The basic operation characteristic of photoelectric cam and groove coupling

　　The basic operation characteristic of photoelectric cam and groove coupling：

　　Common mode‘s rejection ratio is high:

　　In the photoelectric cam and groove coupling, because the coupling capacitance between the light emitting tube and optical device is very small (within 2pF) so the common mode input voltage through the influence of coupling capacitance between the output current is very small, so the common mode rejection ratio is very high.

　　Output characteristics:

　　The output characteristic of photoelectric cam and groove coupling refers to the relationship between the photosensitive tube bias voltage VCE and the output current of IC in a certain emission current IF is constant, , when IF=0, the light-emitting diode does not emit light, the output current of the photosensitive transistor collector is known as the dark current, generally small. When IF>0, in the IF under the action of certain, the corresponding IC basically has nothing to do with VCE. Changes between IC and IF is a linear output characteristic of photoelectric cam and groove coupling, the measured properties graphic instrument for semiconductor tube and transistor output characteristics similar to. The test connection as shown in Figure 2, figure D, C, E three lines respectively corresponding to B, C, E, connected to the instrument socket.

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