Bird Technologies BDS-Manual - Manual (Page 93)

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VIMeas – Single BDS V & I measurement result.
The BDS produces one of these structures per frequency measurement. These structures are grouped together by
fundamental frequency to compose a complete measurement dataset. The number of measurements reported per
dataset depends on the class-level configuration attributes of the Standard Mode object. Structure size = 25 bytes.
VIMeas – Single BDS V & I Measurement Result.
Name Data Type Description Byte
Fundamental
Num USINT Fundamental frequency index number.
One of the following values (ranging 0-5):
0 – Invalid measurement.
1 – 5 – The selected fundamental index/instance
ID. 0
Harmonic
Num USINT Harmonic frequency index number.
One of the following values (ranging 0-15):
0 – The fundamental.
1 – The first harmonic.
…
15 – The fifteenth harmonic. 1
Intermod
Num SINT Intermodulation product number.
One of the following values:
-3 – 3
rd “minus” intermod.
-2 – 2 nd “minus” intermod.
-1 – 1 st “minus” intermod.
0 – No intermod.
1 – 1
st “plus” intermod.
2 – 2 nd “plus” intermod.
3 – 3 rd “plus” intermod.
2
Voltage Attn USINT Voltage channel attenuation used (in dB). Value
range 0-30dB. 3
Current Attn USINT Current channel attenuation used (in dB). Value
range 0-30dB. 4
Frequency UDINT Estimated fundamental frequency value in Hz.
Value range: 1-499,999,999Hz in 8-bit ADC mode,
1-99,999,999Hz in 12-bit mode. 0 is an invalid
frequency. 5
Voltage REAL Voltage magnitude (in Vrms). 9
Current REAL Current magnitude (in Firms). 13
Phase REAL Phase between voltage and current channels in
radians. Always between
-PI and +PI. 17
Relative
Phase REAL The phase relative to the fundamental frequency in
radians. Always between
-PI and +PI. This is used to reconstruct a
waveform. 21