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From: email@example.com (Bill Sloman)
Subject: Re: Determining type of passive component on LCR meter
Date: 10 Jan 2003 03:40:05 -0800
References: <firstname.lastname@example.org> <2egT9.10445$3v.1828@sccrnsc01>
NNTP-Posting-Date: 10 Jan 2003 11:40:05 GMT
"George R. Gonzalez" wrote in message news:<2egT9.10445$3v.1828@sccrnsc01>...
> "Kevin" wrote in message
> > I am trying to determine if there is a way to distinguish between
> > unknown passive components using an LCR meter or some other type of
> > measuring equipment. Some passive componets don't always have part
> > markings and if they get mixed up how can I determine what type of
> > part it is and the value. An example would be removing a resistor and
> > an inductor from a reel and getting them mixed up. Is there any type
> > of measruing equipment available that I can just put one of the
> > components in and determine if it is a resistor, capacitor or and
> > inductor?
> Inductors usually have a wide first band, and are packaged in plastic
> Of course some old capacitors came that way too.
> An ohmmeter will usually do the trick:
> Ohms infinite or keep rising with time: A capacitor
> Ohms low ( < 1000 ) and keep dropping with time or ohms doesnt match color
> code: An inductor.
> Ohms > 1000 and steady: Most probably a resistor
> Or you can buy a multi-kilobuck LCR bridge.
The U.K. manufactured Thurlby Thandar LCR400 precision LCR bridge
displays real (resistive) and imaginary (inductive or capacitative)
impedance at the same time. You can only measure at 100Hz, 1kHz or
10kHz, which means that it is not much good with sub-microhenry
inductors, but it is 0.1% accurate for most components, and doesn't
even cost one kilobuck.
Farnell advertise it for 966.60 euro, which is still (just) less than
By the time Dubba gets through with applying voodoo economics to the
U.S. economy, this won't be true, so - for those few U.S. members of
the user-group who still haven't put me on their kill-file - buy it
*now* while you can still afford it!
We've had ours since October, and I'm getting very fond of it.
Bill Sloman, Nijmegen
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