HP 54501A - Falltime

FALLtime
FALLtime
command/query
Command Syntax:
Example:
Query
Syntax:
Returned
Format:
Example:
The :MEASURE:FALLTIME
command
places
the
instrument
in
the
continuous
measurement
mode
and
starts
a
Falltime
measurement.
The
FALLTIME
query measures
and
outputs
the
fall
time of
the
first
displayed
falling
(negative-going)
edge.
For
best
measurement
accuracy
set
the
sweep
speed
as
fast
as
possible
while
leaving
the
falling
edge
of
the
waveform on
the
display.
The
falltime
is
determined
by
measuring the
time
at
the
upper
threshold
of
the
falling
edge
then
measuring
the
time at
the
lower
threshold
of
the
falling
edge
and
calculating
the
falltime
with
the
formula:
fall
time
=
time
at lower
threshold
point
-
time
at
upper
threshold
point
If
the
horizontal
scaling
is
questionable
when
this
measurement
is
made
and
"error
11"
is
placed
in the
error queue.
:MEASure:FALLtime
OUTPUT
707;":MEAS:FALL"
:MEASure:FALLtime?
[:MEASure:FALLtime]
<valuexNL>
Where:
<
value
>
::
=
time
in
seconds
between
lower
threshold and
upper
threshold
voltage
points (exponential
-
NR3
format)
DIM
Rl$[50]
OUTPUT 707;":MEASURE:FALLTIME?"
ENTER
707;
Rl$
PRINT
Fll$
Measure
Subsystem
14-24
HP
54501A
Programming