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Dakota Ultrasonics
adjusted, approximate length already entered, and the MAX II is currently setup
and ready to measure in elongation mode.
2) Apply a drop of couplant to the bolt or transducer, and attach it to one end of
the bolt. Rotate the transducer clockwise and counter clockwise applying a
small amount of pressure to eliminate any excess couplant between the
transducer and bolt. Be sure to always place the transducer in the same
location. This will help to eliminate any potential measurement errors
caused by changing the sound path.
3) Record the ultrasonic length "L
temperature - 48
4) Repeat step 1 - 3 at the target temperatures (T
and 108
ultrasonic lengths (L
for each of the sample bolts in the experiment.
5) Use the equation below to calculate a linear regression, using the
temperatures and lengths recorded for all the sample bolts to determine the
temperature factor.
x = temperature, y = change in reference length, n = number of sample points per bolt
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0
F.
0
F (other similar range with 5 temperatures), measuring the
through L
1
Temperatur
eFactor
GlobalTestSupply
www.
" of the sample bolt at the above minimum
0
through T
1
) respectively. This process must be done
5
x
y
xy
n
2
x
2
x
n
86
) – 48, 68, 88,
5
6
10
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