
Description
How Does
the
HP 3048A Compute Integrated Noise?
The software routine begins
by
storing
the
marked spurs within
the
specified start
and
stop frequency range.
The
marked spurs
are
then
removed from
the
noise data.
(A
linear connection
is
made between
the
data points
in the
area where each spur
was
removed.)
The
remaining
measured noise data
is
converted
to
noise power
and
integrated between
the specified start
and
stop frequencies. When the integration
is
complete,
the marked spurs are added to the integrated noise as discrete powers.
The
Definite Integral solution
is
then displayed
for the
Data Type selected.
The Definite Integral Value
is
computed
by the HP
3048A using
the
following summation:
Y^GpowenU)
x
Hz/Bin
where
:
fi
=
frequency from
'a
(start)
to '6
(stop)
Bin
=
Analyzer span resolution.
and
:
^
J,
power{fi)
—
10
1°
2
r
s^(/i)i
10
I*
foi
£(/)■
for 5*(/).
10 i« xff
10
10
for
SAf)-
irrier freq. ^
for S
y
(f).
Integr Noise 4-7
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