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How to use a Network Analyzer With Current Probes?
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graybeard:

--- Quote from: SniperFox on February 17, 2020, 06:50:20 pm ---I just realized that the CT1 and CT2 probes have a really tiny hole.
The AC mains wires won't fit into it. Datasheet says that the hole size is ~1.4mm, and the AC mains wires are 2mm. Not to mention I'm going to have to put 2 of them through the hole sometimes to make measurements, so it needs to be at least 4mm...

If I solder a thinner piece of wire onto the DUT in series to be able to fit the CT2 probe on, that would mess with the results, right?
I'm assuming so, because of the slightly higher resistance in the thinner wire causing slightly less current...

Would this be a reasonable compensation for the small hole or would it mess up my results too much?

--- End quote ---

It should work so long as you incorporate it into your cal.
SniperFox:

--- Quote from: graybeard on February 15, 2020, 12:11:18 am ---I made a video on how to do it with the bode plot function with a Siglent o-scope

https://youtu.be/T6mbTblw4QE



--- End quote ---

Didn't say which Monday I would watch, haha.
I finally watched your video today and it was great. Thanks for making it!
Wolfgang:

--- Quote from: SniperFox on February 14, 2020, 07:36:54 pm ---Hi everyone,

I'm wondering how to set up current probes to use it with a network analyzer. I don't know how to calibrate them properly for short, open, and 50ohm terminations (oh and through, too. SOLT). It's straight forward with BNC or SMA connections but what about current probes?

What I tried:
Short -> I made a small wire loop.
Open -> left it open.
Load -> I made a small wire loop with a 50ohm resistor.
Through -> I Put a small wire loop between both probes.

This didn't seem to work, as the trace has lots of spikes and is bouncing up and down all over the place... so I'm seeing nothing but noise when I try to take measurements.
I'm trying to measure S11 and S21 btw.


What I'm trying to do is use a network analyzer with current probes to measure the impedance of a LISN and SMPS power supply. This is  step towards systematically designing a conducted EMI filter.
I found this neat scholarly article explaining how to measure those impedances under operating conditions with clamp-on current probes. See link below.
https://www.researchgate.net/publication/260589392_EMI_filter_design_Part_II_Measurement_of_noise_source_impedances

If you scroll down a bit, you can view the article without downloading it.

They explain everything very well and derive the equations well too. The problem is that they don't explain how to calibrate and use the VNA with the current probes.
They also don't say what probes or VNA they used. Although I am 90% sure that they used CT1 or CT2 probes because a few of their references use those probes.

If anyone wants details on the instruments I'm using: I'm using E5061B VNA and two P6021 current probes.

(I tried searching the forums for this topic but could not find anything)

--- End quote ---

Seen this ?

https://electronicprojectsforfun.wordpress.com/power-supply-impedance-measurements-for-various-power-supplies/power-supply-impedance-measurements-using-the-bode100-lf-vna/powwer-supply-impedance-measurements-using-a-current-injector-and-a-current-probe/

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