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From globalspec.com
The term "pulses/rev" is sometimes used to describe the output of incremental encoders, even when the output is in square-waves rather than pulse format. This indiscriminate usage creates confusion among encoder users. Square-waves are not the same as pulses, and it is important that the distinction be made. The most common format for incremental encoder output is "quadrature square-waves," a term that denotes two square-waves that are phase-shifted with respect to each other by 90 degrees electrical, or one-quarter of a cycle. Their spatial frequency is best expressed in "cycles per revolution." Usually, this is the same as the number of lines on the encoder disc. However, some manufacturers offer interpolated square-waves at many times the line count on the disc, but that is another subject. For purposes of this discussion, there is no difference between 1X square-waves, read directly from the disc, and interpolated square-waves, which are at some multiple of the line count on the disc. Products & Services
Incremental rotary encoders are multi-turn sensors that use optical, mechanical, or magnetic index-counting for angular measurement. They contain no absolute reference, but instead count relative to the turn-on position.
Linear encoders sense and digitize linear position change for positional measurement and feedback to control systems.
Magnetostrictive position sensors are non-contact linear position sensors that use the momentary interaction of two magnetic fields to produce a strain pulse that moves along a waveguide. One field is from a magnet that moves along the outside of the waveguide. The other field is from the waveguide itself.
Programmable power supplies are digitally controlled power sources that provide accurate and adjustable levels of voltage, current, and frequency. They include a processor, voltage/current programming circuits, current shunt, and voltage/current read-back circuits.
Absolute rotary encoders use optical, mechanical, or magnetic indexing for angular measurement. They do not lose their position after power-down, but instead provide absolute position upon power-up without requiring a home cycle or any shaft rotation.
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