NNNNNNNNNNNNNNNNNNNN
NORMAL
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
NOISE
ON
OFF
provides
an
external-noise-source
drive
voltage
for
noise
gure
measurements
.
When
the
function
is
switched
on,
a
+28
Vdc
output
is
sent
to
a
noise
source
drive
connector
on
the
front
panel
of
an
HP
70620B
preamplier
or
HP
70621A
preamplier
.
Functional
Type:
power-meter
Firmkey
A
ccess:
NNNNNNNNNNNNNNNNN
Amptd
Preset
State:
O
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
NORMAL
chooses
between
positive-
and
negative-peak
values
,
according
to
the
Rosenfell
algorithm,
which
tests
to
see
if
a
response
rises
and
falls
in
the
sampling
interval.
The
algorithm
translates
the
video
signal
as
seen
at
the
envelope
detector
from
analog
information,
that
is
,
continuously
changing
amplitude
values
,
into
digital
information
comprising
a
series
of
nite
data
points
.
The
translation
process
divides
the
analog
information
into
intervals
,
then
chooses
a
value
from
each
interval
as
the
data
point
(element).
The
result
is
a
combination
of
positive-
and
negative-peak
detection,
where
the
minimum
value
detected
in
one
interval
is
displayed
alternately
with
the
maximum
value
detected
in
the
previous
two
intervals
.
Signals
that
occur
within
the
interval
are
displayed,
even
if
they
occur
within
an
interval
that
displays
the
minimum
value
(as
a
result
of
negative-peak
detection).
Thus
,
broadband
or
impulsive
signals
less
than
an
interval
wide
are
captured
and
displayed.
Figure
4-7
illustrates
an
example
of
a
signal
measurement
using
the
normal
function.
Figure
4-7.
Measurement
Using
Normal-P
eak
Detection
Softkey
Descriptions
4-105
Summary of Contents for 70000 series
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