HP 54501A - Vrelative

VRELative
VRELative
command/query
The
:MEASURE: VRELATIVE
command
moves
the
voltage
markers
to
the
specified
percentage
points
of
their last established
position.
The last
established
position
is
not
necessarily
on
the
currently
displayed
waveform.
For
example,
after
a
:MEAS:VAMPLITUDE?
query
has
been sent
VMarker
1 is
located at
the
base
(0%)
of
the
signal
and
VMarker
2
is
at
the
top
(100%)
of
the
signal.
If the VRELATIVE
10
command
was
executed,
VMarker
1
is
moved
to
the
10%
level and
VMarker
2
to
the
90%
level
of the
signal.
Any
value
between
0%
and
100%
can
be
used.
If VRELATIVE
0
is
sent
the
markers
are
not
moved,
because
the
command
indicates
0%
movement
from
the
current
position.
As
an
example,
when
the
following
values
are
sent
the
markers
are
moved
to
the
following
percentage
values
of their
current
position.
10
moves VMarker
1
to
10%
and
VMarker
2
to
90%
20
moves VMarker
1
to
20%
and
VMarker
2
to
80%
50
moves
both
markers to
50%
80
moves
VMarker
1
to
20%
and
VMarker
2
to
80%
90
moves
VMarker
1
to
10%
and
VMarker
2
to
90%
The
starting position
of
the
markers must
be
known
for
this
command
to
be
meaningful.
The
markers
can
be
set
to
a
known
position
on
the
selected
waveform
using
the
:MEAS:VAMPLITUDE?
query.
The
VRELATIVE
query returns
the
current
relative
position
of
VMarker2
which
is
always
in
the
range
50%
through
90%.
Note
The VRELATIVE
command
does
not
affect
the
upper
and
lower
thresholds
selected
by
the
UPPER
and
LOWER
commands.
Measure
Subsystem
14-58
HP
54501A
Programming