I have purchased an Analog Discovery 2 with the Impedance Analyzer add-on board to see if it would be a suitable replacement for the HP4294A that my employer currently has as it's starting to perform poorly. Luckily, the personnel that are using this only use it to measure the impedance and phase of piezo devices and don't really use any of the other features that it offers.
I am pretty sure that the AD2/IA setup will work for them but upon initial setup, I am finding some issues. The first thing that I have noticed is that I get quite a lot of Resitor Too Low messages. This doesn't make sense to me as the software states that it automatically switches to the approriate reference resistor. If that is the case, then in my mind I should never see those messages when using the Impedance Analyzer add-on board.
I am testing this system out by verifying that the plots/data that I get when using the HP4294A match the results when I use the AD2/IA setup. As of right now, I see spikes occuring when during anti-resonance, which also coincides with the Resistor Too Low messages. I can clear those spikes by selecting a higher resistor in the drop-down menu. If I set that same resistance value, at the beginning of the plot, the software automatically lowers it as the impedance at resonance is ~10Ω. I have searched the forums and have found a suggestion about creating a custom program that would prevent the changing of resistances during the Constant Voltage mode that I am going to try.
I had also seen a post in which it was suggested to try lowering the Vrms value. In playing around with the software, I lowered the voltage from 1Vrms to 100mVrms which did get rid of those Resistor Too Low messages. As I was watching the Resistor selection menu through the entire cycle, I would see it increase the resistor value as it continued on with the cycle whereas previously once it switched to the lower 10Ω resistor it would never increase it. The only problem with the lower voltage is that the waveform now displays a step in the phase plot that goes above 90 degrees and it should never go above that. With that being said, I am confused on how one would set the appropriate voltage for the DUT. I am assuming that the HP4294A is set to 1Vrms. Any thoughts or suggestions will be greatly appreciated. I will be creating a custom program but that also required to set the appropriate Vrms which I am currently confused on how to properly set that.
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MLopes
I have purchased an Analog Discovery 2 with the Impedance Analyzer add-on board to see if it would be a suitable replacement for the HP4294A that my employer currently has as it's starting to perform poorly. Luckily, the personnel that are using this only use it to measure the impedance and phase of piezo devices and don't really use any of the other features that it offers.
I am pretty sure that the AD2/IA setup will work for them but upon initial setup, I am finding some issues. The first thing that I have noticed is that I get quite a lot of Resitor Too Low messages. This doesn't make sense to me as the software states that it automatically switches to the approriate reference resistor. If that is the case, then in my mind I should never see those messages when using the Impedance Analyzer add-on board.
I am testing this system out by verifying that the plots/data that I get when using the HP4294A match the results when I use the AD2/IA setup. As of right now, I see spikes occuring when during anti-resonance, which also coincides with the Resistor Too Low messages. I can clear those spikes by selecting a higher resistor in the drop-down menu. If I set that same resistance value, at the beginning of the plot, the software automatically lowers it as the impedance at resonance is ~10Ω. I have searched the forums and have found a suggestion about creating a custom program that would prevent the changing of resistances during the Constant Voltage mode that I am going to try.
I had also seen a post in which it was suggested to try lowering the Vrms value. In playing around with the software, I lowered the voltage from 1Vrms to 100mVrms which did get rid of those Resistor Too Low messages. As I was watching the Resistor selection menu through the entire cycle, I would see it increase the resistor value as it continued on with the cycle whereas previously once it switched to the lower 10Ω resistor it would never increase it. The only problem with the lower voltage is that the waveform now displays a step in the phase plot that goes above 90 degrees and it should never go above that. With that being said, I am confused on how one would set the appropriate voltage for the DUT. I am assuming that the HP4294A is set to 1Vrms. Any thoughts or suggestions will be greatly appreciated. I will be creating a custom program but that also required to set the appropriate Vrms which I am currently confused on how to properly set that.
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