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HEDR-80002K Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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HEDR-80002K Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 8 page  3 State Width (S): The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90 °e. State Width Error ( ∆S): The deviation in electrical degrees of each state width from its ideal value of 90 °e. Phase ( φ): The number of electrical degrees between the center of the high state on channel A and the center of the high state on channel B. This value is nominally 90 °e. Phase Error ( ∆φ): The deviation in electrical degrees of the phase from its ideal value of 90 °e. Direction of Rotation: When the codewheel or codestrip moves in the direction from pin 1 to pin 4, as viewed when looking down on the lenses, channel B will lead channel A. If the codewheel or codestrip moves in the opposite direction, channel A will lead channel B. Optical Radius (Rop): For rotary motion, the distance from the codewheel’s center of rotation to the center line connecting the two lenses of the encoder. Gap (G): The distance from the top of the package to the surface of the reflective codewheel or codestrip. Specular Reflectance (Rf): a measure of a surface’s reflective finish. This is quantified by the amount of light reflected when hit with an incident beam. A device called a scatterometer is used to quantify specular reflectance on a percent scale. (Contact factory for more information.) Radial and Tangential Misalignment Error (ER, ET): For rotary motion, mechanical misalignment in the radial and tangential directions relative to the codewheel. Angular Misalignment Error (EA): angular misalignment of the sensor in relation to the tangential direction. This applies for both rotary and linear motion. Output Waveforms HEDR-8000 SHAFT CODEWHEEL RADIAL TANGENTIAL HEDR-8000 SHAFT CODEWHEEL EA S1 S2 S3 S4 φ P C CH. B CH. A ALL FOUR STATES (S1 TO S4) ARE MAINTAINED. CODEWHEEL ROTATION OR LINEAR MOVEMENT AMPLITUDE Definitions Count (N): For rotary motion, the number of bar and window pairs or counts per revolution (CPR) of the codewheel. For linear motion, the number of bar and window pairs per unit length (lines per inch [LPI] or lines per mm [LPmm]). One Cycle (C): 360 electrical degrees ( °e), 1 bar and window pair. One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only). Line Density: The number of reflective and non-reflective pairs per unit length, expressed as either lines per inch (LPI) or lines per mm (LPmm). Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180 °e or 1/2 a cycle. Pulse Width Error ( ∆P): The deviation in electrical degrees of the pulse width from its ideal value of 180 °e. |
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