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How To Read Capacitor Values3/30/2021
Many experts recommend replacing all Black Beauties with modern capacitors.It is time-consuming, but if, for example, one is determined to keep an instrument as original as possible, the following sequence of steps will find most of problems with black beauty capacitors.
If, at any step, the measurements are bad, the capacitor is bad and it should be replaced. Read Capacitor Values Series With TheAttach a sensitive ammeter in series with the power supply and the capacitor, and bring the power supply up to operating voltage of the capacitor. If it is outside the original tolerance range, it should be replaced. Calculate the frequency at which the reactance of the capacitor should be 0.1. Read Capacitor Values Generator To ThatSet a 50 signal generator to that frequency and an amplitude of 1 V. Probe the voltage across the capacitor with a good oscilloscope. There should be less than 100 mV of AC voltage across the capacitor. These instruments supply up to 600V DC (IT-11) and indicate the leakage current in a Magic Eye Tube.
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