Glossary

CISPR 18-1:2010(E), which is a technical report, applies to radio noise from overhead power lines and high-voltage equipment which may cause interference to radio reception. The scope of this publication includes the causes, measurement and effects of radio interference, design aspects in(...)

CISPR 18-2:2010(E), which is a technical report, applies to radio noise from overhead power lines and high-voltage equipment which may cause interference to radio reception. The frequency range covered is 0,15 MHz to 300 MHz. A general procedure for establishing the limits of the radio noise(...)

CISPR 18-3:2010(E), which is a technical report, applies to radio noise from overhead power lines and high-voltage equipment which may cause interference to radio reception, excluding the fields from power line carrier signals. The frequency range covered is 0,15 MHz to 300 MHz. 

Amplifier where the output transistors conduct (i.e. do not fully turn off) irrespective of the output signal waveform. This type of amplifier is typically associated with high linearity but low efficiency.

Amplifier that combines Class A and Class B to achieve an amplifier with more efficiency than Class A but with lower distortion than class B.

Amplifiers where the output transistors only conduct during half (180 degrees) of the signal waveform.

Form of switching amplifier in which the transistors are on for less than a half cycle (less than 180 degrees).

Amplifiers where the output is a switching waveform, at a frequency far higher than the highest audio signal that needs to be reproduced.

Amplifiers that are similar to class AB amplifiers except they use two or more supply voltages.

Amplifiers that modulate the supply voltage to the amplifier output devices so that it is never higher than necessary to support the signal swing.

Signals that are identical in amplitude and phase at both inputs; the potential or voltage that exists between neutral and ground.

Unbalanced current (current not returned) within a cable.

Interference that appears on both signal leads (signal and circuit return), or the terminals of a measuring circuit, and ground.

Identical signal components on both the + and - inputs of a differential amplifier or instrumentation amplifier (i.e. balanced pair).

Radio frequency current that flows on one or more conductors connected to an electric circuit, or alternatively, radio frequency voltage between conductors connected to an electric circuit.

Ability of an electronic circuit, a piece of equipment, or a subsystem or system to operate acceptably when subjected to radio frequency voltage or current on interconnecting conductors.

Electrical intermodulation in which there are produced frequencies equal to the sums and differences of a desired and an undesired frequency or of their harmonics.

Unwanted signals in a communication channel (as in a telephone, radio, or computer) caused by transference of energy from another circuit (as by leakage or coupling).

An electrical device that can measure amperage without breaking a circuit. Current probes sense the current flowing through a conductor and convert it to a voltage that can be viewed and measured on an oscilloscope.

System which acquires data, generally by digitizing analog channels and storing the data in digital form. These systems can be standalone or married to a computer and can acquire multiple channels of data.

System which acquires data, generally by digitizing analog channels and storing the data in digital form. These systems can be standalone or married to a computer and can acquire multiple channels of data.

A unit that defines a signal level by comparing it to a reference level. The reference level of 0dBm is defined as 1mW. The signal level in dBm is 10 times the log of the signal's power over that of the 0dBm reference.

A unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratio.

A signed document regarding compliance of a product with European safety standards and legislation.

Detector is used as the final stage of demodulation in a superhetrodyne receiver. It is used to recover the envelope of the input or baseband signal from the intermediate frequency (IF) components or carrier.

The effect when a capacitor that has been charged for a long time and then been completely discharged has a small voltage on its terminal wires again, within seconds or minutes.

A signal that appears on two lines of a closed loop, but current flow is in opposite directions.

A two-terminal semiconductor device that rectifies signals (passes current in only one direction).

Simplest and most widely used class of antenna. It consists of two identical conductive elements such as metal wires or rods, which are usually bilaterally symmetrical.

A unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratio.

A device which provides frequency conversion to a lower frequency, e.g. in digital broadcast satellite applications.

An antenna that has two modes of operation.