Falltime - HP 54501A Programming Reference Manual

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