Low-level AC voltage measurement

Discussion in 'The Projects Forum' started by SKMR168, Sep 14, 2016.

  1. SKMR168

    Thread Starter New Member

    Aug 8, 2015
    9
    1
    I am trying to build an LCR meter.It involves measurement of phase and voltage.I am successful in finding out a way to measure the phase difference between the voltage across the DUT(Device Under Test) and the current through it.But am unable to find out a circuit for measurement of low-level AC voltage.
    Can anybody please suggest me a circuit for that.
     
  2. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    What frequency, what range of voltages?
     
  3. SKMR168

    Thread Starter New Member

    Aug 8, 2015
    9
    1
    Voltage is in mV range and frequency varies over 50Hz 100kHz
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    What do you mean by measure?
    An op amp circuit can certainly be used to amplify the signal.
     
  5. SKMR168

    Thread Starter New Member

    Aug 8, 2015
    9
    1
    what if noise is there....
     
  6. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    It most certainly will be. It always is.
     
  7. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    SKMR168 likes this.
  8. Externet

    AAC Fanatic!

    Nov 29, 2005
    763
    57
    For low level AC to 100KHz, I use my audio analyzer and oscilloscope.
     
  9. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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