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Pacific Instruments unveils data acquisition systems

21 Apr 2016

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Pacific Instruments, a Vishay Precision Group, Inc. (VPG) brand, has revealed that it is providing two data acquisition systems (DAS) that expand the instruments product line of the Micro-Measurements brand. According to the company, the PI 7200 and PI 7300 DAS bring additional capabilities and levels of performance to transducer data acquisition in rugged applications such as wind tunnels, engine test stands, or wherever the DAS needs to be located on or near the test article.

Together, Pacific Instruments and Micro-Measurements make VPG a next-level one-stop supplier for stress analysis and strain measurement, with Pacific Instruments' advanced signal conditioning and data acquisition instruments complementing Micro-Measurements' industry- leading strain gage sensors and installation accessories for stress analysis and strain measurement.

Designed to reduce installation and test setup costs while improving signal quality and reliability, the 16-channel PI 7200 and PI 7300 function as Ethernet-connected appliances that condition, amplify and digitise outputs from strain gages, bridges, IEPE, or voltage transducers. Multiple units can easily be combined or distributed in larger installations. Features include real-time correction/compensation of gain offset and excitation voltage from -20°C to 50°C, quality signal conditioning with high gain, and a 24bit high-speed ADC per channel to provide high accuracy, high resolution, and high sample rate across a wide operating range.

PI 7200, PI 7300 DAS

The fully self-contained PI 7200 and PI 7300 provide transducer excitation, bridge completion and balance. The transducer output is amplified and filtered to remove signal components that could produce alias errors, and digitised to 24bit resolution. The digitised transducer output is digitally processed providing multiple sample rates, an 80dB/octave FIR filter, and a 32bit floating point output format in millivolts referred to input, millivolts referred to output, or user-defined engineering units. The PI 7200 and PI 7300 families support analogue bandwidth up to 50kHz, with gain from one to 1,000.

Each module has a Gigabit Ethernet interface for control and data output, which simplifies system wiring and provides remote and distributed operation. IRIG time base may be employed to synchronise sampling on multiple modules within 10 microseconds, or a TTL timing may be used to achieve better than 1μs time alignment. Multiple modules with up to 4,096 channels may be connected on a single Ethernet LAN.

Within the PI 7200 and PI 7300 families, additional model options are available for applications requiring voltage inputs (PI 7218 and PI 7318); programmable voltage excitation, bridge completion for 120Ω and 350Ω strain gages, shunt calibration, and automatic balance (PI 7216 and PI 7316); or regulated power for transducers with internal electronics (PI 7220 and PI 7320).

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