|Description||Quick Assembly Two And Three Channel Optical Encoder|
|Company||Agilent Technologies, Inc.|
|Datasheet||Download HEDS-5540E06 datasheet
|Quick Assembly Two and Three Channel Optical Encoders Technical Data
HEDS-5500/5600 and HEDM5500/ 5600 are two square waves in quadrature. The HEDS-5540 and 5640 also have a third channel index output in addition to the two channel quadrature. This index output a 90 electrical degree, high true index pulse which is generated once for each full rotation of the codewheel. The HEDS series utilizes metal codewheels, while the HEDM series utilizes a film codewheel allowing for resolutions to 1024 CPR. The HEDM series is nont available with a third channel index. These encoders may be quickly and easily mounted to a motor. For larger diameter motors, the HEDM-5600, and HEDS-5600/ 5640 feature external mounting ears. The quadrature signals and the index pulse are accessed through five 0.025 inch square pins located on 0.1 inch centers. Standard resolutions between 96 and 1024 counts per revolution are presently available. Consult local Agilent sales representatives for other resolutions.Features
Two Channel Quadrature Output with Optional Index Pulse Quick and Easy Assembly No Signal Adjustment Required External Mounting Ears Available Low Cost Resolutions to 1024 Counts Per Revolution Small Size 100 °C Operating Temperature TTL Compatible Single 5 V SupplyApplications
The 5600, 5640, and the HEDM-5500, 5600 provide motion detection at a low cost, making them ideal for high volume applications. Typical applications include printers, plotters, tape drives, positioning tables, and automatic handlers. Note: Agilent Technologies encoders are not recommended for use in safety critical applications. Eg. ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed.Description
The HEDS-5500/5540, HEDS5600/5640, and HEDM-5500/ 5600 are high performance, low cost, two and three channel optical incremental encoders. These encoders emphasize high reliability, high resolution, and easy assembly. Each encoder contains a lensed LED source, an integrated circuit with detectors and output circuitry, and a codewheel which rotates between the emitter and detector IC. The outputs of theESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
The 5600, 5640, and HEDM-5500, 5600 translate the rotary motion of a shaft into either a two- or a threechannel digital output. As seen in the block diagram, these encoders contain a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the codewheel. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. The photodiode outputs are then fed through the signal processing circuitry resulting A, B and B (also I and I in the HEDS-5540 and 5640). Comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the digital output of channel is in quadrature with that of channel B (90 degrees out of phase). In the HEDS-5540 and 5640, the output of the comparator for I and I is sent to the index processing circuitry along with the outputs of channels A and B.
The final output of channel is an index pulse PO which is generated once for each full rotation of the codewheel. This output is a one state width (nominally 90 electrical degrees), high true index pulse which is coincident with the low states of channels A and B.
revolution. Pulse Width (P): The number of electrical degrees that an output is high during 1 cycle. This value is nominally or 1/2 cycle. Pulse Width Error ( P): The deviation, in electrical degrees, of the pulse width from its ideal value of 180°e. 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 The number of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. This value is nominally 90°e for quadrature output. Phase Error The deviation of the phase from its ideal value of 90°e.
Count (N): The number of bar and window pairs or counts per revolution (CPR) of the codewheel. One Cycle (C): 360 electrical degrees ( °e), 1 bar and window pair. One Shaft Rotation: 360 mechanical degrees, N cycles. Position Error ( The normalized angular difference between the actual shaft position and the position indicated by the encoder cycle count. Cycle Error ( C): An indication of cycle uniformity. The difference between an observed shaft angle which gives rise to one electrical cycle, and the nominal angular increment of a
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