Vrelative - HP 54501A Programming Reference Manual

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