Hello. My name is Paul Farto. I'm from Agilent Technologies. I'm an applications support
engineer. And today, we're going to be talking about an application using ultra-capacitors
and making measurements on these devices -- ESR measurements and also capacitance measurements,
utilizing the 14585 software with the N6705B.
Now we can go to the slides and actually talk about the actual characteristics of the product.
So what is ESR? ESR is an equivalent series resistance. But you know traditionally, in
order to make ESR measurements, you have to utilize a network analyzers, which is fairly
expensive equipment, or an impedance analyzer, or even a custom transient solution.
Capacitance is defined from this specific vendor, which we are using as a reference,
from Maxwell. They refer capacitance measurement based on this specific equation. The ESR measurement
is also supplied by them.
And this measurement is very critical to understand, because you can see that the traditional model
of a capacitor consists of a resistance and, obviously, the capacitance. So these two components
are very important for ultra-capacitance analysis.
So now I'm going to be loading the software workspace by going to File, Workspace, and
loading my saved profile that I had done prior. Now the markers are placed in such a way that
it is selected based on the equation. So once you have that marker information, you'll
be able to calculate to the actual capacitance based on the formula.
But, today, we have a much easier way to make this calculation automatically. It is using
the custom formula editor. And I'm going to be showing you by selecting my formula. And
what I did is I inputted the formula that calculates capacitance.
So now, once I select this, it is going to display the actual capacitance from Function
1, which is what I have selected. So the capacitance is 11.2 farads. Now I'm going to the device,
so you can see that this device is actually a 10-farad capacitor, with a
tolerance of 20 percent.
So, therefore, going back to the measurement data, we can see that the capacitance is well
within tolerance. So now the next measurement that we're going to be doing is actually
ESR measurement. So I'm going to, again, load my profile.
And, again, the markers are placed in specific locations, as per the formula. And, again,
you can manually calculate based on marker data. That would be a manual process. And
we are now offering a custom formula, which I will be showing you, that you could enter
the actual custom formula, and be able to calculate the ESR of this device.
As you can see, the ESR of this measurement is 72 milliohms. This device has a specification
of 75 milliohms DC ESR. So you can see that's pretty close to the specification.
In conclusion, we could easily make these measurements using the 14585 software with
the N6705, be able to calculate capacitance and calculate ESR. Capacitance measurement
today -- typically, LCR meters are used to make these measurements. Since the capacitances
are such high values -- for instance, this device is 10 farads -- LCR meters are not
able to make these measurements. Also, ESR, on an LCR meter, is basically an AC measurement.
We are making a DC ECR measurement which could model the actual characteristics of the device.
So using the software and the N6705, we can easily make these measurements. Thank you