ESR & low resistance test meter - free circuit

[Homer J Simpson]

http://www.siliconchip.com.au/cms/A_103805/article.html

Uses DMM as readout. Ability to set a signal to 100kHz is also required to
calibrate.

 

[N Cook]

http://www.siliconchip.com.au/cms/A_103805/article.html

Uses DMM as readout. Ability to set a signal to 100kHz is also required to
calibrate.

I've gone all these years without one but I might give this cct a try.
Any idea of the twin screened / coax? cable characteristics, min/max lengths
?, just cruddy old audio interconnect shielded cable sufficient ?

 

[Homer J Simpson]

I've gone all these years without one but I might give this cct a try.
Any idea of the twin screened / coax? cable characteristics, min/max
lengths
?, just cruddy old audio interconnect shielded cable sufficient ?

I'd use some of that twin flexible stereo cable (grey?) if you have it but I
have no more info on the circuit.

 

[Jim Land]

I've gone all these years without one but I might give this cct a try.
Any idea of the twin screened / coax? cable characteristics, min/max
lengths ?, just cruddy old audio interconnect shielded cable
sufficient ?

Although labelled "Twin Shielded Cable", the schematic is drawn to show
two *single-conductor* shielded cables, one to deliver the test signal to
the cap, and one to sense the response across the cap.

 

[Homer J Simpson]

Although labelled "Twin Shielded Cable", the schematic is drawn to show
two *single-conductor* shielded cables, one to deliver the test signal to
the cap, and one to sense the response across the cap.

That was a fairly standard item once - looks like zip cord but has two
shielded cables in it.

 

[Bob Parker]

http://www.siliconchip.com.au/cms/A_103805/article.html

Uses DMM as readout. Ability to set a signal to 100kHz is also required to
calibrate.

Don't forget that it needs +/- 5V supplies which need to be
regulated so the calibration won't drift.

 

[John]

http://www.siliconchip.com.au/cms/A_103805/article.html

Uses DMM as readout. Ability to set a signal to 100kHz is also required to
calibrate.

You might also like this circuit:
http://ludens.cl/Electron/esr/esr.html

While you're there, check out the rest of his electronics designs:
http://www.ludens.cl/Electron/Electron.html

John

 

[John Robertson]

http://www.siliconchip.com.au/cms/A_103805/article.html

Uses DMM as readout. Ability to set a signal to 100kHz is also required
to calibrate.

Or you can buy a kit ESR meter assembled by Dick Smith and designed by
Bob Parker... only $71.95 from us (with MOV protection option). This
unit goes down to 0.01 ohms... and is self contained! I've sold well
over 500 so far...great kit! Everything you need is in the package -
well, you could get some better probes than come with the kit, and you
will need some batteries <grin>.

Sell regularly to the Oshawa GM Truck assembly plant for training their
techs. Have also sold one to Seventh Day Advantists (SP?), Motorola
(out at NASA), some folks in the battery calibration business, and lots
of radio/TV/transmitter folks...

John :-#)#
--
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