Any experiences with this ESR meter circuit?

[barry wilkins]

Re: Any experiences with this ESR meter circuit?

I made one some years ago,the only problem was a bit of drift .
I fitted a small bulb in the oscillator ,that cirtainly made a big difference.
Pinched the idea from HP

Barry Wilkins

[Agent24]

Re: Any experiences with this ESR meter circuit?

Probably you can but you may need to recompile the firmware and change some options to make it work on the different chip - and I have no idea what you would have to change.

[javed]

Re: Any experiences with this ESR meter circuit?

Hi Friends,

Can I use PIC18F2550 instead of PIC18F2520 in R2 D2 LCRF_ESR Meter? Please help

Javed

[javed]

Re: Any experiences with this ESR meter circuit?

Can I use PIC18F2550 instead of PIC18F2520 in R2-D2 LCF ESR Meter? Please Help

[jeff58]

Re: Any experiences with this ESR meter circuit?

Here is the translated file.
Have fun.

[Agent24]

Re: Any experiences with this ESR meter circuit?

You might have to copy out the contents of the PDF and manually paste them into Google translate?

[jeff58]

Re: Any experiences with this ESR meter circuit?

Try google translate.
I'm having difficulty with attachments.

[timarlop]

Re: Any experiences with this ESR meter circuit?

Have you translated the description PDF file in 2484_________.zip ?

[jeff58]

Re: Any experiences with this ESR meter circuit?

I just discovered the beauty of google, but its a direct translation word for word.
Can't make it out. Technical issues its not adequate.
Need some technical mind.

[timarlop]

Re: Any experiences with this ESR meter circuit?

The free viewer is available here.
http://www.abacom-online.de/uk/html/sprint-layout.html

thats for LAY files, to view .spl7 files you need sPlan 7.0 - Viewer
A free demo version of sPlan 7.0 is also available

[jeff58]

Re: Any experiences with this ESR meter circuit?

That looks like they are just piece of double-sided pcb soldered in there

There is only some strange .spl7 files on that other link?
how can one open those?

The free viewer is available here.
http://www.abacom-online.de/uk/html/sprint-layout.html

[frako]

Re: Any experiences with this ESR meter circuit?

How are those probes made ?
translation: Fiberglass soldering used on both jaws of each crocodile ??

That looks like they are just piece of double-sided pcb soldered in there

There is only some strange .spl7 files on that other link?
how can one open those?

[jeff58]

Re: Any experiences with this ESR meter circuit?

You do realize that's not a link, right?

Sorry, I know it may not be a perfect link but can be copied a paste.
Timarlop has the link. Check it out.

[timarlop]

Re: Any experiences with this ESR meter circuit?

How are those probes made ?
translation: Fiberglass soldering used on both jaws of each crocodile ??


It's better than the Russian ESR / R / L / C / F Meter (by R2-D2) ?

[frako]

Re: Any experiences with this ESR meter circuit?

Thanks Frako,
Any idea about the Russian version? Looks quite interesting although its SMD based. I would like to give it a try but unfortunately the manual is in Russian. Can't seem to find the translation. Any help is greatly appreciated.

If you mean that link from the other thread:
http://people.overclockers.ru/TerAbit/record7
It looks like a good circuit. That page says it can measure down to few milliohms, what is practically the lower measurement limit without taking into account capacitors capacitance and inductance.

Important things about this circuit are:
a) Four wire measurement
b) Synchronized rectification

Many ESR meters drive the capacitor with square wave, but there comes
the problem that test lead inductance causes about a microsecond wide voltage spike and ringing. Now when simple meters use simple diode rectifier it also adds this spike to the output and that swamps any little voltage generated from low ESR capacitors. Simply adding amplification does not help to measure lower resistances, becouse the spike is amplified too.

Some meters use sinewave but then the test lead inductance adds some voltage drop, I have measured it to correspond about 0.1...0.5 ohms. It is hard to zero out because the inductance varies with test lead position. Also the usual opamp precision rectifier starts to be too slow at 100kHz to work with millivolt accuracies.

This synchronous rectification used here is a clever thing. The circuit drives the capacitor with square wave, waits 3 us for ringing die off and then connects the sampling capacitor for a microsecond. Voltage on the sampling capacitor is then RC-filtered, converted to ground reference and amplified to 1 Volt/ohm output signal. Additional benefit is that the difference amplifier don't need great AC CMMR as it works with only DC voltages

Google translate makes quite good translation out of that page.

[Agent24]

Re: Any experiences with this ESR meter circuit?

This is a better link -> RLC -> ESR/R/L/C/F meter (by R2-D2)

You do realize that's not a link, right?

[jeff58]

Re: Any experiences with this ESR meter circuit?

This is a better link -> RLC -> ESR/R/L/C/F meter (by R2-D2)

[jeff58]

Re: Any experiences with this ESR meter circuit?

Its in PDF.
Its this file "2484______zip" in "Description"
It looks like a manual to setup and calibrate the unit. See if you can translate this Google.
http://vrtp.ru/index.php?showtopic=16397&st=220

[Agent24]

Re: Any experiences with this ESR meter circuit?

Why not use Google Translate etc?

[jeff58]

Re: Any experiences with this ESR meter circuit?

Thanks Frako,
Any idea about the Russian version? Looks quite interesting although its SMD based. I would like to give it a try but unfortunately the manual is in Russian. Can't seem to find the translation. Any help is greatly appreciated.

Here is the link: -> RLC -> ESR/R/L/C/F meter (by R2-D2)