tailieunhanh - Handbook of Industrial Automation - Richard L. Shell and Ernest L. Hall Part 4

Tham khảo tài liệu 'handbook of industrial automation - richard l. shell and ernest l. hall part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | C F J-4 4 2ĨĨ 2tr i kHz F Zs-Xl kHz pF 5 fF 0 0225 pF 10k Component values from Table 4 ate normalized to I rad s with resistors taken as 1 12 and capacitors in farads. The filter IS then frequency-scaled by dividing the capacitor values from the table by the cutoff frequency in radians 2a X 1 kHz . The filter ts finally impedance-scaled by multiplying the resistor values by a convenient value 10 k and dividing the capacitor values by the same value. Figure 4 Butterworth lowpass filter design example. Table 5 Filter Passband Errors Frequency Amplitude response A f Average filter error fiiter FS f fc 1-pole RC 3-pole Bessel 3-pole Butterworth 1-pole RC 3-pole Bessel 3-pole Butterworth 0 0 0 0 0 0 0 Copyright 2000 Marcel Dekker Inc. factor 1 2 for n identical signal conditioning channels combined. Note that Fdiff and may be present in any combination of de or rms voltage magnitudes. External interference entering low-level instrumentation circuits frequently is substantial especially in industrial environments and techniques for its attenuation or elimination are essential. Noise coupled to signal cables and input power buses the primary channels of external interference has as its cause local electric and magnetic field sources. For example unshielded signal cables will couple 1 mV of interference per kilowatt of 60 Hz load for each lineal foot of cable run on a 1 ft spacing from adjacent power cables. Most interference results from near-field sources primarily electric fields whereby the effective attenuation mechanism is reflection by a nonmagnetic material such as copper or aluminum shielding. Both .

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