Agilent Technologies Infiniium 8000A, Programmer'S Reference Manual

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Measure Commands
RISetime
RISetime
Command :MEASure:RISetime [<source>]
The :MEASure:RISetime command measures the rise time of the first displayed
edge by measuring the time at the lower threshold of the rising edge, measuring
the time at the upper threshold of the rising edge, then calculating the rise time
with the following algorithm:
Rise time = time at upper threshold point
−
time at lower threshold point.
To make this measurement requires 4 or more sample points on the rising edge
of the waveform.
Sources are specified with the :MEASure:SOURce command or with the
optional parameter following the RISetime command. With standard thresholds
selected, the lower threshold is at the 10% point and the upper threshold is at
the 90% point on the rising edge.
<source>
{CHANnel<N> | FUNCtion<N> | WMEMory<N>}
<N>
is an integer, 1 - 4.
Example
This example measures the rise time of the channel 1 waveform.
10 OUTPUT 707;":MEASURE:RISETIME CHANNEL1"
20 END