Amprobe DMII-PRO Data-Logger-Recorder - Manual (Page 27)

R
Symbols & Definitions of
Terms Used on the DM-II
SYMBOLS AND DEFINITIONS OF TERMS USED ON THE DM-II
V (V) - Voltage RMS
I (A) - Current RMS
S (VA) - Apparent Power
P (W or kW) - Working Power
Q (VAR) - Reactive Power
PF - Power Factor
RMS
Root mean square value, which is the effective value of an alternating current or voltage. Unless
otherwise specified, the AC values are always RMS i.e. the typical receptacle is 110V RMS.
RMS max
Greatest, maximum value of the RMS voltage or current which occurred during the recording time.
RMS min
Lowest, minimum value of the RMS voltage or current which occurred during the recording time.
RMS avg
Average RMS value of voltage or current, which is a sum of all RMS measured values divided by
the number of values
PEAK max
The greatest instantaneous value of voltage or current (the highest point of the sinusoid)
1 ø Power
Power in the selected phase
1 ø Energy
Energy in the selected phase
3 ø Power
Total power in all phases
3 ø Energy
Total energy in all phases
3
ø Demand
The highest average usage of energy during 15 or 30 minute intervals throughout 30 day period of
time.
V
AN
, V
AB
Letters used in a subscript describe what are the reference points for measurement i.e. V
AN
- Voltage
between phase A and Neutral wire, V
AB
- Voltage between phase A and B.
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