Check-line MINI-MAX Operation Manual page 101

3) Record the ultrasonic length "L
minimum temperature - 48
4) Repeat step 1 - 3 at the target temperatures (T
0
88, and 108 F (other similar range with 5 temperatures), measuring the
ultrasonic lengths (L
done 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.
Temperatur
x = temperature, y = change in reference length, n = number of sample points per bolt
MINI-MAX Ultrasonic Bolt Tension Monitor
" of the sample bolt at the above
0
0
F.
through L ) respectively. This process must be
1 5
(
∑
∑
−
xy
=
eFactor
∑
∑
−
2
x
through T ) – 48, 68,
1 5
)( )
∑
x y
n
∗
6
10
( )
2
x
n