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436 Agilent InfiniiVision 3000 X-Series Oscilloscopes Programmer's Guide

20 :MEASure Commands

:MEASure:PREShoot

(see page 1138)

Command Syntax

:MEASure:PREShoot [<source>]

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

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

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

The :MEASure:PREShoot command installs a screen measurement and

starts a preshoot measurement. If the optional source parameter is

specified, the current source is modified.

Query Syntax

:MEASure:PREShoot? [<source>]

The :MEASure:PREShoot? query measures and returns the preshoot of the

edge closest to the trigger, displayed on the screen. The method used to

determine preshoot is to make three different vertical value measurements:

Vtop, Vbase, and either Vmin or Vmax, depending on whether the edge is

rising or falling.

For a rising edge:

preshoot = ((Vmin-Vbase) / (Vtop-Vbase)) x 100

For a falling edge:

preshoot = ((Vmax-Vtop) / (Vtop- Vbase)) x 100

Vtop and Vbase are taken from the normal histogram of all waveform

vertical values. The extremum of Vmax or Vmin is taken from the

waveform interval right before the chosen edge, halfway back to the

previous edge. This more restricted definition is used instead of the

normal one, because it is likely that a signal may have more overshoot

than preshoot, and the normal extremum would then be dominated by the

overshoot of the preceding edge.

Return Format

<value> ::= the percent of preshoot of the selected waveform

in NR3 format

See Also • "Introduction to :MEASure Commands" on page 406

• ":MEASure:SOURce" on page 444

• ":MEASure:VMIN" on page 460

• ":MEASure:VMAX" on page 459

• ":MEASure:VTOP" on page 465

• ":MEASure:VBASe" on page 458

Agilent Technologies InfiniiVision 3000 X-Series Programmer's Guide

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