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| LCR Impedance Viewer for Picoscope+Keysight+R&S Bode Plot Data (open source) |
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| _Wim_:
Looking at your pictures, I see that is was just your drawing stating the incorrect connection. But I also see in your picture you are using a scope probe to connect the signal generator to the reference resistor. This is not ok, as scope probes use resistive coax which can have quite a bit of resistance. Use a BNC cable with crocodile clips or something similar instead. |
| _Wim_:
--- Quote from: _Wim_ on April 23, 2024, 06:31:00 pm ---Looking at your pictures, I see that is was just your drawing stating the incorrect connection. But I also see in your picture you are using a scope probe to connect the signal generator to the reference resistor. This is not ok, as scope probes use resistive coax which can have quite a bit of resistance. Use a BNC cable with crocodile clips or something similar instead. --- End quote --- I would even recommend not to use scope probes for channel A & B also, but this should have less negative impact and the connection with the signal generator. However, I never used scope probes myself, I just used short BNC cables or a test jig... |
| mawyatt:
Here's something that one might find useful using a SDS2000X DSO for Impedance Measurements. https://www.eevblog.com/forum/testgear/capacitive-impedance-plots-with-sds2104x-plus-bode-function/msg4335745/#msg4335745 https://www.eevblog.com/forum/testgear/admittance-measurements-with-dso-awg-with-bode-function/msg4491952/#msg4491952 Best, |
| Cykeltur:
ok so i have skipped the probe för the generator side, THANKS :-+, then from the generator, I have tryed 2 options (like in the manual and in your revommendation): option 1: Gennerator to B probe "red" and then also from Gennerator thru the ref resistor (120 ohm). on the other side of the Rref I have the A probe"blue" and also from the other side of the Rref i have connected the DUKin. then thru the DUK to DUKout, to GND clip on proBe A and B. same result :-/ then i have altso tryed the ; option 2: Gennerator to A probe "blue" and then also from Gennerator thru the ref resistor (120 ohm). on the other side of the Rref I have the B probe"red" and also from the other side of the Rref i have connected the DUTin. then thru the DUT to DUTout, to GND clip on probe A and B. odd result :-/ the DUT has red and black cables in the picture, same as before, |
| _Wim_:
--- Quote from: Cykeltur on April 24, 2024, 09:52:23 am ---ok so i have skipped the probe för the generator side, THANKS :-+, then from the generator, I have tryed 2 options (like in the manual and in your revommendation): option 1: Gennerator to B probe "red" and then also from Gennerator thru the ref resistor (120 ohm). on the other side of the Rref I have the A probe"blue" and also from the other side of the Rref i have connected the DUKin. then thru the DUK to DUKout, to GND clip on proBe A and B. same result :-/ then i have altso tryed the ; option 2: Gennerator to A probe "blue" and then also from Gennerator thru the ref resistor (120 ohm). on the other side of the Rref I have the B probe"red" and also from the other side of the Rref i have connected the DUTin. then thru the DUT to DUTout, to GND clip on probe A and B. odd result :-/ the DUT has red and black cables in the picture, same as before, --- End quote --- If the software is still configured as in the attached screenshot, then you should use option 2. I am however not sure what is exactly wrong, but a few suggestions to figure is out: - 1) while everything is connected like in option 2, just use your picoscope software and generate a 1kHz sine signal of 1V. Take a screenshot of the signals you see on channel A and channel B. Repeat while generating a 20kHz sine signal. This should give us an idea what the scope actually sees and hopefully make the issue more clear. - 2) instead of connecting an RLC as the DUT, please only use a known resistor or known capacitor and measure the impedance. This will also make it easier to understand the results. |
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