I was perusing a few sites today and was surprised that so many offer the wrong source of the definition for a Quadrature Encoder.
The offenders all gave a variation of below. Many that should know better.
e,g:
"The name quadrature comes from the four possible output states of the encoder sensor. Rather than just a single pulse indicating a slotted or striped track in a codewheel, quad encoders use a pair of tracks to go through four distinct phases. . .quad means four."
Simply not true.
The term Quadrature in this context originally meant that the two waveform's are displaced by 90°.
In fact the early Quadrature encoder simply used the two A & B signals and did not use the x4 method.
Another example of wrong dissemination of information/terminology.
Max.
The offenders all gave a variation of below. Many that should know better.
e,g:
"The name quadrature comes from the four possible output states of the encoder sensor. Rather than just a single pulse indicating a slotted or striped track in a codewheel, quad encoders use a pair of tracks to go through four distinct phases. . .quad means four."
Simply not true.
The term Quadrature in this context originally meant that the two waveform's are displaced by 90°.
In fact the early Quadrature encoder simply used the two A & B signals and did not use the x4 method.
Another example of wrong dissemination of information/terminology.
Max.