User Manual, Firmware rev. 3.0 or LATER Owner's manual
Publication 1404-UM001F-EN-P - November 2009 173
Advanced Features Chapter 8
• TIF: Telephone influence factor. Range 0.0…999.9*10
22
• K-factor: Range 0.0…999.9*10
22
• IEEE-519 TDD: Total demand distortion. Range 0.0…999.9*10
22
• IEEE-519 Pass/fail: -1 = unknown, 0 = fail, 1 = pass
• FFT iteration: each new FFT calculation (used in the previous
four parameters) increments by one from 0…32,767 and rolls
back to 0
A data client may determine the relative freshness of data by
comparing the THD & crest iteration or FFT iteration parameters in
repeated reads of this table.
Reading Individual Harmonic Values
The M6 and M8 models provide several data tables containing
individual harmonic results. Individual harmonic value data is not
available via Modbus communication. Write to the Harmonic Analysis
Configuration/Read-back Select table to select the Read-back mode,
data type (magnitude or distortion per cent) and/or channel number
of harmonic data. A data client reads the tables listed below in
indexed Read-back mode to obtain individual harmonic data. In
Auto-increment mode, read the Harmonic Results; THD, Crest Factor,
and More table to index the channel.
• Harmonic Results; Odd Harmonics 1…21
Table (M6 and M8)
• Harmonic Results; Odd Harmonics 23…41
Table (M6 and M8)
• Harmonic Results; Even Harmonics 2…20
Table (M6 and M8)
• Harmonic Results; Even Harmonics 22
…40 Table (M6 and M8)
• Harmonic Results; Odd Harmonics 43…63
Table (M8 only)
• Harmonic Results; Even Harmonics 42…62
Table (M8 only)
Each of these tables consists of 14 floating-point elements containing
the following parameters:
• Channel: 1 = V1, 2 = I1, 3 = V2, 4 = I2, 5 = V3, 6 = I3, 7 = I4 (no
averages)
• Type of harmonic data: 0 = per cent harmonic distortion, 1 =
magnitude
• Nth harmonic: expressed according to the type parameter.
Magnitude type is referenced to the primary side of PTs and CTs.
Range: 0.0…999.9 * 10
22
• FFT iteration: each new FFT calculation (used in the previous
four parameters) increments by one from 0…32,767 and rolls
back to 0