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The impedance of the 1 nF capacitor, Z1nF, is measured using the LCR meter with the scaling ratio set to 1.0, yielding Z1 nF_LCR, shown in Eq. (3). And finally, the impedance of the 1 nF standard is measured using the capacitance bridge, yielding Z1 nF_CB, shown in Eq. (4). The scaling ratio, K, is calculated from the described measurements.
While the 100 pF and 1 nF air capacitors have insignificant dissipation factors over the frequency range of interest, their capacitance is not particularly stable (typically 30 parts in 106 per degree C).
Table 16. Combined standard uncertainty of scaling ratio for 10 nF capacitor, in parts in 106. (*) The asterisk indicates a measurement using 4TP air capacitors and its capacitance is obtained from measurement at 1 kHz and extrapolation to 100 kHz. The uncertainty of the measurement procedure is 13 parts in 106.
A 10 nF nitrogen dielectric capacitor with short-term stability of better than 1 part in 107 was measured using the NIST 4TP Bridge and the capacitance scaling system. A summary of the results is shown in Table 20. Table 20. 10 nF capacitor measurements at several frequencies, in parts in 106.
Capacitor markings are used for identifying their values and proper usage in electronic circuits. Here's a detailed breakdown of the key aspects to consider: On smaller capacitors, you often find only the capacitance value. For larger capacitors, two main parameters are displayed: capacitance and breakdown voltage.