8B33 isolated analog signal conditioner
Nov 17, 2009
8B33 isolated analog signal conditionerThe 8B33, designed for measuring True RMS values of input signals, is part of the family of miniature SensorLex 8B isolated analog signal conditioners. Each 8B33 True RMS input module accepts a single channel of AC input, which is converted to its True RMS DC value, then filtered, isolated, amplified, and converted to a standard process voltage or current output. RMS, or Root Mean Square, is a key measurement of an AC signal. It is the equivalent DC signal that produces the same amount of heat in a given load, therefore, it directly relates to signal power. For purely sinusoidal signals, the RMS value is the familiar peak amplitude divided by the square root of two. For signals comprised either of harmonics or of noncoherent content, this expression becomes increasingly invalid as the harmonic content or noncoherency increases. With these types of signals, therefore, the value is typically given in terms of a waveform¡¦s Crest Factor, which is the ratio of its peak amplitude to RMS amplitude. Crest factors start at one for DC or square waves and increase for more ¡§pointed¡¨ signals. By reducing the dependency on sinusoidal purity, True RMS conversion allows accurate measurement of signals ranging from pulses to complex nonperiodic waveforms. The conversion core circuit used in the 8B33 is similar to those found in high-end digital voltmeters. Like all modules in the SensorLex 8B family, the 8B33 is fully encapsulated and thus able to withstand harsh environmental conditions while providing fully functional Instrument Class performance. Originally developed in response to customer requests worldwide for smaller, lower cost isolated signal conditioners, the SensorLex„¥ 8B is housed in a miniature 1.11¡¨ x 1.65¡¨ x 0.4¡¨ (28.1mm x 41.9mm x 10.2mm) module. The product line now includes 19 family groups with a total of 123 different models.
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