[Automatic Resistance with Impedance Analyzer]

Thank you @attila

How the MaxAmplitud  change  when you set the voltage on the DUT on 'CV Resistor' mode? (For example voltage=3V or Voltage=10mV)

thanks again

 

 

 

[Automatic Resistance with Impedance Analyzer]

Hi @attila

Please, give me more information about the mathematic criteria that govern change the resistor up or down.

Thank you

 

[Automatic Resistance with Impedance Analyzer]

Hi @MLopes and @attila.
 

Thanks for sharing all your comments. 
As mentioned Attila, we have similar doubt about how the IA (by Waveform) can adjust automatically the reference resistor.
 

We solved the resistors alarm using the "custom" mode and the "contanst voltage adapter" script example. But the signal was more noisy. 

The Vtotal(wavegen)=V(DUT)+V(reference resistor)
V(DUT)= VRMS*√2
V(Total)= "amplitude"

The VRMS/Amplitude measure the relative weight of Zdut/[Z(DUT)+Z(ref resistor)]

I don't know which is the best criteria to change the resistor. The "constant voltage adapter" example use the 25 rate to switch the resistor.
For example. If you set in the "contanst voltage adapter" script:
Voltage= 0.01 
Max amplitud=0.25 

The amplitude can move between 0,25V-0.02V until switch the resistor down or up.

Please, correct me if I wrong

Attila , can you explain me how it work "CV mode"

 

best regards

Matías

[EIS Experimentation with AD2-IA]

Hi @attila

Thanks for your reply and sorry for the delay.
So we have two ways to analyze the bode behavior of our DUT.

First way: the automatic constant voltage mode
1- When we use this configuration, the "resistance too low" or "resistance too high" alarm turn on. We don't know why that happened. AD2-IA was unable to select internal resistance? Can we trust the results under the red alarm signal?

2- There is an ecuation to know HOW the AD2-IA change numerically "the Wavegen Amplitude and ... also the Resistor value".

3-Please, Can you explain the next equation (what are these parameters?)
 

https://forum.digilentinc.com/topic/19370-ad2-accuracy-of-impedance-analyzer/#comment-52514

         

second way: custom mode

4- Please, Can you give us some script code example to select the reference resistor by our criteria?

Thank You very much!

Matías

 

[Frequency Limitation on Impedance tool]

Please, Can you help me to do the -Zimg vs ZReal nysquit plot as we need. 

Happy new year!

Matías

[Frequency Limitation on Impedance tool]

Hi Attila, 

I know about the custom plot option. But neither the nysquit or custom plot are reals nyquist plot. Please see that the imaginary "y" axe have negative values (thats incorrect) and in the custom plot you share have frequency units in the "x" axe. It should be the real Z (in Ohm units).

thanks you again

[Frequency Limitation on Impedance tool]

Hi,

First, thank you for all the shared information.

As Cleber said, Also I need to plot a Nyquist as traditional form "-ImaginaryZ" vs "RealZ". For example: the next figure, is a simulated nyquist for a R= 2,7 kOhm  and C= 1 uF (in parallel). As you can see, the graph have positive value for both, "Y" and "X", axes.

 

I'm using the "waveform-Impedance Analyzer" with the adapter (AD2 + IA). 

I try using the recommended script, but didn't work. Please, Can you explain me how to do it? 

plot1.X.data = Impedance1.Traces.Trace.getData("Rs")
plot1.Y1.data = Impedance1.Traces.Trace.getData("Xs")

Thanks