Mode
l 5528A
Squareness M ea
su
rements (In a Vertical Plane)
SECTION
13
SQUARENESS
MEASUREMENTS
(IN
A
VERTICAL
PLANE)
CONTENTS
IN
TR
ODUCT
I
ON
OPERATING S
PEC
IFICATIONS
HARDWARE REQUI
RED
REFEREN
CE MATERI
AL
FIRST-AXIS MEASUREMENT
SECO
ND
-
AXIS
MEA
SU
REMENT
WHAT
AFFECTS
ACCU
RA
CY?
INTRODUCTION
A
"S
quareness" mea
su
rement consists of two Straightn
ess
m
eas
urem
ent
s,
perpendicul
ar
to each
other, made with a fixed Straightn
ess
Reflector. This is typi
ca
lly
done
by making a vertical
Straightne
ss
m
eas
urement along a
ve
rti
ca
l axi
s,
using
an
Optical
Sq
uare, a Turning
Mir
ror, and a
Straightne
ss
He
tr
oref
lector, then removing these Optics and making a vertical Straightne
ss
mea
surement along a horizontal
axis
. This process
is
diagrammed in Figure
13
-
7.
NOTE
There are both a
St
raightn
ess
Refle
cto
r
<lnd
a
St
raightn
ess
He
lro
-
reflecto
r.
In this User's
Guide
Sec
tion. we will try to al
ways
type
" He
lr
orefleaor" like th
is,
with the " R
etro"
in
bo
ld type, to
emphasize when that is the one that is to be u
se
d.
OPERATING
SPECIFICATIONS
ACCURACY
Short
Ran
ge
Opti
cs
:
Metric
Unit
s M ode:
±(
O.s + O.
1M
) arc-sec ± 1% of 0
English Units M ode:
±(
O.5
+ O
.03F
) arc-sec ±1%
of
0
Long
Ran
ge
Oplics:
Metric
Unit
s M ode:
±(
O.S
+ 0.01M) arc-
sec
±
2.5
%
of
0
English
Unit
s M ode:
.1(
0.5
+
0.OO3F
) arc-
sec
..t
2.S
'X
,
of
0
where:
o
= cdlculated out-of-squ<lreness angle in (lrc-sec
M =
di
stance
of
tr
ave
l
of
the
moving
opti
c in m
et
r
es
= distance
of
tr
ave
l
of
Ihe
mo
ving
op
tic in feet F
13-1
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