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Mod el
5528A
V.O.l.
Compe
nsati on
Factor
19-4
Where PABS is
the absolute
pressure
.
and
PADJ is the
adjusted
pressure.
Note that the altitude of the weather
stat
ion
is
not
considered
here,
sin
ce
the
number
they
report
has alread
y bee
n
corrected
to
sea leve
l
by
the
station.
3.
USE
OF COMPENSATION
CHARTS
In
most
cases, you will find
the
velocity-of-light
compensation number
thaI
is
to
be
entered
manually
so
mewhere in
Table
19-3
through Table 19-52.
If
you
ca n't
find your
measurement
conditions
in
any of
these tables,
you
will
have
to
calcu
late the compen sation
factor.
Instructions for
doing
this
are presented
below.
The v.o.l.
compensation
value
tables are divided into
a
" metric"
group (Table
19-3
through Table
19-27),
and an
"English"
group
(Table 19-28
through Table
19-52).
This is done as a convenience for
you, since
the
V.O.l.
com
pensation number
is
a
ratio
(without
units)
that
is
the
same,
regardless of
the measurement system
you are
using.
Table
19-3
and
Table
19-28
are wide-range
charts
offering
coa
rse
compensation
numbers
for
non-
precision
measu rements.
Table
19-4
through
Table
19-27,
and Table
19-29
through
Table 19-52 are
more-detailed
charts,
progressing
from
" low"
to
"
high"
altitudes, and from
" low" to " high"
relative humidity
.
To find the
V.O.l. appropriate
compensation factor
table, refer
first
to
Table
19-210 find
the
group
of
tables
for
your
humidity
and
altitude.
Then look
at
the
headings
for
those
tables
to
find
the
one
for
your
temperature range. You 'll find the
co
mpensation number
where
the row
and
column for
your
measurement
conditions
intersect. If the table
you
should be using doesn't have the
exact
value
for
your
measurement
,
you
can
ca
lcu
late
the value
you
need
by
interpolating between the
values
given
.
Table
19-2.
Guide to Compe/1sation
Tables
Re lative
Altitude
Table
Number
Humidity
Ki
l
llge
Metric
English
(NO
TE 1)
(NOTE
2)
50%
Wide
J
lB
20%
low
4-7
29-32
20%
Hi
gh
8-
"
33-36
50%
low
12-
15
37-40
50%
Hi
gh
16-
19
41
-
44
60%
l
ow
20-
23
45--48
60%
High
24-27
49-
52
NOTES
1.
" low"
altitude
-
720-800
mm
Hg,
27-31
in
Hg
"
Hi
gh" alTitude
,..
640-
720
mm
Hg.
23-27
in Hg
2.
For
complete table
reference
dc~ignation
,
add
"Table 19-"
to number listed
below.
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