post subject: Re: How to measure Pulse Current? Reply with quote

In article <UYhsg.6490$cd3.4642@newsread3.news.pas.earthlink.net>,
Robert Baer <robertbaer@earthlink.net> wrote:

Quote:
Jim Yanik wrote:

Robert Baer <robertbaer@earthlink.net> wrote in
news:4r3sg.2197$vO.1611@newsread4.news.pas.earthlink.net:


Jim Yanik wrote:

"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:



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

Rogowski coil?
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Robert Baer
electronics forum Guru


Joined: 25 Mar 2005
Posts: 1159

PostPosted: Mon Jul 10, 2006 8:59 pm    Post subject: Re: How to measure Pulse Current? Reply with quote

John McMillan wrote:

Quote:
In article <UYhsg.6490$cd3.4642@newsread3.news.pas.earthlink.net>,
Robert Baer <robertbaer@earthlink.net> wrote:


Jim Yanik wrote:


Robert Baer <robertbaer@earthlink.net> wrote in
news:4r3sg.2197$vO.1611@newsread4.news.pas.earthlink.net:



Jim Yanik wrote:


"GSiu" <gomansiu@mintformer.com> wrote in
news:1152403202.776179.267640@p79g2000cwp.googlegroups.com:




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


Rogowski coil?
Wow! Used Google to find out what that was, and the first hit, the

PDF is very illuminating and useful.
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John McMillan
electronics forum beginner


Joined: 20 May 2005
Posts: 9

PostPosted: Fri Jul 14, 2006 2:36 pm    Post subject: Re: How to measure Pulse Current? Reply with quote

In article <yczsg.5621$PE1.2098@newsread2.news.pas.earthlink.net>,
Robert Baer <robertbaer@earthlink.net> wrote:

Quote:
John McMillan wrote:



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


Rogowski coil?
Wow! Used Google to find out what that was, and the first hit, the
PDF is very illuminating and useful.

I had a summer job at Culham lab years back and we used to make
these things out of stripped Hackethal delay cable. I don't
suppose you can still get Hackethal or anything like it.
Last year I built myself a tiny Rogowski coil by soldering eight surface
mount inductors into an octagon. It worked too!
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Google

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