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Mode
l
5528A
Squareness
M
easu
rements (In
a Vertica
l
Plane)
SECTION 13
SQUARENESS MEASUREMENTS
(IN A VERTICAL PLANE)
CONTENTS
INTR
ODUCTION
O
PERATING
SPEC
IFICATIONS
HARDWARE REQU IRED
REFEREN CE MATER
IAL
FIRS T-AX
IS MEASUREMENT
SECO
ND-AXIS
MEASU
REMENT
WHAT
AFFECTS
ACCU RACY?
INTRODUCTION
A
"Squareness" measu
rement
consists
of
two
Strai
ghtness measurements,
perpendicu
lar
to
each
other,
made
with a fixed
Straightness
Refl
ector. This
is typica lly
done by making
a
vertica
l
Straightness
measurement
along a
verti
ca
l
axis,
using
an Optica
l
Square,
a Turn ing Mir
ro r,
and
a
Straightness
Hetroreflector,
then
removing
these
Optics
and
making a vertical
Straightness
measurement
along
a
horizontal
axis.
This
process is
diagrammed
in Figure
13-
7.
NOTE
There are both a
Straightness
Reflector
<lnd a
Straightness Helro-
reflecto
r. In
this User's Guide
Section.
we
wil
l
try
to
always
type
"
Helrorefleaor" like
this,
with
the " Retro"
in
bold type,
to
emphasize when
that
is
the
o ne
th at
is
to be
used.
OPERATING SPECIFICATIONS
ACCURACY
Short
Range Optics
:
Metric
Units
M
o de: ±(O
.s
+
O
.1M
)
arc-sec
± 1%
o
f
0
English
Units
M ode:
±(O.5
+
O.03F
)
arc-sec
± 1%
of 0
Long
Range
Oplics:
M
etric Units
M
o de:
±(O.S
+
0.01M
)
arc-sec
± 2.5%
of
0
English
Units
M ode:
.1(0.5
+
0.OO3F
)
arc
-sec
..t
2.S'X,
of 0
where:
o
=
cdlculated
out-of-squ<lreness
ang
le in
(lrc-sec
M
=
distance of
trave
l
of
th
e
moving
optic
in
met res
=
distance of trave
l
of
Ihe
moving optic in
feet
F
13-1
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