More than 20 mu of F is measured with a digital multimeter capacitance

Measured with a digital multimeter is greater than 20 & mu; F the capacitance of

see more digital multimeter, its capacitance profile measured value maximum 20 & mu; F, sometimes can not meet the requirement of the measurement. To this end, can adopt the following simple method, use digital multimeter capacitance measuring more than 20 & mu; F the capacitance, maximum thousands of micro method of capacitance measurement. Large capacitance measurement by this method, the need for digital multimeter circuit to make any changes.

measuring principle of this method is based on two series capacitance formula string = C1C2 / C ( C1+C2) As the basic. Due to the size of two capacitors in series, the series after the total capacity of less than capacity of small capacity of the capacitor, therefore, assumes that the capacity of the capacitor under test beyond 20 & mu; F, simply with a capacity of less than 20 & mu; F capacitor in series, can be directly measured in digital multimeter. On the basis of two capacitors in series formula, simple/(C1 = C2C string is deduced C2 - C series) , use this formula to calculate the capacity of the value of the measured capacitance. Below for a test case, indicating the detailed method of using this formula.

element to be tested is an electrolytic capacitor, its nominal capacity is 220 & mu; F, set its for C1. Select a nominal value of 10 & mu; F electrolytic capacitor as the C2, choose digital multimeter 20 & mu; F the practice of the capacitance profile measured the capacitance value is 9. 5μ F, after the two capacitors in series, measure C series of 9. 09年μ F。 The C2 = 9. 5μ F, C = 9. 09年μ F generation into the formula, the C1 = C2C string/( C2 - C series) = 9. May 9. 09 / ( 9. 5 - 9. 09) ≈ 211 ( μ F)

note, no matter for what capacity selection of the C2, at less than 20 & mu; F selecting the capacity under the premise of larger capacitance, and the formula of the C2 should plug originally measured values, rather than the nominal value, which can reduce the error. Will two capacitance measured together with the digital multimeter, because of the capacity of capacitance itself error and measurement error, only measured values and calculated value can be thought to be almost capacitor C1 is good, according to the practice of C1 measurements can be further calculated capacity.

tell from actually, using this method can measure the capacity of arbitrary capacitance, but assuming the capacity of the capacitor under test is too large, the error will increase. The error is directly proportional to the size and the size of the capacitor under test.

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