Why do you want to measure ESR? Are you trying to locate bad electrolytic capacitors on a computer motherboard? Or do you have another reason?Hello everyone:
How to measure Capactive's ESR vaule with 10KHZ signal?
Is there any method or datasheet which I can refer to?
Best regard
I don't think this is going to work. You have created a voltage divider, but the output isn't loaded down by just the capacitors ESR; it's loaded by the series combination of the capacitor reactance plus the ESR. This method assumes that the reactance of the capacitor is much less than the ESR so that the loading effect is due only to the ESR.Hmm, lightning hits twice... I just posted a method for someone else here.
Dang, you're right, Electrician. I've used the method at 10-100 kHz and it works fine, but it could have a problem at 60 Hz or so. Still, if the ESR is an order of magnitude or more higher than the reactance, you'll see little voltage drop and it might be a clue that the cap is bad.I don't think this is going to work.
If you use a frequency of 60 Hz, even a large electrolytic (that is not defective) will have a reactance much larger than its typical ESR. The disparity will be even worse for small capacitors such as a typical film capacitor.
For example, a 10,000 uF capacitor from my parts bin has a measured ESR of 25 mΩ but has a reactance of 265 mΩ.
Hi, I just want to know how does the LCR Meter measure ESR?Why do you want to measure ESR? Are you trying to locate bad electrolytic capacitors on a computer motherboard? Or do you have another reason?
Dear someonesdad, I have read the essay that you posted.Hmm, lightning hits twice... I just posted a method for someone else here.
The principle is easy to describe. This type of meter:Hi, I just want to know how does the LCR Meter measure ESR?
I try to figure out the principle of it.
How do I search the related data from the internet?
Thank you!
Dear Electrician.The principle is easy to describe. This
use the following technique:
The meter applies a sinusoidal current (at 10 kHz or some other frequency also can be used) to the capacitor and then measures the voltage across the capacitor. The ratio of voltage to current (E/I) gives you the magnitude of the capacitor impedance (Z=E/I). The phase angle between the voltage and current allows you to calculate the ESR. If θ is the phase angle, then the ESR is given by ESR = Z*cos(θ).
Try this search:But, What kind of circuit can measure the phase angle between A and B?
I appreciate your help Sincenely.
by Duane Benson
by Jake Hertz
by Duane Benson