Author Topic: Isn't it ESR Meter showing correct?  (Read 3334 times)

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Offline Savetheday

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Isn't it ESR Meter showing correct?
« on: October 11, 2014, 09:32:10 am »
Hi
I buyed an used ESR Meter from ebay.After turning the device on.it shows the number 1 in display.When i try to measure capacitors it allways shows numbers greater then 1.3 or higher. Isn't it suppose to show numbers below 1 ?
thanks.
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Offline Savetheday

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Re: Isn't it ESR Meter showing correct?
« Reply #1 on: October 11, 2014, 09:34:19 am »
other pictures
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Offline Savetheday

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Re: Isn't it ESR Meter showing correct?
« Reply #2 on: October 11, 2014, 09:42:27 am »
last
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Offline nitro2k01

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Re: Isn't it ESR Meter showing correct?
« Reply #3 on: October 11, 2014, 09:47:03 am »
Note the position of the 1. The 1 you are seeing is not the number 1, but means "overload", too high resistance to measure (open circuit).
1.3 ohm is a reasonable ESR value for some capacitors. Which type of capacitor did you probe? (Value and voltage rating.) What happens if you short the probes?
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Offline Savetheday

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Re: Isn't it ESR Meter showing correct?
« Reply #4 on: October 11, 2014, 11:16:08 am »
Ok i didn't know that.Good to know.And short probe value is 1 as you can see in the picture.
capacitor value
470 uF 25V
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Offline kripton2035

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Re: Isn't it ESR Meter showing correct?
« Reply #5 on: October 11, 2014, 11:30:56 am »
seems to be the elektor esr meter from september 2002
here is a link to the original article and the method for calibrating.
http://kripton2035.free.fr/commercial%20esr/esr-elektor-sept.html

Offline Savetheday

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Re: Isn't it ESR Meter showing correct?
« Reply #6 on: October 13, 2014, 12:21:45 am »
seems to be the elektor esr meter from september 2002
here is a link to the original article and the method for calibrating.
http://kripton2035.free.fr/commercial%20esr/esr-elektor-sept.html
Thanks but i didn't get it.Is It still working and usable?
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Offline kripton2035

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Re: Isn't it ESR Meter showing correct?
« Reply #7 on: October 13, 2014, 06:05:49 am »
seems to be the elektor esr meter from september 2002
here is a link to the original article and the method for calibrating.
http://kripton2035.free.fr/commercial%20esr/esr-elektor-sept.html
Thanks but i didn't get it.Is It still working and usable?
yes first link in the description - just downloaded again it's working.

Offline Savetheday

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Re: Isn't it ESR Meter showing correct?
« Reply #8 on: April 26, 2015, 05:17:34 pm »

Sorry for long break
 
ESR Meter Calibration

First of all I checked IC5 and IC7 component and its around (+ -) 4.98 volts and then disconnected P1

It says Elektro 9/2002 at the page 19 like this

Quote
ESR Tester adjustment
Start with the voltmeter circuit.
P1 should be disconnected at this
point. Connect a known, accurate
voltage source of less than 200
mV to point TPA (test point A)
and adjust P5 until the LCD
shows the right value. Remove the voltage source. Connect TPA to TPB,
short the test leads together, and adjust
P2 for a ‘000.0’ reading. Remove the connection.
Reconnect P1.

Ok i set voltage source to 0.150 V and then connected to positive(red cable) crocodile connecter ESR Meter TPA (There are TPA and A labels!) and now which part should i connect negative (black cable) ? There is no GND label?
So I tried with negative crocodle connecter to A lable and then i read (1 .) open circuit i adjust P5 and then with without any idea other potentiometers P2,P3,P4 but no changes.it's still (1 .)
Last question do we need extra DMM for readings i'm looking only Esr Meter screen.
Thanks.
« Last Edit: April 27, 2015, 01:17:40 pm by Savetheday »
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