HP 54501A - Error; Making Measurements

Measurement
Error
If
a
measurement
cannot
be
made,
typically
because
the
proper
portion
of
the
waveform
is
not
displayed,
the
value
returned
for
that
parameter
is
+
9.99999E
+
37.
This
is
an
error
value
that
is
output
when
a
measurement
cannot
be
made.
Making
Measurements
If
more
than
one
waveform,
edge,
or
pulse
is
displayed,
time
measurements
are
made
on
the
first
(left-most)
portion
of
the
displayed
waveform
that
can
be
used.
When
any
of
the defined
measurements
are
requested,
the
oscilloscope
first
determines
the
top
(100%)
and base
(0%) voltages
of
the
waveform.
From
this
information,
it
can
determine
the
other
important
voltage
values
(10%
voltage, 90%
voltage,
and
50%
voltage)
for
making
the
measurements.
The
10%
and
90%
voltage
values
are
used
in the
risetime
and
falltime
measurements
when
standard
measurements are
selected.
The 50%
voltage
value
is
used
for
measuring
frequency,
period,
pulse
width,
and
duty cycle
with
standard
measurements
selected..
The
measurements can
also
be
made
using
user
defined
parameters
instead of
the
standard
measurement values.
When the
command form
of the
front-panel
measurements,
preshoot,
or
overshoot
is
used
the
instrument
is
placed
into
the
continuous
measurement
mode.
When
the
query
form
of these
measurements
is
used
continuous measurement
mode
is
turned off,
the
measurement
is
made
one
time
and
the
measurement
result
is
returned.
Voltage
measurements
are
made
using
the
entire
display.
Therefore,
if
you
want
to
make
a
measurement
on
a
particular
cycle,
display only
that
cycle
on
the
display.
Measure
Subsystem
14-2
HP
54501A
Programming