7
en
6.2 HOT KEY MENU
7 MEASUREMENTS AND THE MEASUREMENT SCREEN
7.1 QUANTITIES OF MEASUREMENT
Your gauge can measure using the following measurement quantities: Time (nanoseconds), Elongation,
Load, Stress and % Strain
The easiest and most fail safe of these quantities are Time and Elongation.
Note: If Load, Stress, or % Strain are to be used on a regular basis, a calibration of the bolts for the specific
application is required.
The equations which follow outline the factors and constants necessary for each measurement quantity:
You should be aware of the possibility for errors to occur when using these measurement quantities:
•
When measuring in terms of Time and Elongation, very little information is required, as the
measurement is simply a difference equation. The stress factor and velocity will typically not vary more
than 5%, in total, over the entire range of possible steel fasteners. Therefore the worst case error is
5%.
•
When measuring in terms of Load, Stress, or % Strain however, the error can be enormous if errors in
effective length, load factor, or cross sectional area are made. These factors will result in proportional
errors overall. Therefore, if the load factor is in error by 10%, the load measurement will also be in
error by the same 10%.
Press MEAS once to
access the
measurement screen.
The hot menu functions
are displayed at the
bottom of the reading
screen.
Press MEAS to scroll
right along the hot menu
functions and ESC to
scroll left.
Use UP, DOWN, LEFT
and RIGHT to adjust the
value of the function.
Alternatively, adjust
values by pressing
ENTER then use UP,
DOWN, LEFT and
RIGHT to scroll and
adjust values. Press OK
when finished.
Elongation
Load
Stress
% Strain
where:
= Elongation
= Sonic Stress Factor
= Material Velocity
= Change in Time
where:
= Load
= Elongation
= Load Factor
= Load Offset
where:
= Stress
= Load
= Cross Sectional
Area
where:
= % Strain
= Elongation
= Effective Length
X
E
S
F
( )
V
0
( )
[
]Δ
T
=
P
X
E
(
)
L
F
( )
L
o
+
=
S
P
A
---
=
S
N
X
E
L
E
------
⎝ ⎠
⎛ ⎞
100
×
=
X
E
S
F
V
0
Δ
T
P
X
E
L
F
L
o
S
P
A
S
N
X
E
L
E
