Trouble is that the low temp co. alloys suitable for making shunts are quite dense.  The shunt needs to be physically massive in order to be able carry such high currents without a significant temperature rise.  You could use a block of aluminium alloy which would certainly be much lighter, but the temp co. wouldn't be very good.

Mike

-----Original Message-----
From:   Andrew Kunz [SMTP:akunz@TDIPOWER.COM]
Sent:   Monday, March 27, 2000 1:20 PM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: [OT] Resistance

Understood.  Our 100A shunts weigh half a pound.  I need something LIGHT!

Andy




"Thomas C. Sefranek" <tcs@CMCORP.COM> on 03/24/2000 03:59:20 PM

Please respond to pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>

 To:      PICLIST@MITVMA.MIT.EDU

 cc:      (bcc: Andrew Kunz/TDI_NOTES)

 Subject: Re: [OT] Resistance

Andrew Kunz wrote:

> For the 100A 480V ones we use at the office, yes.  But brass lets the
electrons
> pass too easily for what I'm doing, I think.

A standard shunt does not care what voltage is in the circuit.
A 480 volt shunt is just as effective in a 12 volt circuit.
It is a resistor made out of brass that creates a voltage drop across it
 in proportion to the current through it.
The bulk resistance is related to the dimensions of the brass.
Width, length, and thickness.

> You have a table?

No.

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  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
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