Fluke 831 User Manual page 100

On-board help
Mark a reference position on the machine close to the shaft and in line with a convenient
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external reference or flange bolt. Likewise, mark a reference point on the shaft.
Measure the circumference of the shaft and divide by eight.
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Use this distance to make seven more evenly-spaced marks on the shaft. Begin at your
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chosen start point. Number the points counterclockwise as seen from sensor to reflector.
Begin with 0 first, followed by 1:30, 3:00,4:30, 6:00, 7:30, 9:00 and 10:30.
For circular housings, measure the circumference of the machine coupling housing and divide
by eight. Use this distance to make eight evenly-spaced marks on the housing. Begin at your
chosen start point. Number the points clockwise looking down onto the shaft with 0 as the
first, followed by 1:30, 3:00,4:30, 6:00, 7:30, 9:00 and 10:30.
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