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LaserSpeed
Interfacing with the
Quadrature Outputs at Extremely Low Pulse Frequencies
Note: This section only applies to the pulse
The
resolution is used, the |
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| Pulse Frequency Error vs. Pulse Frequency |
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pulse output |
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frequency will be |
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frequency low enough | % | 6 |
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for the step size to | / |
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Envelope | 5 |
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cause noticeable |
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errors in | Error | 4 |
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measurement. The | Frequency |
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following graph shows | 3 |
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the envelope of the | Pulse | 2 |
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pulse output |
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frequency error as the |
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pulse output |
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frequency approaches |
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zero.
Pulse Frequency / Hz
The error decreases very rapidly as the frequency increases, becoming insignificant at pulse output frequencies higher than 15Hz. For this reason, the pulse output resolution should be set such that the minimum production line speed produces a pulse output frequency higher than 15Hz.
The following equations can be used to calculate the minimum pulse output resolution.
Definitions:
R = Minimum Recommended Pulse Output Resolution
X = Minimum Production Linespeed
Part No. 93463 / Drawing No. | Page 41 of 221 | Revision A (Sep 2007) |