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Model
5528A
Glossary
G-2
Fa
r End o( Travel
: The point
in your
measurement
setup when
the
Oplics are al
their (arlhest
distance
apart
during a
measurement.
H8:
symbol
for the cht!mical
element Mercury.
laser,
LASER
: An
acronym
of
"
light
AmplificaTion caused by
the
Stimulated Emission of
Radiation".
Also,
the devi
ce
that
produces light
usinglhis effecl.
LEO
(Lighl-Emilling Diode):
A semiconductor
device
thai
emits light when
the correct 'milage
is
applied.
Microinch
:
One
millionth
of an inch
.
Micromelre: In this
User's Guide, one
millionth
of a
metre,
or
one
thousa
ndth
of a
millimetre
(mm
).
Another
name for
micrometre is
Micron
.
Near End of Travel:
The point
in
your measurement
setup where
your OptiCS
are as dose as
they
will ever
be during a measurement.
Parls-per-million
("ppm"):
a
means
of
standardizing a changing
quantity by
comparing some
number
of
your measurement unit
s
against one
million
of
those
units
(sari
of a high-resolution
"percentage" ).
To use
"ppm", multiply
the
va
lue preceding
the expression
by the number
of mil
lions
over which
it app
lies.
For
example,
if
your
measurement
error
is
"10
ppm", and
your
measurement length
is
"
100
mm"
(4
inches),
then
your error wi
ll
be
-
100 mm
x
10 mm
1000 mm
=
0.(X)1000
mm
=
1 million mm
1 million
or
4
inches x
lOin
40
inche~
=
0.000040
inch
1 million in
1 million
To give you an
idea
of
how
sma
lllhi", quantit
y can
be. 1
ppm is -
One
inch
in
about
15.8
miles
One
seco
nd
in about
11
.6 days
One
pound
in the weight of about 6500 people
One
car-
length
in
the
distance
from s..n
Francisco
10
New York
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