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DT expands its USB data-acq module family

Posted: 24 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:data acquisition? data translation? dt9834? usb module? dt9834-32?

Data acquisition equipment vendor Data Translation (DT) announced a new version of its DT9834 series of USB modules. We recently reviewed other box- and board-level versions of these nifty 32-channel systems here at eeProductCenter. Judging by enthusiastic reader response to those announcements and related I/O products, it's a certainty that USB is really gaining favor for data-acq and control.

With this product roll-out, DT is offering the DT9834 functions in yet another packaging scheme, with two package options, and the same variety of configuration options as the predecessor products.

For its part in this growing family, the new DT9834-32 offers 32 analog-input channels running at an aggregate throughput rate of 500kHz, and using USB v2.0 (high speed USB; 480Mbps). "That's something not possible until today," said Fred Molinari, the company's president and CEO.

Screw-terminals or embedded
Molinari indicates the DT9834-32 will be available in two configurations: STP and OEM. A DT9834-32-0-16-STP lets you make your signal connections to a built-in screw-terminal panel, housed in a rugged metal enclosure. For its part, a DT9834-32-0-16-OEM version of the module offers you an embedded version for inclusion in your own end product.

Either way, a DT9834 series provides data conversion at 16bit resolution, ensuring precision measurement of dynamic signals. Three analog-input configurations are possible: 32 single-ended/16 differential channels, 16 single-ended/8 differential channels, or no analog inputs.

Single-ended channels are useful when you're measuring high-level signals, when noise isn't significant, when the source of the input is close to the module, and when all the input signals are referred to the same common ground.

You can also use a pseudo-differential mode. Pseudo-differential channels are useful when noise or common-mode voltage exists, and when the differential configuration isn't suitable for your application. It does, however, imply less noise rejection than a differential configuration, but more analog input channels are available.

Alternatively, you can use differential inputs. This is useful if you want to measure low-level signals, when noise might be a significant part of the signal, or when common-mode voltage exists.

All input signals are MUXd to a single ADC (you can optionally choose models for either 12bit resolution or 16bit resolution).

Four programmable gain settings are also selectable (unity, 2, 4 and 8). These gain settings support input signal ranges of 1.25V, 2.5V, 5V and 10V.

By configuring each analog input channel for the input range that you want, you can connect many output transducers directly to one of these modules.

Digital I/O, counters
The modules also offer digital I/O, which is useful for time stamping, pattern recognition, and synchronization of external events.

You also get five independent, 32bit up/down counter timers; these can be clocked synchronously with the analog inputs, or independently to provide period measurements and pulse-width measurements. Synchronous operation of all subsystems also supports high-speed control loops, using analog and digital I/O as well as counter-timer operations simultaneously.

The system also supports continuous pulse stream output, one-shot, repetitive one-shot, and up/down counting operations. Flexible clocks and triggers provide control over signal acquisition/generation. Lastly, the new DT9834-32 also includes secondary power and USB connectors.

Software support
The DT9834-32 ships with the company's DT-Open Layers device drivers, Ready-to-Measure applications, and an evaluation copy of DT Measure Foundry, Data Translation's application builder package.

The DT9834-32-0-16-OEM and DT9834-32-0-16-STP are priced at $1,765 and $2,455, respectively, and are available immediately.

- Alex Mendelsohn

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