Pole terminal
A pole terminal is usually a screwable or spring- loaded connection for connecting cables to individual contacts of electrical devices or assemblies . Depending on the design, they enable an electrically conductive connection that can be released with or without tools . A clamping, pluggable connection consists of a single plug with a matching counterpart to the plug receptacle.
Electrical engineering in general
The connection terminals of electric motors and generators are commonly referred to as pole terminals.
Automotive electrics
In motor vehicle electrics , the screwed clamp connections for the connections of the starter battery are referred to as pole terminals. They ensure a mechanically secure connection and, thanks to their large contact area, permit high currents, such as those that occur when the starter is operated. The plier clamps on the jumper cables to the booster or chargers are called binding posts.
Laboratory technology
In laboratory technology, the electrical connections of laboratory devices such as B. voltage sources and measuring devices called pole terminal. The de facto standard for such terminals is the socket for the 4 mm spring pin (" banana plug ").
Electric welding
In electric welding, the earth terminal of the welding device that is permanently connected to the workpiece during the welding process is called the pole terminal.
Loudspeaker pole clamp
In a public address system , the pole terminal is the receptacle (the connection terminal) for the loudspeaker cable on a loudspeaker or on the signal-emitting source, the full or power amplifier . Pole terminals are always used in pairs in the loudspeaker housing in order to be able to connect the forward and return lines of the loudspeaker cable. Brass or copper are often used as the material. In the best case, pole terminals are designed in such a way that they can hold cable lugs, banana plugs or the stripped cable strand of the speaker cable firmly and safely against short circuits.
Some loudspeaker boxes have 2 or 3 pairs of pole clamps in the housing. Here the loudspeakers are led out from 2-way or 3-way boxes without a loudspeaker crossover. This means that the individual loudspeaker chassis can be operated with so-called bi-amping or tri-amping for each frequency range.
Binding posts are often red and black to ensure the correct polarity of the speaker cable. If the polarity of the loudspeaker or a sound branch (e.g. the low-frequency branch) is reversed, the sound deteriorates because the phase position of the loudspeakers is then incorrect. As a result, the stereo impression suffers or the depth reproduction is poor.
Individual evidence
- ↑ Lueger, Otto: Lexicon of the whole technology and its auxiliary sciences , Vol. 3 Stuttgart, Leipzig 1906., S. 304-315.
- ^ Meyers Großes Konversations-Lexikon, Volume 5. Leipzig 1906, pp. 634–639.
- ^ Alfred Böge (Hrsg.): Manual mechanical engineering: Basics and applications of mechanical engineering 19th edition. Vieweg + Teubner Verlag 2008, ISBN 978-3-8348-0487-7 , p. M43.
- ↑ Michael Ebner: Manual of PA technology. 1st edition, Elektor-Verlag, Aachen, 2002, ISBN 3-89576-114-1