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282 Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Guide

5 Commands by Subsystem

:MEASure:FALLtime

(see page 658)

Command Syntax

:MEASure:FALLtime [<source>]

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

<n>::={1|2|3|4}forthefour channel oscilloscope models

<n> ::= {1 | 2} for the two channel oscilloscope models

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 272

• ":MEASure:RISetime" on page 294

• ":MEASure:SOURce" on page 297

NOTE

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

Agilent Technologies InfiniiVision 5000 Series Programmer's Guide

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