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ADXRS150 Folha de dados(PDF) 10 Page - Analog Devices |
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ADXRS150 Folha de dados(HTML) 10 Page - Analog Devices |
10 / 12 page ADXRS150 Rev. A | Page 10 of 12 sensing rate. Application notes outlining continuous self-test techniques are also available on the Analog Devices website. Acceleration Sensitivity The sign convention used is that lateral acceleration is positive in the direction from Pin Column A to Pin Column G of the package. That is, a device has positive sensitivity if its voltage output increases when the row of Pins 2A–6A are tipped under the row of Pins 2G–6G in the earth’s gravity. There are two effects of concern, shifts in the static null and induced null noise. Scale factor is not significantly affected until the acceleration reaches several hundred m/s2. Vibration rectification for frequencies up to 20 kHz is on the order of 0.00002(°/s)/(m/s2)2, is not significantly dependent on frequency, and has been verified up to 400 m/s2 rms. Linear vibration spectral density near the 14 kHz sensor reso- nance translates into output noise. In order to have a significant effect, the vibration must be within the angular rate bandwidth (typically ±40 Hz of the resonance), so it takes considerable high frequency vibration to have any effect. Away from the 14 kHz resonance the effect is not discernible, except for vibration frequencies within the angular rate pass band. This can be seen in Figure 9 to Figure 14 for the various sensor axes. The in-band effect can be seen in Figure 24. This is the result of the static g-sensitivity. The specimen used for Figure 24 had a g-sensitivity of 0.15°/s/g and its total in-band noise degraded from 3 mV rms to 5 mV rms for the specified vibration. The effect of broadband vibration up to 20 kHz is shown in Figure 23 and Figure 25. The output noise of the part falls away in accordance with the output low-pass filter and does not contain any “spikes” greater than 1% of the low frequency noise. A typical noise spectrum is shown in Figure 26. TIME – Seconds 2.50 2.52 2.54 2.56 0 24 6 8 10 2.58 2.60 Figure 23. Random Vibration (Lateral) 10 kHz to 20 kHz at 0.01 g/ √Hz with 60 Hz Sampling and 0.5 Sec Averaging TIME – Seconds 2.50 2.52 2.54 2.56 0 24 6 8 10 2.58 2.60 Figure 24. Random Vibration (Lateral) 2 Hz to 40 Hz, 3.2 g rms TIME – Seconds 2.50 2.52 2.54 2.56 0 24 6 8 10 2.58 2.60 STATIC 0.8mV rms SHAKING 2.4mV rms Figure 25. Random Vibration (Lateral) 10 kHz to 20 kHz at 0.01 g/ √Hz with 60 Hz Sampling and 0.5 Sec Averaging FREQUENCY – Hz –130 –110 –120 –100 –90 0 10 100 1000 10000 100000 –80 –70 –60 Figure 26. Noise Spectral Density at RATEOUT –BW = 4Hz |
Nº de peça semelhante - ADXRS150 |
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Descrição semelhante - ADXRS150 |
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