Electro-Voice 250, 1252 operation manual Glossary-6

Time Stamp:	A stored representation of the time of an event. Time Stamp can include year,
	month, day, hour, minute and second and Daylight Savings Time indication.
TOU:	Time of Use.
Voltage Imbalance:	The ratio of the voltage on a phase to the average voltage on all phases.

Voltage Quality Event: An instance of abnormal voltage on a phase. The events the meter will track

	include sags, swells, interruptions and imbalances.
VT Ratio:	The Voltage Transformer Ratio is used to scale the value of the voltage to the
	primary side of an instrument transformer. Also referred to as PT Ratio.
Voltage, Vab:	Vab, Vbc, Vca are all Phase-to-Phase voltage measurements. These voltages are
	measured between the three phase voltage inputs to the meter.
Voltage, Van:	Van, Vbn, Vcn are all Phase-to-Neutral voltages applied to the monitor. These
	voltages are measured between the phase voltage inputs and Vn input to the
	meter. Technologically, these voltages can be “measured” even when the meter
	is in a Delta configuration and there is no connection to the Vn input. However,
	in this configuration, these voltages have limited meaning and are typically not
	reported.
Voltage, Vaux	This is the fourth voltage input measured from between the Vaux and Vref
	inputs. This input can be scaled to any value. However, the actual input
	voltage to the meter should be of the same magnitude as the voltages applied to
	the Va, Vb and Vc terminals.

e Electro Industries/Gauge Tech Doc # E107706 V1.25 Glossary-6