CA/04/V
2Pages

Catalog excerpts

SENSING ENGINEERING INNOVATION CA/04/V Charge Amplifier Velocity Converter 04 system Transducer interface converts; acceleration to velocity input range 1/100pC/g; O/Ps 100mV/g and 1V/mm.sec. (max) 1/100pC/g normalizing charge amplifier input section proceeds noise limiting 10Hz 4 pole high pass filter and single integrator. Integrator converts periodic acceleration above the filter corner frequency to velocity. Integrator gain is controlled over 50dB dynamic range by 6 position switch. CHARGE AMPLIFIER Provides wideband 100mV/g acceleration proportional output when normalized, transducer sensitivity range 1/100pC/g, by means of ten-turn dial and x1, x10 multiplier. Output is independent of transducer lead capacitance. CAL input terminal allows injection of test signal, 1mV = 1pC. HIGH PASS FILTER Noise level alter integration, hence the realizable signal threshold, is proportional to fmin -n, where fmin is the high pass filter corner frequency and n is a function of the noise type, being 1/2 for that predominating in FET input stage charge amplifiers at low frequencies (<100Hz). Spurious signals also emanate from the transducer and its cable resultant upon environmental factors, and these may be considered as introducing additional f-n noise components, subject to high pass filter constraint. HP filter corner frequency is thus the determinant of threshold velocity level. INTEGRATOR / RANGE AMPLIFIER Converts acceleration input to velocity output levels of 1316mm/sec/volt in six 10dB increments. Integrator bandwidth is controlled by the HP filter integrator frequency response constraints and ultimately background noise. Peak limiting input of around 120g pk. Equates to a velocity-frequency product (v x f) of 2 x 105mm/sec2 thus absolute constraints may be readily calculated. APPLICATIONS Confined to quasi steady state inputs as emanating from vibration on rotating plant, where vibration velocity is a more representative wide band signal than either acceleration (high frequency biased) or displacement (low frequency biased), allows retro-fit of piezoelectric accelerometers for velocity transducers. Integration of transient signals, i.e. to convert to velocity change, is invalid. DJB Instruments (UK) Ltd Finchley Avenue, Mildenhall, Suffolk IP28 7BG Email sales@djbinstruments.com Web www.djbinstruments.com A UK company with UK-based manufacturing, assembly and calibration in-house.

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SENSING ENGINEERING INNOVATION CA/04/V Charge Amplifier Velocity Converter 04 system Transducer interface converts; acceleration to velocity input range 1/100pC/g; O/Ps 100mV/g and 1V/mm.sec. (max) Single ended Input capacitance loading Normalising range Noise level @ 1pC/g, mm/sec. Rms scaling Finchley Avenue, Email sales@djbinstruments.com Mildenhall, Suffolk IP28 7BG Web www.djbinstruments.com A UK company with UK-based manufacturing, assembly and calibration in-house.

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