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D.2 Speed Accuracy
The 6440 Indexer generates step pulses by initializing a
counter with a value that generates interrupts at approximately
the desired step rate. The counter runs at a frequency of
1.2288 MHz. This value is divided by the desired step rate to
yield the integer counter initialization value. Consequently,
the rounding process results in reduced accuracy as speeds
increase. For example, step rates from 2498 to 2502
steps/second yield a 491 count value and result in an actual
speed of 2503 steps/second. Likewise, 2503 to 2507
steps/second yield a 490 count and result in an actual speed of
2508 steps/second. In summary, speed accuracy over the full
20-19,000 step/second range is approximately 0.72 %.
D-6
MA6440
6440 User Manual - Rev 2