
Test Plan Items
A-60
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
The rotary to linear Transfer Function is used when the manufacturer
provides specification for the linear motion of the contacts, however, the
mechanism accessible for the transducer connection is involved in a
rotary motion (Figure A.72). The rotary to linear Transfer Function is also
checked for the entry of a ratio that is too large.
Figure A.72 Transducer Wheel
The default value for a rotary to linear Transfer Function using English
transducer units is 1.00 in/50.00 deg.
The following is an explanation for the chosen default value.
The transducer wheel has a circumference of 5". Consequently, if the
Main Contact travel is such that the transducer wheel makes a full turn
(360 deg.), the rod pressing against the wheel would have moved 5".
If the transducer rod movement is the result of the wheel movement of
1 deg., the transducer rod traveled:
1 deg./360 deg. x 5" = 0.01389"
If the default Transfer Function value is 1"/1 deg., which seems logical,
the Transfer Function ratio is:
1"/0.01389" = 72, which is above the 50 that the Instrument uses as a
limit.
To bring the Transfer Function ratio into the more practical (and
allowable by the Instrument) range, the Instrument defaults to the
1"/50 deg., which results in the following ratio:
50 deg./360 deg. x 5" = 0.694", 1"/0.694" = 1.44
360°
5°
Main
Code
Wheel
Contact
Содержание TDR9000
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