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Application Briefs and PapersBelow is a growing list of an application briefs and papers related to Precision Filters' products and technologies. Documents have a brief description or an overview, click the 'more' button to view full PDF document. Papers
Other Information SourcesLDTEDS: A Method for Long Distance Communication to Smart Transducers with TEDSThe IEEE 1451.4 standard defines a Mixed-Mode Interface (MMI) that is alternately used for both Transducer Electronic Data Sheet (TEDS) data and analog signals. For some sensors such as IEPE accelerometers, the TEDS contains essential data pertaining to the transducer that the connected system may read via the same wires that the analog signal is delivered. Presently, the distance between TEDS transducers and the interrogating instrument is limited to 400 feet due to communication protocol and design of the 1-wire memory devices. In many shock and vibration test applications, safety, environment or other factors dictate that the cable runs to the transducers are in excess of 400 feet. In this paper, we present a method that we call Long Distance TEDS (LDTEDS) that allows instruments to communicate with TEDS equipped devices to 1500 feet.
Balanced Constant Current Excitation for Dynamic Strain MeasurementsBalanced constant current excitation uses a pair of matched constant current sources to excite a single active strain gage. The technique provides enhanced immunity from electrostatic noise pickup and may be employed for dynamic strain measurement applications that require only two wires to the transducer. In this paper, the properties of balanced constant current excitation will be examined and compared against traditional techniques using the Wheatstone bridge or single-ended constant current excitation. A method to verify transducer health and cabling will also presented.
Aliasing and Anti-Alias FiltersThe analysis of continuous analog signals by digital signal processing equipment requires that the analog signal be converted into a sampled, digitized record of finite length.
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