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

32 :WAVeform Commands

Data Acquisition Types

There are four types of waveform acquisitions that can be selected for

analog channels with the :ACQuire:TYPE command (see page 239):

NORMal, AVERage, PEAK, and HRESolution. Digital channels are always

acquired using NORMal. When the data is acquired using the :DIGitize

command (see page 199) or :RUN command (see page 219), the data is

placed in the channel buffer of the specified source.

Once you have acquired data with the :DIGitize command, the instrument

is stopped. If the instrument is restarted (via the programming interface

or the front panel), or if any instrument setting is changed, the data

acquired with the :DIGitize command may be overwritten.You should first

acquire the data with the :DIGitize command, then immediately read the

data with the :WAVeform:DATA? query (see page 969) before changing any

instrument setup.

A waveform record consists of either all of the acquired points or a subset

of the acquired points. The number of points acquired may be queried

using :ACQuire:POINts? (see page 232).

Helpful Hints:

The number of points transferred to the computer is controlled using the

:WAVeform:POINts command (see page 972). If :WAVeform:POINts

MAXimum is specified and the instrument is not running (stopped), all of

the points that are displayed are transferred. This can be as many as

4,000,000 in some operating modes or as many as 8,000,000 for a digital

channel on the mixed signal oscilloscope. Fewer points may be specified to

speed data transfers and minimize controller analysis time. The

:WAVeform:POINts may be varied even after data on a channel is acquired.

However, this decimation may result in lost pulses and transitions. The

number of points selected for transfer using :WAVeform:POINts must be an

even divisor of 1,000 or be set to MAXimum. :WAVeform:POINts determines

the increment between time buckets that will be transferred. If POINts =

MAXimum, the data cannot be decimated. For example:

• :WAVeform:POINts 1000 — returns time buckets 0, 1, 2, 3, 4 ,.., 999.

• :WAVeform:POINts 500 — returns time buckets 0, 2, 4, 6, 8 ,.., 998.

• :WAVeform:POINts 250 — returns time buckets 0, 4, 8, 12, 16 ,.., 996.

• :WAVeform:POINts 100 — returns time buckets 0, 10, 20, 30, 40 ,..,

990.

Analog Channel Data

NORMal Data

Agilent Technologies InfiniiVision 3000 X-Series Programmer's Guide

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