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Skip menu## Meter-calibrator of THD **SK6-20А**.

**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)
- 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
- 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 measurement**0,001 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 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 | _{} |

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%) |

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) % |