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Mod el
5528A
V.O .L.
Compensat ion
Fac
to
r
SECTION 19
V.O.L. COMPENSATION FACTOR
CONTENTS
INTR
ODUCTION
WHAT
IS
THE
V.O.l. COMPENSATION
FACTOR
?
COMPE
NSATION
FACTOR FOR "STA
NDARD"
CONDITIONS
HOW DO
YOU
DETERMINE THE V.O .l. COMPENSAT ION FACTOR
?
HOW
DO YOU
ENTER THE V.D .L. COMPENSAT ION FACTOR
?
INTRODUCTION
You need
to know the
information presented in
this User's Guide
section only
if bot
h
o
f
the
following are
tru
e
-
1.
You
are maki ng a
o;stance
or
Velocity measurement
,
and
-
2.
You
are
not
using
an air
sensor
with your laser
Meas
urement
System.
If you
are
not
making a
Distance or
Vel
ocity
measuremen
t,
or
if you are
using
an air sensor with
your
laser M easurement
System,
you d
o
nol
need
to know the
information presented in
this
User's
Gu
ide
section.
If you
are using
an Air
Sensor
with
your
l aser
Measurement
System,
the
compensation num
berthat
is
needed
will
be
updated
continuously
and entered
automatically.
WHAT IS THE V.O.L.
COMPENSATION
FACTOR?
The laser M easurement System
works by counting
wavelengt
hs
of
the laser bea
m
as
the vari
ous
measurement
optiCS arc moved. The
wavelength,
freq
uency,
and
velocity of
light
are
related
as
follows
-
wavelength (per
cycle) =
velocity
frequency
The velocity of light
is
constant in a
vacuum,
b ut
va ries
in air
as a
function
of the
air's
temperat ure,
pressure,
and
humidity.
Since the frequency o
f
the
laser
is
held
co
nstant,
th
e wave
length
o
f
its
light
will
va ry as the light's velocity
vari
es, and
thi
s
varia
tio
n in wavelength
wilt affect
your
measurements.
A
one·part-per-miltlon
va
riation
in
the veloci ty o
f li ght can
result
from
any
one
o
f
the follow
ing
-
•
a
1-
degrcc C (2-degree
F)
change
in air temperatu
re,-
•
a
2.S-
mm
(0.1- inch)
(of
mercury)
change
in air
pressure,
-
•
an
80%
change
in
relative
humidity.
The dista nce
shown
on the Measurement
Di
splay
unit at
any time
is
equal
to
th
e
product
of the
l aser
wavelengt
h (in un
its
of
" mitiimetres"
or
"
inches"
)
times the
num ber
o
f
wavelengths cou
nted
since
RESET
was
last
pressed.
In
practice, this prod uct
operation
is
do ne
in
two steps.
First
, the
19-1
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