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Model
5528A
Glossilry
PilCh
: Rotiltionill movement ilbout
a
side -to-side
horizon
tal axis.
Roll
:
Rotation
about a
lengthwise
horizonta
l
axis.
Rotation
(of the
laser I-lead): An angular adjustment of
the laser Head
's
orientation
to direct the
laser
beam
as
required for
your
measurement
.
Translation
(of
the laser Head
):
A st
raight-
line adju stment
of
the
laser
/-lead's
position
to
direct
the laser beam as required for
your
measuremenl.
Trigonomet
ry:
An angle of one degree
is an
angle
in
which
the ro tation is
11360 of one complete
rotation.
1 degree
=
60 arc-minutes
=
3600 arc-seconds.
A
waight angle
is
an angle
of
180°
(180 degrees
).
A
right
angle
is
an
angle of 90°C.
An acute angle
is
an angle between 0" and 90°.
An
obtuse
angle is
an
anglc between 90° and
180°.
The
Trigonometric
Functions
of an
Acute Angle
In
Ihe right
triangle
ABC.
sine A
=
sin A
=
al
e
cosine A
=
cos A
=
blc
tangent
A
=
tan
A
=
al
b
cosecant
A
=
c;c
A
=
ci
a
secant A
=
sec A
=
cl
b
cotangent
A
=
CO
l
A
=
ctn A
""
bl
a
B
c
a
A
~~--------~------~
C
b
Wavelength:
for light,
equal
to the
velocity
divided by the
frequency; units
are
distance-per-
cycle
(although the
"per-cycle"
is
normally omitted
).
Yaw:
Rotation about
a vertical axis.
G-3
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