Dataq DI-725/E User Manual Download

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DI–720/DI–722/DI–730 Series User Manual

Introduction

1. Introduction

Congratulations on your purchase of a DI-720, DI-722, or DI-730 Series data acquisition instrument. This manual
describes how to connect and use all of the instruments in the DI-720, DI-722, and DI-730 Series plus the available
accessories and expanders. Throughout the majority of this manual, enough similarity exists to describe all instru-
ments with the same procedure. The convention used to annotate this similarity is “DI-7xx Series.” In cases where the
resemblance is not the same, separate procedures/descriptions exist for each instrument.

Features

The DI-7xx Series has the following features:

•

All instruments connect to the printer port of any PC-compatible computer. Most communicate in standard,
bi-directional or EPP mode. Models DI-720-EN, DI-722-EN, and DI-730-EN add optional Ethernet commu-
nication. DI-720-USB, DI-722-USB, and DI-730-USB add optional USB communication.

•

Per channel software-configurable settings including input gain, sample rate, intelligent oversampling
modes (signal averaging, maximum value, minimum value, and last point), and single-ended or differential
input.

•

DI-720 Series Instruments offer 32 single-ended/16 differential (software selectable per channel) general
purpose inputs (±10V Full Scale).

•

DI-722-16 Series Instruments offer 16 fixed differential extended measurement range (±20V Full Scale)
inputs and 16 single-ended/8 differential (software selectable per channel) general purpose (±10V Full
Scale) inputs.

•

DI-722-32 Series Instruments offer 32 extended measurement range differential inputs (±20V Full Scale).

•

DI-730 Series Instruments offer 8 fixed isolated high voltage range (±1000V Full Scale) differential inputs
and 16 general-purpose (±10V Full Scale) non-isolated inputs (available through the

EXPANSION

(USB

and PP models) or

Channel Expansion

(EN models) connector on the rear of the instrument). General pur-

pose inputs are connected directly to a multiplexer. Each channel can be configured for single-ended or dif-
ferential operation on a channel-by-channel basis. General-purpose inputs can have gain factors of 1, 2, 4 or
8 applied on a channel-by-channel basis.

•

Ethernet Instruments provide synchronous distributed data acquisition through CAT-5 Ethernet cables (con-
nected through the

Expansion

port).

•

Flexible power requirements. All instruments operate from any standard 60Hz, 120V AC wall outlet with
the supplied power adapter. Alternately, you may power the instrument from any +9 to +36 volt DC source.

•

High sample throughput rates. The DI-720 can record at up to 200KHz throughput. The DI-722 Series can
record at up to 50KHz throughput. The DI-730 Series can record at up to 150KHz throughput. See “Analog
Inputs” on page 3 for full sample rate specifications.

•

Analog-to-Digital converters. DI-720 and DI-722 Series provide 16-bit A/D converters for high-resolution
measurement accuracy (14 bits maximum resolution using W

software). DI-730 Series provide a 14-

bit A/D converter.

•

Supports analog pre- and post-triggering of data acquisition based on the level and slope of a specified chan-
nel.

Analog Input

32 single-ended/16 differential analog inputs (on DI-720 Series instruments), 16 singled-ended/24 differential analog
inputs (on DI-722-16 Series instruments), 32 differential analog inputs (on DI-722-32 Series instruments) or 8 fixed