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REACTANCE CHART
Always
obtain approximate value from Figure
7
before using Figure
2
3
4
5
F R E Q U E N C Y
Example: The point indicated i n Figure 1 corresponds
to a frequency of about 700 kHz and an inductance of
500 +H, or a capacitance of 100 pF, giving i n either case
a reactance of about 2000 ohms. The resonant frequency
of a circuit containing these values of inductance and
capacitance is, of course, 700 kHz, approximately.
USE OF FIGURE 2
Figure 2 gives additional precision but does not place
the decimal point, which must be located from a prelim-
FIGURE
2
inary entry on Figure 1. Since the chart necessarily
requires two logarithmic decades for inductance and ca-
pacitance for every single decade of frequency and reac-
tance, unless the correct decade for L and C is chosen,
the calculated values of reactance and frequency will be
i n error by a factor of 3.16. In Figure 2, the capacitance
scale is red; inductance scale is black.
Example: (Continued) The reactance corresponding to
500 +H or 100 pF is 2230 ohms at 712 kHz, their reso-
nant frequency.
APPENDIX
7
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