Modular Power Meter
Modular power meter version 1.0 Page 6 / 40
1. Purpose
This document describes the use and the functional specifications of the modular power meter
sensors. This is identified by Project-ID PJ201.
2. Intended Audience
The intended audience is generally anybody who wants to measure power distribution
systems.
3. Glossary
Arms Ampere root-mean-square
As Ampere-second, 1A current measured during 1 second
CF Crest Factor
F Frequency
Hz Hertz, 1Hz = 1/second
I current
Ithd Total harmonic distortion of the current
N Neutral line
L1, L2, L3 Power lines 1, 2 and 3
LSB Least significant bit (value resolution in the MODBUS packet)
P Real Power
PE Protective Earth
PF Power Factor (=Voltage or current peek/RMS)
PGA Programmable Gain Amplifiers
Q Reactive Power
RMS Root Mean Square value
S Apparent Power
U Voltage
Uthd Total harmonic distortion of the voltage
VAC Voltage for alternating current
VDC Voltage for direct current
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