Electronic terms, glossary of electronic terms, electronic terms
starting from alphabet O, Collection of Electronic Definitions, electronic
Acronyms and terms related to electronic industry
Octal Number system .A number system based on powers of eight.
This system is used extensively in computer work.
Off line test equipmentEquipment that tests and isolates faults in
modules or assemblies removed from systems.
Octave
Interval between two sounds whose
fundamental frequencies differ by a ratio of 2 to 1. 440 Hz. is one octave
above 220 Hz.
Offset null
An op amp control pin used to
eliminate the effects of internal component voltages on the output of the
device.
Ohm
Unit of resistance symbolized by the
Greek capital letter omega (W).
Ohmmeter
Device used to measure electrical
resistance.
Ohm's law
Relationship between voltage, current
and resistance. Ohm's law states that current in a resistance varies in
direct proportion to voltage applied and inversely proportional to
resistance.
Ohms per volt
Refers to a value of ohms per volt of
full scale defection for a moving coil meter movement. The number of ohms
per volt is the reciprocal of the amount of current required to produce full
scale deflection of the needle. A meter requiring 50 micro amps for full
scale deflection has an internal resistance of 20 kW per volt. The higher
the ohms per volt rating, the more sensitive the meter.
open loop mode
An amplifier circuit having no means
of comparing the output with the input. (No feedback.)
Operational amplifier
A high gain DC amplifier that has a
high input impedance and a low output impedance. Op-amps are the most basic
type of linear integrated circuits.
Oscillate
To produce a continuous output
waveform without an input signal present.
Oscillator
An electronic circuit that produces a
continuous output waveform with only DC applied.
Oscilloscope
An instrument used to display a
signal graphically. Shows signal amplitude, period and wave shape in addition
to any DC voltage present. A multiple trace oscilloscope can show two or
more waveforms at the same time for phase comparison and timing
measurements.
Out of phase
When the maximum and minimum points
of two or more wave shapes do not occur at the same time.
Output
Terminal at which a component,
circuit or piece of equipment delivers current, voltage or power.
Output impedance
Impedance measured across the output
terminals of a device without a load connected.
Output power
Amount of power a component, circuit
or system can deliver to a load.
Overload
Condition that occurs when the load
is greater than the system was designed to handle. (Load resistance too
small, load current too high.) Overload results in waveform distortion
and/or overheating.
Overload protection
Protective device such as a fuse or
circuit breaker that automatically disconnects a load when current exceeds a
predetermined value
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