CONTENTS
Model
5528A
Sq
uarcness
Measurements
(
In
A Horizonlal
Pl
ane)
SECTION
12
SQUARENESS
MEASUREMENTS
(IN
A HORIZONTAL
PLANE)
INTR
ODUC
TIO
N
OPE
RATING S
PE
CIFI
CAT
IO
NS
H
ARDWA
RE
REQU IR
ED
REFERENCE
MATERIAL
fiR
ST-AX
IS
MEASUREMENT
SECOND-AXIS MEASUREMENT
WHAT
AFFECTS
ACCURACY?
INTRODUCTION
A "Squarenes
s"
measuremenl consists
of
two
S
tr
aightncss measu
remen
ts,
perpendicu
lar to
each
ot
he
r, made with a fixed Straightness Re
fl
ec
tor. This is typically
done
by first making a horizontal
Suaightness measurement along
one
axis using an
Op
tical Squar
e,
then
removing
the
Optical
Square, moving the laser Head, and making a
hor
izontal
St
ra
ightncss meas
urement
alo ng
the
second
axis.
Th
is
process
is
diagrammed
in
Figure
12
-1.
Thi
s section is or
ga
nized
to
provide
in
structions for each
aIds
you sh
ou
ld
measure
to
compute
a
"Squareness". Separate procedures
aTC
provided for
the
"first-axis" measur
eme
nt and
the
"second-axis" measurement.
NOTE
There
ar
c both a Straig
htn
css Refl
ec
tor and a Straightness
Rctroreflector.
In
t
hi
s User's Gu
id
e Section. wc
wil
l try
to
always
type "Relroreflector" like this,
wi
th
Ihe
" Relr
o"
in
bold
type,
to
emphasize when that
is
the one that
is
to be used.
OPERATING SPECIFICATIONS
ACC
UR
AC
V
Sh
o
rt
Range Opt
ks
:
Metr
ic
Units M
ode
: ±(O.5 + 0.1 M) arc-sec
..t
l'
X,
of 0
Engl
is
h
Uni
ts
M
ode
:
±(
0.5 + 0.
03
Fl arc-sec
.!
1% of 0
Long Range Opti
cs
:
Metric Units Mode:
±(
0
.5
+
0.Q1
Ml ilK-sec .·
2.5
':%',
of
(J
Eng
li
sh Units Mode: i
(O.5
+
0.003
F) tlrc-sec !
2.5
9(
, of 0
where:
o
;;;
ca
lculated o
ut
-of-squarene
ss
<Ingle
in
arc-sec
M
=-
di
stance of Iravel of
th
e moving
op
ti
c
in
metres
F
=-
distance
of
travel of the moving o
pti
c
in
feet
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