By D. J. Dewhurst (Auth.)
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Additional resources for An Introduction to Biomedical Instrumentation
C. voltmeter in the circuit of Fig. 12. Bridge methods cannot easily be used to measure the capacitance of electrolytic capacitors; these are tested by observing their time constants of discharge, in conjunction with known resistors. ) Longmans, London, 1969. Manufacturers' literature on capacitors. 1 Set up the charging circuit of Fig. 13, using for C a combination of polyester or oil-impregnated capacitors of at least 10 μ¥. When ready, close the switch and plot the charging current as a function of time.
Voltage on capacitor. where / is the current in amperes, ê the rate of rise of voltage in volts per second, and the constant C is the capacitance of the capacitor. If a current of 1 ampere causes a rate of rise of 1 volt per second in a particular capacitor, that capacitor is said to have a capacitance of 1 farad. The farad is in practice a very large amount of capacitance; the usual 6 12 units employed are the microfarad (μ¥, 1 0 ~ farad) and the picofarad (pF, 1 0 " farad). 9 The nanofarad (nF, 1 0 ~ farad) is also found.
11, Ζ must be determined by suitably combining the individual impedances of C and R. As explained 55 CAPACITANCE SOURCE OF ALTERNATING CURRENT F I G . 11. Capacitor and resistor in series. 12) where Z c = l/2nfC. To determine the phase of the current flowing in terms of the source voltage, we can argue that if R alone were present, the current would be in phase with the voltage; if C alone were present, the current would be in quadrature with the voltage with its peaks occurring 90° earlier than those of the voltage.