Agilent Technologies InfiniiVision 3000 X-Series, Programmer'S Manual

Page: 402 / 1232

402 Agilent InfiniiVision 3000 X-Series Oscilloscopes Programmer's Guide
19
:MEASure Commands
:MEASure:FALLtime
(see page 1088 )
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><NL>
<value> ::= time in seconds between the lower threshold and upper
threshold in NR3 format
See Also
• "Introduction to :MEASure Commands" on page 388
• ":MEASure:RISetime" on page 418
• ":MEASure:SOURce" on page 421
N O T E
This command is not available if the source is FFT (Fast Fourier Transform).