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HP 8642A - Page 123

HP 8642A
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Model
8642A/B
Operation
Amplitude
Sweep
(cont'd)
2)
Calculate
the
sweep
step
size
automatically
selected.
The
result
can
be a
non
-integer,
but
actual
am
ph
tude
POll1ts
are
truncated
to
0.1
dB
(the
total
number
of
points
is
equal
to
the
total
number
of
steps + I).
The
sweep
step
size is
the
maximum
of:
0.1 dB
or
I
Start
Amplitude
(in
dBm) - Stop Amplitude
(in
dBm) I
[INTEGER
OF ( Sweep
~ir:es
(in
ms) ) - 1]
3)
Calculate
a sweep
time
that
could
be selected
for
a desired
number
of
steps.
3a)
First
you
must
ensure
that
the
desired
number
of
steps
is
between
the
maximum
and
minimum
number
of
steps
possible.
The
maximum
number
of
amplitude
steps
is
equal
to:
I
Start
Amplitude
(in
dBm) - Stop Amplitude
(in
dBm) I
0.1 dB
The
minimum
number
of
amplitude
steps
equals
the
minimum
of:
5
or
I
Start
Amplitude
(in
dBm) -
Stop
Amplitude
(in
dBm) I
0.1 dB
3b)
If
the
desired
number
of
steps
is
equal
to
the
maximum,
use a
sweep
time
setting
(in ms)
equal
to
or
greater
than
the
result
of
the
following
equation:
(Number
of Steps + 1) X 3 ms
If
the
desired
number
of
steps is less
than
the
maximum
calculated
in
3a, use a
sweep
time
setting
(in ms)
greater
than
or
equal
to
the
result
of
the
above
calculation
but
less
than
the
result
of
the
following
calculation:
(Number
of
Steps + 2) X 3 ms
3-87

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