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0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Time (sec) Figure 18. Unit-step-time responses of a second-order system with various damping ratios. The maximum overshoot, delay, rise, settling times, and frequency of oscillations depend on the damping ratio. A smaller damping ratio gives a faster response but larger overshoot. 707 is preferred. 0 ω u= ωn 1. They have a wide frequency range from zero to very high values. Steady accelerations can easily be measured. 2. Acceleration is more frequently needed since destructive forces are often related to acceleration rather than to velocity or displacement.
Some circuits provide a buffered square-wave output that can directly be interfaced digitally. In this case the need for analog-to-digital conversion is eliminated, thus removing one of the major sources of errors. In other types of accelerometers signal conditioning circuits such as analog-todigital converters are retained within the chip. Dout Din SCLK CS Figure 22. A block diagram of an accelerometer combined with microcontroller unit (MCU). The signal-conditioning, switching, and power-supply circuits are integrated to form a microaccelerometer.
805-581-3985 or 800-581-0701 Fax: 805-583-1526 PCB Piezoelectronics, Inc. : 617-237-6020 Fax: 508-651-9762 such that the vibrations measured will be less than 1 dB in linearity. It should be noted that an accelerometer’s useful frequency range is significantly higher, that is, to one-half or two-thirds of its resonant frequency. The measurement frequencies may be set to higher values in applications in which lower linearity (say 3 dB) may be acceptable as in the case of monitoring of internal conditions of machines since the reputability is more important than the linearity.