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However, shaft seals can be a source of heat generation, so designers must verify limits with the manufacturer. Its good practice to choose an encoder that will read two to four times better resolution than the machinerys maximum error source. System operating speed is usually known or dictated by tradeoffs such as system throughput versus scrap rates. Inherent errors in a system will limit resolution. Its dictated by the type of output driver (line driver, open collector, or push-pull hybrid), cable length and type, and controller-end terminations.