Mo
del 5528A
V.O .
L.
Compensat
io
n Factor
SECTION 19
V.O.L. COMPENSATION FACTOR
CONTENTS
IN
TR
ODUCTI
ON
WHAT IS
THE
V.
O.l.
COMPE
NSA
TI
ON
FA
CTOR?
COMPE
NS
AT
IO
N
FA
C
TOR
FOR
"S
TA
NDARD" C
ONDIT
I
ON
S
HOW
DO
YOU
DETERMINE
THE
V.
O .
l.
COMPENS
AT
I
ON
FACTOR?
H
OW
DO YOU
EN
TER
THE
V.D.
L.
C
OMP
ENS
AT
I
ON
FAC
TOR
?
INTRODUCTION
You need to kn
ow
the informat
io
n pr
ese
nted in this
Use
r
's
Guide section o
nl
y if both of the
foll
ow
ing are true -
1.
Yo
u
ar
e making a
o;
stance or Veloc
it
y meas
ur
ement, and -
2. You
ar
e not using an air
se
nsor with yo
ur
la
se
r
Me
as
ur
ement
Sys
tem.
If
you
ar
e
not
making a Distance or
Vel
ocity meas
ur
ement, or if
yo
u are using
an
air
se
ns
or
with
your
la
se
r M
eas
ur
ement
Sys
tem, you do nol need to know the in
fo
rm
ation
pr
ese
nted in this
Use
r
's
Guide section.
If
you are using an Air
Se
ns
or
with your l aser Meas
ur
ement
Sys
tem, the co
mp
en
sa
t
io
n
num
be
rth
at
is n
ee
ded will be updated continuously and e
nt
ered automatically.
WHAT
IS
THE
V.O.L. COMPENSATION FACTOR?
The
la
se
r M
eas
ur
ement
Sys
tem works by co
untin
g wavelengths of the l
aser
b
ea
m
as
the various
m
eas
ur
ement opti
CS
ar
c moved. The waveleng
th
, frequen
cy
, and
ve
locity of light are related
as
foll
ows
-
wa
velength (per cycle) =
ve
l
oc
ity
frequency
The
ve
locity
of
light is constant in a vacuum, but
va
ri
es
in air
as
a funct
io
n
of
the a
ir
's
te
mp
erature,
pr
ess
ur
e,
and humidity. Sin
ce
the frequen
cy
of the laser is held co nstant, the wavelength of its light
will
va
ry
as
the light's
ve
locity v
ari
es,
and this varia tion in w
av
elength wilt affect yo
ur
measurement
s.
A one·part-
pe
r-miltlon
va
riation in
th
e
ve
locity of
li
ght c
an
result from any one of the following -
• a 1-degrcc C (2-degree F) change in air temperatu
re,-
• a 2.S-mm (0.1- inch) (
of
merc
ur
y) change in air p
ress
ure, -
•
an
80% c
ha
n
ge
in relative humidity.
The distan
ce
sh
ow
n on the Meas
ur
ement
Di
splay unit at any time is equal to th e
pr
oduct of the
l
ase
r wavelength (in un
its
of " mitiimetr
es
" or "
in
ch
es
" ) tim
es
the
num
ber of wa
ve
lengths counted
since
R
ES
ET
was l
as
t
pr
esse
d. In prac
ti
c
e,
this produ
ct
operation is done in t
wo
step
s.
First, the
19-1
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