Meter-calibrator of THD value SK6-20A, SK6-20A-01

ZET LLC

Production and calibration of measurement equipment of magnetic field and radio engineering parameters
phone +7-499-9950854, +7-495-9825912, e-mail info@zel-zet.ru


Meter-calibrator of THD SK6-20А.

Meter-calibrator of THD SK6-20A

Purpose:

  • Meter-calibrator SK6-20A is designed for:
    • automatic measurements of amplitude and frequency of first harmonic;
    • automаtic measurements of signal THD value;
    • generation of harmonic signals with given standardized values of amplitude and frequency;
    • generation of signals with given standardized values of amplitude and frequency of first harmonic and THD value.
  • Meter-calibrator also has following capabilities:
    • determination of amplitude levels and starting phase of individual harmonics relatevly to the first one;
    • determination of total level of interharmonics which fill signal spectrum between first harmonic and higher ones; total level of interharmonics is relative to the level of first harmonic
    • determination of amplitude-frequency characteristic and phase-frequency characteristic of quadripoles.
  • Meter-calibrator SK6-20A-01 can be used as secondary standard of THD value and SK6-20A – as a first grade working standard of THD value. Also SK6-20A can be used in analysis of metering instruments and different radio engineering equipment.
  • Meter-calibrator SK6-20A constists of metering unit SK6-20A, generator-calibrator of harmonic signals SK6-122 and external PC, which is not included in delivery set.

Technical specifications:

  • Basic specifications in amplitude and frequency of first harmonic and THD value measurement mode.
    • First harmonic frequency measurement range: form 1 Hz to 4999 kHz
    • Limits of first harmonic's frequency measurement absolute error: don't exceed ± (2•10-4 •F + 0,024) Hz, where F – measured frequency, Hz.
    • First harmonic amplitude (maximal value of harmonic signal) measurement range: form 0,01 to 2,0 V
    • Limits of first harmonic's amplitude measurements relative error δ0, % doesn't exceed values calculated by formula (where 2.0 V – upper limit of measurement range, Am – measured amplitude value of first harmonic, V):
            δ0 = ±[0,6 + 0,007•(2,0•Аm-1 - 1)]
    • THD value measurements range from 0,001 to 100 %
    • Limits of THD value measurement absolute error (under condition that maximal signal voltage from 0.5 to 2.0V) doesn't exceed values calculated by formulas listed in a table below (where Аm – measured amplitude of first harmonic, V)
    • First harmonic
      frequency range
      Limits of THD value measurement's absolute error, %
      1 – 10 Hz *
      More than 10 to 200 Hz *
      More than 0,20 to 20 kHz *
      More than 20 to 200 kHz *
      More than 200 to 1000 kHz *

    • Limits of THD value measurement absolute error of meter-calibrator SK6-20A-01 under condition that amplitude of first harmonic is 1 V; errors doesn't exceed values calculated by formulas listed in a table below
    • First harmonic
      frequency range
      Limits of THD value measurement absolute error, %
      From 10 to 100 Hz ±(0,01 × THD+0,0003%)
      From 0,10 to 20 kHz ±(0,003 × THD+0,0003%)
      From 20 to 200 kHz ±(0,006 × THD+0,001%)

    • Meter-calibrator specifications in amplitude and phase shift measurement of individual harmonics relative to the first harmonic and in amplitude frequency characteristics and phase frequency chrarcteristics of quadripoles determination:
            Amplitude levels measurement range from -110 to 0 dB.
            Resolution of amplitude levels measurement0,001 dB.
            Phase shifts measurements range from 0 to 360º.
            Resolution of phase shift measurement 0,1º.
    • Indication range of total interharmonics level which fill spectrum between first harmonic and higher ones (total level of interharmonics is taken relatevly to the first one): from -110 to 0 dB
  • Basic parameters and specifications in harmonic signals generation mode with given values of amplitude and frequency of first harmonic and THD value.
    • First harmonic frequency generation range from 0,1 Hz to 1 MHz.
    • Resolution of first harmonic frequency generation 0,024 Hz.
    • Limits of absolute error of first harmonic generation not more than ±(2•10-4 •F + 0,024) Hz, where F – needed frequency, Hz.
    • First harmonic amplitude (maximal value of arbitrary signal) generation range on output load of (600 ± 1) Ohm from 0,01 to 10 V.
    • Resolution of first harmonic amplitude generation of output load of (600 ± 1) Ohm 10 mV.
    • Limits of absolute error of first harmonic amplitude generation on output load of (600 ± 1) Ohm not more than ±(0,01•A + 1 mV), where A – neededamplitude, V.
    • THD value generation range from 0,001 to 100 %.
    • Resolution of THD value generation 0,001 %.
    • Limits of absolute error of THD value generation under condition that maximal value of output signal lies between 0,5 to 8 V don't exceed values calculated by formulas listed in a table below (where A – dimensionless value numerically equal to the generated value of first harmonic amplitude, V).
    • First harmonic
      frequency range
      Limits of THD value generation absolute error, %
      0,1 – 10 Hz ± (0,02·THD + 0,002·A-1 + 0,001) %
      More than 10 to 200 Hz ± (0,01·THD + 0,001·A-1 + 0,001) %
      More than 0,20 to 20 kHz ± (0,006·THD + 0,0003·A-1 + 0,005) %
      More than 20 to 200 kHz ± (0,01·THD + 0,001·A-1 + 0,0015) %

    Documenation (in russian):