Electro-Voice 1252 - Manual (Page 149)

e Electro Industries/Gauge Tech
Doc # E107706 V1.25
Glossary-1
Glossary Glossary
0.1 Second Values: These values are the RMS values of the indicated quantity as calculated after
approximately 50 milliseconds (3 cycles) of sampling.
1 Second Values: These values are the RMS values of the indicated quantity as calculated after
one second (60 cycles) of sampling.
Alarm: An event or condition in a meter that can cause a trigger or call-back to occur.
Annunciator: A short label that identifies particular quantities or values displayed, for example
kWh.
Average (Current): When applied to current values (amps) the average is a calculated value that
corresponds to the thermal average over a specified time interval. The interval
is specified by the user in the meter profile. The interval is typically 15 minutes.
So, Average Amps is the thermal average of amps over the previous 15-minute
interval. The thermal average rises to 90% of the actual value in each time
interval. For example, if a constant 100amp load is applied, the thermal average
will indicate 90 amps after one time interval, 99 amps after two time intervals
and 99.9 amps after three time intervals.
Average (Input Pulse When applied to Input Pulse Accumulations, the “Average” refers to the block
Accumulations): (fixed) window average value of the input pulses.
Average (Power): When applied to power values (watts, VARs, VA), the average is a calculated
value that corresponds to the thermal average over a specified time interval. The
interval is specified by the user in the meter profile. The interval is typically 15
minutes. So, the Average Watts is the thermal average of watts over the
previous 15-minute interval. The thermal average rises to 90% of the actual
value in each time interval. For example, if a constant 100kW load is applied,
the thermal average will indicate 90kW after one time interval, 99kW after two
time intervals and 99.9kW after three time intervals.
Bit: A unit of computer information equivalent to the result of a choice between two
alternatives (Yes/No, On/Off, for example).
Or, the physical representation of a bit by an electrical pulse whose presence or
absence indicates data.
Binary: Relating to a system of numbers having 2 as its base (digits 0 and 1).
Block Window Avg: The Block (Fixed) Window Average is the average power calculated over a
(Power) user-set time interval, typically 15 minutes. This calculated average corresponds
to the demand calculations performed by most electric utilities in monitoring
user power demand. (See Rolling Window Average.)