Sonin DT220, Reference Manual

Page: 4 / 15

- 9 -
KEY PAD INFORMATION
7 2ND
Circle is used to find the circumference
and area of a known diameter of a circle.
4 2ND
Arc is used to find the length of an arc
after diameter and angle are entered.
2ND 2
Fixed Fraction mode is used to select a
desired fraction result.
Triangle Keys
Pitch
Pitch is used to calculate the pitch (slope)
of a right triangle. Once pitch entered
continued pressing of pitch key will cycle
through Angle, Rise and Ratio.
Run
Run is used to enter or calculate.
To calculate the run, you must enter any
two of the following: rise, pitch, diagonal
(length).
Rise
Rise is used to enter or calculate.
To calculate the rise, you must enter any
two of the following: run, pitch diagonal
(length)
/ 2
/ 64
- 10 -
KEY PAD INFORMATION
Diag
Diagonal /Length is used to enter or
calculate. To calculate the diagonal/length,
you must enter any two of the following:
Rise, Run, Pitch.
Diag 2ND
Raked Wall is used to figure stud lengths
in a raked wall. Given pitch, rise and/or
run continuous pressing of Rake function
will show descending stud lengths.
H/V
Hip/Valley is used to find the lengths of
regular or irregular hip/valley rafters.
When used alone it shows the regular
hip/valley length. If an irregular pitch [2ND]
[H/V] is entered first, then the irregular
hip/valley will be shown.
H/V 2ND
Irregular Pitch is used to change the
regular pitch value for determining lengths
of irregular hip/valley and jack rafters.
To recall press [2ND] [H/V]
Jack
Jack is used once the length of the Hip
(or valley) is found. Continuous entry will
display the descending sizes of the jack
rafters until “0” is displayed. These
calculations will use a standard on center
stud spacing of 16" unless otherwise
specified. To change the OC default enter
desired dimension prior to pressing [Jack] .
- 11 -
KEY PAD INFORMATION
Jack 2ND
Irregular Jack is used once the length of
the Hip(or valley) rafter is found.
Entry of [2ND] [Jack] followed by
successive entry of [Jack] will display
the descending sizes of the irregular hip
(or valley) until “0” is displayed.
Continuing to press [Jack] will show the
display the regular jack rafters.
Rise 2ND
Stair is used to calculate the number or
risers, actual riser heights, riser
under/overage, number of treads, tread
overage/underage, stringer/carriage and
inclination angle-Rise and/or Run is
required. The default riser height of 71/2"
can be changed by pressing desired height
followed by [2ND] [Rise] .
Run 2ND
Tread is used to calculate the width of the
tread. The default tread width of 10" can
be changed by pressing desired width
followed by [2ND] [Run] .