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Max
Or Max. Abbreviation for Maximum
MIN
Abbreviation for Minimum
N-O
NC
Acronym for Normally Closed, describes a type of relay
that has closed output contacts when de-energized (OFF
state) and open output contacts when energized (ON
state).
NO
Acronym for Normally Open, describes a type of relay that
has open output contacts when de-energized (OFF state)
and closed output contacts when energized (ON state).
Optocoupler
A four-terminal (sometimes five-terminal) electronic
component used to couple signals from high voltage
electrical systems to low voltage electronic systems while
providing electrical isolation between the two. Also known
as an optoisolator, it consists of a light source and a light
detector separated by an optically-transparent insulator. Its
simplest embodiment uses a light-emitting diode and a
photodiode separated by a thick layer of clear plastic.
Oscillography
1. A record containing sampled waveform data.
2. The science of sensing, recording, displaying, and
analyzing time-varying phenomena.
P
panel
An area on the Graphic Signal Processing screen.
PATA
Parallel ATA. See SATA.
PC
Personal Computer
PDC
Acronym for Phasor Data Concentrator.
Phasor
A phase vector (phasor) is a representation of a sine wave
whose amplitude (A), phase (θ) and frequency (ω) are time
invariant. Use of phasors simplifies certain calculations by
eliminating time (frequency) terms and leaving only
amplitude and phase.
Ping
Ping is a computer network administration utility used to
test whether a particular host is reachable across an
Internet Protocol (IP) network. It also measures the round-
trip time for packets sent from the local host to a
destination computer, including the time delay in the host
computer interfaces.
Use of the ping utility is usually described as pinging a host
computer.
PMU
Acronym for Phasor Measurement Unit.
POP3
POP3 is an abbreviation for Post Office Protocol Version 3.
POP is an application-layer Internet standard protocol used
by local E-mail clients to retrieve E-mail from a remote
server over a TCP/IP connection. Version 3 (POP3) is the
current standard.
PT
Acronym for Potential Transformer.
Q-R
RS-232
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