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CONTENTS
Model
5528A
Squarcn
ess
Measurements
(In
A
Horizonlal
Pl
ane)
SECTION 12
SQUARENESS MEASUREMENTS
(IN A HORIZONTAL PLANE)
INTR ODUCTIO
N
OPE
RATI
NG
SPECIFICATIONS
H
ARDWA
RE
REQU
IRED
REFERENCE MATERIAL
f
iRST-AX IS
MEASUREMENT
SECOND-
AX
IS
MEASUREMENT
WHAT AFFECTS ACCURACY?
INTRODUCTION
A
"Sq uareness"
measuremenl
consists of
two
Straightncss measuremen
ts,
perpendicu
lar to each
o
ther,
made
with
a
fixed
Straightness
Re
fl
ector.
This is
typically done by first making
a
horizontal
Suaightness
measurement along
one axis
using
an
Optical
Square,
then removing the Optical
Square, moving the
l aser
Head, and
making
a horizontal Straightncss
measurement
alo ng
the
second
axis. This process is
diagrammed
in
Figure
12-1.
This sect
ion
is
o rga nized to provide
instru
ctions fo
r
each aIds you shou
ld
measure
to compute a
"Sq uareness"
.
Separate
procedures aTC
provided for
the
"first-ax
is"
measurement and the
"second-axis"
measurement.
NOTE
There
arc bot
h
a
Stra ightncss
Refl
ector
and
a Straightness
Rctroreflector.
In
this
User's
Gu
id
e Section
.
wc wil
l
try
to always
type
"
Re
lroreflector"
like this,
wi
th
Ihe
"
Rel ro"
in bold type, to
em phasize when that is
th
e o ne
that
is
to
be
use d.
OPERATING SPECIFICATIONS
ACCUR
AC
V
Sho
rt
Range Optks
:
Metric Units Mode
:
±(O.5
+
0.1
M)
arc-sec
..t l'X,
of
0
English
Units Mode
:
±(0.5
+
0.03
Fl
arc-sec
.!
1%
of
0
L
o ng
Range
O
ptics
:
Metric Units
Mode
:
±(0.5
+
0.Q1
Ml
ilK-sec
.·2.5' : %' ,
of
(J
English
Units
Mode
:
i
(O.5
+
0.003
F)
tlrc-sec
!
2.59(,
of 0
where:
o
;;;
ca
lculated
out-of-squareness
<Ingle
in
arc-sec
M
=-
distance
of
Iravel
of the
moving
optic
in metres
F
=-
distance of
travel
of
the
moving
o ptic
in feet
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