Fluke 1742 User Manual page 32

1742/1746/1748
Users Manual
Overview.
Harmonic
Components
(required for
measurements
according to certain
standards, such as
RMS value of a single
5 Hz component
IEC61000-3-12 )
Sub-Grouped
Harmonics (default)
(for IEC 61000-4-30
compliant
measurements, such as
RMS value of the
EN50160 or IEEE519
harmonic frequency and
adjacent bins
Grouped Harmonics
RMS value of the
harmonic frequency and
½ of the interharmonic
spectrum to both sides
Most power quality standards, such as EN 50160, IEEE 519,
GOST 33073 refer to IEC 61000-4-30 Class A measurement
methods that require Harmonic Sub-Groups.
Harmonic Components. The fundamental h01 and harmonics
h02 ... h50 are represented by the bin of the harmonic frequency.
The interharmonics ih01 ... ih50 are calculated from all spectral
components between two consecutive harmonic frequencies.
28
Harmonics Interharmonics
RMS value of all bins
between two harmonics
RMS value of all bins
between two
harmonics
not available
Note
Examples:
•
On a 60 Hz system, the h02 at 120 Hz is represented by the bin
no. 24 (120 Hz / 5 Hz = 24).
•
The harmonic h03 at 180Hz is represented by the bin no. 36
(180 Hz / 5 Hz = 36).
•
The interharmonic ih02 is represented by the bins no. 25 – 35
(125Hz ... 175Hz).
Select Harmonic Components for measurements according to
standards that require the harmonics components measurement
according to IEC 61000-4-7 or IEC 61000-3-12.
Sub-Grouped Harmonics. The fundamental h01 and harmonics
h02 ... h50 are the RMS average of the bin of the harmonic frequency
and one adjacent bin to each side.
The interharmonics ih01 ... ih50 are composed of the remaining
seven bins for 50Hz systems or nine bins for 60Hz systems between
two adjacent harmonics.
Examples:
•
On a 60 Hz system, the h02 at 120Hz is represented by the bin no.
23, 24, and 25 (120 Hz / 5 Hz = 24).
•
The harmonic h03 at 180 Hz is represented by the bin no. 35, 36,
and 37 (180 Hz / 5 Hz = 36).
•
The interharmonic ih02 is represented by the bins no. 26 – 34
(130 Hz ... 175 Hz).
Most power quality standards, such as EN 50160, IEEE 519,
GOST 33073 refer to IEC 61000-4-30 Class A measurement
methods that require Harmonic Sub-Groups.
Note