UG-572 Datasheet, PDF (12/20 Pages) Winchester Electronics Corporation – C JACK

UG-572
READ RMS REGISTERS
The Read RMS Registers window, shown in Figure 17, shows
the signal path for the two voltage signals and one current
signal to get the rms value. The rms offset (xxRMSOS) register
can be modified. The rms display shows a reading and cannot
be modified.
• On the right side of the window is the Active Data Path
drop-down menu. The selected data path is displayed in
the window.
• When Phase N is chosen, a switch appears on the left side.
This switches the NIRMS register between displaying
NIRMS or ISUM RMS (The rms value of ISUM, the
instantaneous sum of all three phase currents).
• At the bottom of the window, Read RMS registers reads
the rms values in synchronization with a phase voltage or
current. The source to be synchronous with can be chosen
with Zero-Crossing Source. It is recommended to set the
Number of Averages to a minimum of 100.
• Exit returns to the main menu.
• Read reads the current configuration of the part and the
instantaneous rms values.
• Write writes the current configuration to the registers.
• Total Harmonic Distortion goes to the THD window.
See the Total Harmonic Distortion section for details.
EVAL-ADE7978EBZ User Guide
READ FUNDAMENTAL RMS
The Read Fundamental RMS window is shown in Figure 18.
This window shows the signal path for Voltage 1 and the
current signal to calculate the fundamental rms values. The
fundamental rms offset (xFxRMSOS) register can be modified
in the labeled box. The rms display shows a reading and cannot
be modified.
• On the right side of the window is the Active Data Path
drop-down menu. The selected data path is displayed in
the window.
• At the bottom of the window, Read Fund. RMS registers
reads the rms values in synchronization with a phase
voltage or current. The source to be synchronous with can
be chosen with Zero-Crossing Source. It is recommended
to set the Number of Averages to 100.
• Exit returns to the main menu.
• Read reads the current configuration of the part and the
instantaneous rms values.
• Write writes the current configuration to the registers.
Total Harmonic Distortion goes to the THD window. See the
Total Harmonic Distortion section for details.
Figure 17. Read RMS Registers
Figure 18. Read Fundamental RMS
Rev. 0 | Page 12 of 20