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ESR meter in the battery tester

Discussion in 'Project Construction Technologies' started by caps, Jul 29, 2018.

  1. caps

    caps

    155
    8
    Jul 29, 2018
    Hi everybody.
    I constructed my ESR meter according to the known scheme of Manfred.
    http://ludens.cl/Electron/esr/esr.html
    The board was inserted into the battery tester.
    The scale is 0.005-10 ohm.
     

    Attached Files:

    davenn likes this.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    Yes, that seems to be what you did.
     
  3. caps

    caps

    155
    8
    Jul 29, 2018
    I am glad that it is clearly visible.
    By selecting the measurement modes of this circuit, it was possible to achieve an almost sinusoidal signal.
     

    Attached Files:

  4. caps

    caps

    155
    8
    Jul 29, 2018
    Specifications.
    ЕSR-0,005-10Оhm
    F-100kHz
    Vpp-100mV
    Measuring probes-50cm.
    On the meter there are gold-plated contacts for connecting capacitors.
    There is no potentiometer for zero adjustment, because there is no drift with stable power supply.
     

    Attached Files:

  5. caps

    caps

    155
    8
    Jul 29, 2018
    The battery tester was chosen specifically to not use the eps tables.
    Green sector.0,005-0,5 Ohm corresponds to the range of capacitors 10000uF-100uF.
    The small sector.0.5-2 Ohm corresponds to the range of capacitors 100uF-10uF. Capacitors of small capacity fall into the red sector.
    The scale was calibrated with precision, non-inductive resistors.
     

    Attached Files:

    Last edited: Jul 30, 2018
    davenn likes this.
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    Ok it seems you don't have a question. Perhaps you should have posted this in another section :)

    However, I would advise you to double the frequency from 50kHz to 100kHz. ESR is typically specified at this frequency.
     
  7. caps

    caps

    155
    8
    Jul 29, 2018
    I already wrote that my ESR meter works at a frequency of 100 kHz.
    You can transfer my topic to another place, there are no problems.
     
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    Fine, the original circuit you referred to use 50kHz.

    Presumably your meter has fixed leads and hence the zero can be set one and forgotten. I usually use a set of dedicated probes for mine, but sometimes I change to another set (mine can use regular multimeter probes) and hence the lead resistance can change.

    Whilst reading your thread, and also designing a circuit which needs Kelvin connections to a sense resistor and possibly polymer caps I have been wondering why ESR meters can't use Kelvin connections to the capacitor. If I needed to measure ESR in the region of a couple of millions it would make sense to have that sort of measurement.
     
  9. caps

    caps

    155
    8
    Jul 29, 2018
    This meter was not designed for very accurate measurements of ESR. It is made for rapid express analysis of capacitors. Good-bad. Calibration was performed only for the limits of sectors,although it is possible to mark the scale more accurately.
    My circuit is slightly different from the original and was made at a frequency of 100kHz.
     
    Last edited: Aug 1, 2018
  10. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    Perhaps you can post the circuit for the benefit of others.

    One thing I didn't comment on earlier is the somewhat imperfect triangular waveform in post #3 in this thread that you describe as a sine wave.
     
  11. caps

    caps

    155
    8
    Jul 29, 2018
    Does this somehow affect the measurement of the ESR capacitors?
     
  12. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    It does have a significant harmonic content so your measurement may be affected a little by it.

    Having said that, I don't know if ESR meters typically use a more pure sine wave.
     
  13. caps

    caps

    155
    8
    Jul 29, 2018
    Different meters have different signals.
     

    Attached Files:

  14. caps

    caps

    155
    8
    Jul 29, 2018
    Tantalum capacitor, 220μF in the circuit.
     

    Attached Files:

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