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From: "Klaus Vestergaard Kragelund"
Subject: Re: Open air current sensing PCB mount shunts...
Date: Sat, 14 Dec 2002 17:33:52 -0500
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Organization: TDC Internet
"John Larkin" wrote in
> On 13 Dec 2002 15:59:17 -0600, boB gudg wrote:
> >I'm looking for sources for current sensing shunts in the 1 to 2
> >milliOhm and 2 to 5 Watt range. I have seen OAR series from IRC
> >and RCD and Token but it looks like they aren't very popular... ie,
> >long lead times etc...
> >I have a couple of IRC samples and they work pretty good actually.
> >Made of Manganin I think with good TempCo.
> >Any preferences ??
> Isotek makes pcb-mount shunts, too.
> We punch our own from sheet manganin, but that's a hassle unless you
> need a whole lot. Manganin does have pretty good tempcos...
I've used Manganin in a previous job. Great tempco as you say - but some
people in our department was worried about the thermal expansion coefficient
when the shunt is mounted on FR4. They worried about the thermal cycles
destroying the PCB. Have you experienced anything like this?
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