,
Mode
l 5528A
Angular
Mea
sure
me
n
ts
CONTENTS
SECTION 8
ANGULAR MEASUREMENTS
INTROD
UC
TION
OPERATING
S
PECI
FI
CAT
I
ONS
HARDWARE
REQ
UI
RED
I{ELATED
MEASUREMENTS
REFEREN
CE
MATERIAL
INSTAllATIO
N AND ALIGNMENT
OF
OPTICS
M[ASUREMENT DIS
PLAY
SE
IT
I
NGS
MAK
I
NG
A
M[A
SU
REMENT
WH
AT
AFF[C
TS
ACCU
RA
CY?
INTRODUCTION
An
,.
An~lIIM"
mea
su
rement
is
the
mC;l
s
ur
ement
of
the relative angul
ar
mo
vement bctween the
Re-
flector .tnd the Interferometer as one of them is moved.
See
Appendix A for a de
sc
ription
of
the
principles on which
this measuremcnt
is
ba
sed
.
OPERATING
SPECIFICATIONS
ACCURACY: Angle measurements arc accurate within ±
0.
:n6
of
di
sp
layed
va
lue
±0.
05
ar
c-sec
per
metr
e
of
traveled distance
of
the m
ov
ing optic.
This a
ss
um
es
that all angl
es
greater than ±
3600
arc--sec
h
ave
been
corrected, the Reflector
is
aligned within
10
arc-min using autor
cfl
ec-
lion
techniques, roll alignment by t
he
operator is within 1 degree rela-
tive
to the measurement plane, and the temperature
of
all
optical
components is stabilized in the range 15-
2S°C.
RESOLUTION: 0.1 arc-
sec
RANGE:
±3600
0 arc-
sec
AXIAL
SE
PARATION:
(Typi
ca
l, with proper alignment, 15- 25"C, distan
ce
between the
la
se
r
Head
and the Reflector.)
15
metr
es
(
SO
fee
l)
HARDWARE
REQUIRED
In addition to the hardware requir
ed
for
any
measurement using the
La
ser Measurement System
(
see
Fjgure
4-1
).
any
Angulal
mea
s
ur
ement requir
es
the hardware sh
own
in Figure
8-1
.
"-1
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