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362 Keysight InfiniiVision DSOX1204A/G Oscilloscopes Programmer's Guide

20 :MEASure Commands

:MEASure:FALLtime

(see page 798)

Command Syntax

:MEASure:FALLtime [<source>]

<source> ::= {CHANnel<n> | FUNCtion | MATH | WMEMory<r>}

<n> ::= 1 to (# analog channels) in NR1 format

<r> ::= 1-2 in NR1 format

The :MEASure:FALLtime command installs a screen measurement and starts a

fall-time measurement. For highest measurement accuracy, set the sweep speed

as fast as possible, while leaving the falling edge of the waveform on the display. If

the optional source parameter is specified, the current source is modified.

Query Syntax

:MEASure:FALLtime? [<source>]

The :MEASure:FALLtime? query measures and outputs the fall time of the

displayed falling (negative-going) edge closest to the trigger reference. The fall

time 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 fall time with the following formula:

fall time = time at lower threshold - time at upper threshold

Return Format

<value> ::= time in seconds between the lower threshold and upper

threshold in NR3 format

See Also • "Introduction to :MEASure Commands" on page 350

• ":MEASure:RISetime" on page 377

• ":MEASure:SOURce" on page 380

NOTE

This command is not available if the source is FFT (Fast Fourier Transform).

Keysight Technologies InfiniiVision DSOX1204A User Manual

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