Products > Test Equipment
LCR Impedance Viewer for Picoscope+Keysight+R&S Bode Plot Data (open source)
<< < (29/30) > >>
_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.

Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod