He states a bit later that ESR does depend on frequency, so his wording was a bit inconsistent. But his later statement is correct -- ESR depends on frequency in general, sometimes dramatically, depending on the type of dielectric, as well as on the voltage, temperature, neutron flux and local pizza density.
-- Cheers
Tom
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On 9/16/2024 9:02 AM, Frank Mashockie wrote:
"ESR is constant with frequency, D is not since it is a ratio of capacitive reactance to resistance and Xc is dependent on frequency"
Can you explain what you mean by ESR not being dependent on frequency? That doesn't seem right to me. You can easily test this by using a LCR meter and measuring the ESR at different frequency test values (100Hz up to 100kHz). You'll see that the ESR values change. I would assume that is why a test frequency (100kHz) is usually specified for reported ESR values.
-Frank
