HP 54501A - Envelope

AveraQC
Average
data
consists of
the
average
of
the
first
n hits
in
a
time
bucket,
where
n
is
the
value returned
by
the ACQUIRE:COUNT
query.
Time
buckets
that
have
fewer
than
n
hits
return
the
average
of
what
data
they
do
have.
If
the
:ACQUIRE:COMPLETE
parameter
is
set
to
100%
then each
time bucket
must
contain
the
number
of
data
hits
specified
with the
:ACQUIRE:COUNT
command.
Again,
if
a
time
bucket
doesn't
have
any
data
in
it,
it
will
return
-1.
This
data
is
transmitted
over
the
HP-IB
in a
linear
fashion
starting
with
time
bucket
0
and
proceeding
through
time
bucket
n-1,
where
n
is
the
number returned
by
the
WAVEFORM:POINTS
query.
The
first value
corresponds
to
a
point
at
the
left
side
of
the
screen
and
the
last
value
is
one
point
away
from
the
right
side
of
the
screen.
Envelope
Envelope
data consists
of
two
arrays
of
data,
one
containing
the
minimum
of
the first
n
hits
in
each
time
bucket
and
the
other
containing
the
maximum
of
the
first
n
hits
in
each
time
bucket, where
n
is
the
value
returned
by
the
ACQUIRE:COUNT
query.
If
a
time bucket
does
not
have
any
hits
in it,
then
-1
is
returned
for
both
the
minimum
and
maximum
values.
The
two
arrays
are
transmitted
one
at
a
time
over
the
HP-IB
linearly, starting
with
time
bucket
0
(on
the left
side
of
the
CRT)
and
proceeding
through
time
bucket
m-1,
where
m
is
the
value
returned
by
the
WAVEFORM:POINTS
query.
The
array
with
the
minimum
values
is
sent
first.
The
first
value
of each
array corresponds
to
the
data
point
on
the left
of
the
CRT.
The last
value
is
one
data
point
away
from
the
right
side
of
the
CRT.
The
data
is
transferred
from
the
channel
buffer
to
a
controller
using
the
WAVEFORM:DATA
query.
Data
is
transferred
into
the
instrument
from
a
controller
using
the
WAVEFORM:DATA
command.
Envelope
data
can
be
transferred into
Waveform Memories
1
and
3,
ifWMEMORY
1
is
specified
as
the
source,
or Waveform Memories
2
and
4
if
WMEMORY
2
is
specified
as
the
source.
The
data
is
then
transferred
as
two
arrays.
If
Waveform
Memory
1
is
specified
as
the
source,
the
first
array
is
transferred
into
Waveform
Memory
1
and
the
second
array
is
transferred
into
Waveform
Memory
3.
If
waveform Memory
2
is
specified
as
the
source,
the
first
array
is
transferred
in
Waveform
Memory
2
and
the
second
array
is
transferred
into
Waveform
Memory
4.
The
data type
is
then
changed
to
normal
for
each
of
the
waveform
memories.
HP
54501A
Programming
Waveform Subsystem
17-3