A fundamental waveform produced by periodic, regular
oscillation that expresses the sine or cosine or a linear
function of time or space or both.
Simple Network Management Protocol is a set of protocols for
managing complex networks. SNMP works by sending messages,
called protocol data units (PDUs), to different parts of a
network. SNMP-compliant devices store data about themselves in
Management Information Bases (MIBs) and return this data to
the SNMP requesters.
A static switch is an “intelligent switch” used to select
either the UPS’s inverter output voltage or the raw mains to
supply the load. The selection is made by control logic which
continually monitors the bypass (raw mains) and inverter
An abnormally high voltage lasting for a short period of time.
An electrical system with three different voltage lines with
sine wave waveforms that are 120 degrees out of phase from one
The ratio of the rms sum of all the harmonic components and
the fundamental signal.
An abnormal low voltage lasting for a longer period of time
than a sag.