General information is good. But I need to at least know max. valid ESR to draw certain conclusions.Always consult datasheet but this gives a general view
Do you know how to compute the ESR from the dissipation factor (tan δ)?General information is good. But I need to at least know max. valid ESR to draw certain conclusions.
In any case, thanks for the information.
And why consider 120Hz, if the datasheets indicate 100kHz?I would consider the ESR at 120 Hz. to be a practical maximum value. I'm not clear where the value of 0.004 Ω came from;
The value of the dissipation factor is given in the datasheet at a frequency of 120 Hz. At that frequency the reactance of your capacitor is less than 1 Ω. The reactance at 100 kHz will be 1.1 mΩ and the ESR will be a small fraction of that. You said you wanted a maximum value.And why consider 120Hz, if the datasheets indicate 100kHz?
The value of 0.004Ohm is measured at 100kHz.
The full CapXon catalog can be downloaded here: http://www.capxongroup.com/news_in.aspx?lc=1&mnuid=2078&modid=13&nid=271Datasheet.
1500uF not listed but approximating from the supplied data 0.004 isn't too far of the mark.
so the reactance of a cap is not the same as ESR . I was wondering why some of my calc's were so off. Is that because ESR is a measurement or model that includes inductance and resistance ?The value of the dissipation factor is given in the datasheet at a frequency of 120 Hz. At that frequency the reactance of your capacitor is less than 1 Ω. The reactance at 100 kHz will be 1.1 mΩ and the ESR will be a small fraction of that. You said you wanted a maximum value.
No it is not. Although the units are the same we are dealing with vectors. In the complex plane at low frequencies a capacitor has a small real real part and a large imaginary part. As the frequency increases the imaginary part goes asymptotically toward zero and apparently the ESR decreases as well for a while.so the reactance of a cap is not the same as ESR . I was wondering why some of my calc's were so off. Is that because ESR is a measurement or model that includes inductance and resistance ?
Is there a simple formula for ESR ? I have an LCR meter, I need to lookup how they actually work, and ESR
by Luke James