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GURLEY Precision Instruments
A25S Absolute Rotary Encoder

A25S Absolute Rotary Encoder

Product catalog summary

Overview
The Gurley Model A25S Absolute Encoder is a high-performance optical encoder designed for industrial applications. It features high resolution, accuracy, and a compact design, making it suitable for tight spaces and high-speed operations.

Key Specifications

Resolution: Up to 17-bit (131,072 unique words per revolution)
Maximum Operating Speed: 600 rpm
Maximum Slew Speed: 10,000 rpm
Operating Temperature: Commercial (32°F to +158°F), Automotive (-40°F to +185°F)
Humidity: 98% RH, non-condensing
Shock and Vibration: 50 g, 11ms shock; 15 g, 0-2000 Hz vibration
Input Power: +5 Vdc ±0.25 Vdc, 300 mA max

Mechanical and Environmental Features

Rugged design with sealed ABEC 7 bearings
Code disc made of chrome on glass
Transducer IP40, Electronics IP60

Electrical Features

Output Code: Natural binary, parallel or serial format
Data Update Rate: 1 MHz parallel, 100 kHz serial
Output Format: TTL-compatible tri-state buffered registers

Performance and Accuracy

Multiple reading heads eliminate errors from disc eccentricity and pattern irregularities
Interpolation with high-speed phase-angle conversion circuitry
Zero-hysteresis feature for error-free bi-directional operation

Applications
The Model A25S is ideal for motion control applications requiring high resolution and accuracy, such as robotics, precision servo controls, radar pedestals, rotary tables, and machine tools.

Installation and Configuration

External electronics can be mounted using brackets or directly to a surface
Dip switches allow configuration of output settings
Performance certification ensures monotonicity and accuracy

Specifications and Features
The document provides detailed specifications for the Gurley Precision Instruments A25S absolute rotary encoder and the ASC3N serial interface card. The encoder operates with a maximum data update rate of 100,000 reads per second and requires a +5 Vdc power supply. It functions within an operating temperature range of 0°C to 70°C and can handle humidity levels from 0% to 90% non-condensing.

Electrical and Environmental Considerations
The encoder and interface card use RS-422 line drivers and receivers for serial data transmission. The ASC3N generates an active low interrogate pulse to initiate data conversion. The baud rate is adjustable between 28 kHz and 3.6 MHz, affecting the data update rate. The system supports data sizes from 14 to 17 bits with configurable parity.

Installation and Operation Recommendations
For optimal performance, it is recommended to use an LC filter to suppress RFI if the encoder shares a power supply with digital interfacing logic. Proper grounding of the instrument shield is advised to minimize interference. In environments with strong magnetic fields, careful cable routing and additional shielding are suggested.

Mechanical Specifications
The document includes detailed mechanical dimensions and tolerances for the encoder and optional shaft coupling. The encoder supports various shaft sizes and mounting configurations.

Ordering Information
Details on ordering configurations, including code, resolution, format, cable length, base, shaft size, package, temperature range, and special features, are provided. Accessories such as mating connectors and mounting brackets are available separately.

Special Capabilities and Warranty
Gurley Precision Instruments offers customization options for encoders to meet specific requirements, including higher frequency response and greater accuracy. A limited warranty covers defects in materials and workmanship for one year from the shipment date.

Catalog excerpts

Gurley Precision Instruments' Model A25S absolute optical encoder is unique with its advanced design featuring new encoder technology. The following features make it far more capable than competitive products: Faster and more accurate than either a resolver-based system, or any competitive optical encoder. Up to 17-bit resolution, the highest available in an encoder designed and priced for industrial applications. A rugged, compact transducer (2.5" dia x 1.25" long) makes the encoder easier to design into tight spaces. Fully accurate data at 600 rpm permits use at higher shaft speeds. Very high data update rate (1 MHz parallel, 100 kHz serial) allows the encoder to be used whenever "real time" data is needed, such as velocity feedback applications or wide-bandwidth positioning servos. Unique circuitry eliminates hysteresis deadband, so there's no error due to bi-directional operation. Natural binary bus-compatible output permits straightforward hardware and software interfacing. Optional interface card simplifies communication between the encoder and a computer. > Gurley Precision Instruments514 Fulton StreetTroy, NY 12180 U.S.A.(800) 759-1844, (518) 272-6300, fax (518) 274-0336, Online at www.gurley.com, e-mail: [email protected] ingenuity@work

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T 1 TT 2 T 3 T 4 TIME MIN MAX > INT T - T 100 ns > 10 T - T 500 ns > 20 REG CONVERSION IN PROCESSNEW READING T - T 750 ns > 30 OEDATA T - T 1 s > 40 HIGH-IMPEDANCE T - T > 32 100 ns T - T 250 ns > 43 T T 1 T 2 T 3 T 4 T 5 T 6 TIME MIN MAXT - T 00 ns > 10 123413141516 17PARITY T - T 900 ns > 20 DATA D16D15D14D13D12D3D2D1D0 T - T 100 ns > 43 T - T 100 ns > 65 12345151617CLKINTREAD 18 Complementary signals omitted for clarity Gurley Precision Instruments514 Fulton StreetTroy, NY 12180 U.S.A.(800) 759-1844, (518) 272-6300, fax (518) 274-0336, Online at www.gurley.com, e-mail: [email protected] >

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4.21 ASSEMBLY [7.6] > OPEN THIS SIDE ONLY MAX[106.9] > CUST MADE IN U.S.A.Troy, NY 518-272-6300 InstrumentsGurley Precision .093 [2.36].30 [7.6] > SERMODEL -.0005+.0000-.013+.000 1.23 DB-25P [31.2]DIA >

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USER END B 04E 1/4 shaft 05E 5/16Ԕ shaft 06E 3/8 shaft 06M 6 mm shaft 08M 8 mm shaft 10M 10 mm shaft > SPECIFICATIONS Kinematic accuracy with parallel offset = 0.1 mm[0.004 in] and angular misalignment = 0.09԰10 arcsec Torsional rigidity150 N m/rad[0.1in oz/arcs] Maximum parallel offset0.5 mm [0.020 in] Maximum axial extension or compression0.5 mm [0.020 in] Maximum angular misalignment1Ѱ 22 [.87] 9.53 [.375] 10 [.39] 10 [.39] 30[1.18]DIA SOCKET HEADCAP SCREWS(SEE NOTE 2) B (SEE NOTE 3) 1. DIMENSIONS ARE IN MM [IN]. 2. IF 踸B IS IN INCHES, SCREWS ARE 4-40 X 5/16.IF B IS IN MM, SCREWS ARE M3 X...

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CODE - PKG - Electronics package B Natural Binary PC board assembly only 1 With enclosure RES - Resolution, words/rev 17 2 (131,072) > 17 TEMP - Operating temperature range 16 2 (65,536) > 16 C Commercial (0 to +70C) 15 2 (32,768) > 15 A Automotive (-40 to +85аC) 14 2 (16,384) > 14 T Transducer only (-40 to +85C) FORMAT - Data transmission SF - Special feature S Serial, RS-422 diff. line driver # Issued at time of order to cover special customer requirements P Parallel, tri-state TTL N No special features CABLE - Cable length in inches 048 Standard 006 ACCESSORIES (order separately) Minimum 300...

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