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S PECIFICATIONS I NPUT D IFFERENTIAL BUFFERED SINUSOIDS Use with encoder modelVL18 linear; Vx20, Vx35 rotary Max code length on disc or scale12 bits (4096 cycles). See encoder data sheet. Interpolated resolution2 or 8 bits (4 or 256 steps per optical cycle) Max final resolution20 bits (1,048,576 steps) Absolute outputNatural binary byte-wide multiplexed Max input frequency10 kHz disc/scale data rate Max update rate (see note 1)At least 1 MHz, user dependent. See timing diagram. Auxiliary output (see note 2) Quadrature square waves plus index at disc/scaleresolution Max input cable length (see note 3)50 ft (15 m) Operating temperature range Standard (commercial) Optional (automotive)0°C to 70°C-40°C to +85°C ( INTERP = 02 only) Weight, oz (g) PKG = 0 (board only) PKG = 1 (board + mounting plate) 0.9 (26)2.1 (60)
3.1 (88) PKG = 2 (fully enclosed Notes:1. At maximum speed, the Virtual Absolute encoder + VF encoder is system may have an LSB rate up to 6.4 MHz. Due to dynamic effects, the lowest 2 or 3 bits may not be accurate. However, accuracy returns as the encoder slows down again, and no "counts" are lost because a not an incremental encoder. See the Model VF Interpolating Decoder User's Manual for a more thorough explanation of effective resolution versus speed - Gurley's "automatic transmission" for high resolution industrial encoders.2. This output is not for determining position and is not guaranteed to change synchronously with the absolute output. It is provided to simplify closing the velocity loop as required by some servo systems. Quarter-cycle gated index is active only after encoder initialization.3. Recommended maximum includes +5V power and assumes proper grounding, industrial shielding, and cable routing. Longer runs are possible, depending on the EMI environment. Encoder-to-decoder cable runs over 99 inches require signal extension cables, ordered separately. As part of our continuing product improvement program, all specifications are subject to change without notice. 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: info@gurley.com Page 2 of 8V3.1 VF GPIGPI IIIIIIIIIIIIII
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