Geokon 4200 Series Instruction Manual page 31

11) Combining the equations from steps nine and ten gives:
Where; (for Model 4200)
L is 5.875 inches.
w
L is 6.000 inches.
g
12*) Therefore:
13*) The display on position "D" of the readout is based on the equation:
The squaring, inverting, and multiplication by the factor 3.304×10
microprocessor of the readout so that the displayed reading on Channel D is given in
microinches per inch (
*Note that T is in seconds x 10
Alternatively;
ε
= 3.304 x 10 - 3 2
f microstrain.
Where f is the frequency in Hz.
ε
=
ε
= 3.304 x 10
ε
= 3.304 x 10
ε
).
and ε is in microinches per inch
6
3
97.75 L
w
∙
2
T L
g
� �
1
3
2
T
� �
9
1
2
T
9
is all done internally by the
25