Rockwell Automation 1771-QB Linear Pos. - Manual (Page 33)

Hardware Description
Chapter 4
4Ć4
Use these equations to determine the maximum length and positioning
resolution for the transducer:
maximum length = 1680/(T x N)
resolution = 1/(58.5 x T x N)
where:
T = transducer constant stamped on transducer head (typically
9.0500 microseconds per inch)
N = number of circulations
The following table gives several maximum transducer lengths assuming a
transducer constant of 9.0500 microseconds per inch. Resolutions may be
limited by the physical capabilities of the transducer. See Chapter 8 for a
description of a procedure for verifying the transducer constant.
Number of
Circulations
Resolution
(Inches)
Maximum Transducer Length
(Inches)
1 0.002 185.6
2 0.001 92.8
3 0.0006 61.9
4 0.0005 46.4
5 0.0004 37.1
6 0.0003 30.9
7 0.0003 26.5
8 0.0002 23.2
9 0.0002 20.6
10 0.0002 18.6
Important: Apply a 10% to 20% margin when determining the maximum
transducer length. The available stroke length will be less than indicated above
due to the null space (typically 2 inches) near the transducer head.