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Digitizers allow long recordings at high sample rates

Posted: 15 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Strategic Test? digitizer cards? UF2 series? PCI-X card?

Strategic Test Corp. has released three new digitizer cards. Based on the UF2 series PCI-X (66MHz/32bit PCI) carrier card, the three models are available in 2-, 4- and 8-input channel configurations. Standard signal memory is 64MByte but this can be expanded to 4GBytes, allowing long recordings at high sample rates. The cards are supplied with drivers for Microsoft Windows and Linux, with free downloads of future OS version drivers such as Windows Vista. Drivers for MATLAB, LabVIEW, VEE, DASYLab and LabWindows/CVI are available as cost-options.

Each input channel has its own ADC and amplifier, the company said, ensuring true simultaneous recording on all channels and allowing the user to program the input voltage range and dcV offset to best match each sensor. Up to 16 cards can be configured as a synchronous system of up to 128 channels, sharing a common internal or external clock. It is possible to set trigger conditions on multiple cards combined with AND/OR, a feature often used in production test processes. Apart from the external trigger that is standard on all UF2 cards, each channel can be programmed with edge, window, slope and pulsewidth triggers. A Re-Arm trigger condition has been introduced on the UF2 series that reduces the possibility of false triggering on noisy signals, Signal Test explained.

A number of application specific cost-options are available. Multiple recording uses a memory segmentation technique to allow recording of a high-speed series of RADAR signals. Gated sampling only records when the external Gate TTL signal supplied by external equipment goes high or low. The ABA mode was known on traditional transient recorders, but until now has not been available on PCI cards. Introduced in the UF2 series, it allows a slow and fast sampling rate to be defined so that memory is conserved prior to the trigger event and the critical signal recorded at the faster required sampling rate, the company said.

Engineers who need to record high-speed digital signals for synchronization with the analog can use the Fast Digital Inputs option that adds 4 TTL input lines to each A/D channel, and records them at the same sample rate. The BaseIO option is most often used to control external equipment or to read and write status signals. It adds 8 TTL lines programmable directionally in two 4bit groups. Finally, the Timestamp option is used to record the time that each trigger occurs, but can also be fed with a GPS time signal to synchronize multiple cards operated at different locations.

These cards are available immediately and are priced at $4,154.90 (2-channel); $5,455.89 (4-channel); and, 9,240.31 (8-channel). Volume discounts and OEM customization prices are available on request.

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