Products > Test Equipment

Broken probe, how do I argue this with warranty.

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nsled:
I made a video of the problem here

And this was the response:

"I have sent your video & questions to the engineer.

Below the answer

HVP series is not able to test the switching power. It’s the passive probe, only can measure power that is insulated/grounded. (your transformer is not grounded) You need a Differential Probe for your application. You can buy our DP-50K
https://www.pintek.com.tw/productDetail/land-ctop-2/index/pscsn/17072/psn/241470

Thank you.".

Am I being gaslighted here? why would this 1000x passive probe read any different from the 10x passive probe. I don't know how to argue and demonstrate the point.

jonpaul:
Response seems correct.

See 1980s Tektronix Circuit Concepts books,

"Oscilloscope Probe Circuits"

https://w140.com/tekwiki/images/6/62/062-1146-00.pdf

"probe Measurements"

https://w140.com/tekwiki/images/1/19/062-1120-00.pdf


j

PS: poor test setup, hazardous HV at high freq.

check HV forums for precautions

nsled:

I kind of get where the argument is coming from, however I still believe its faulty. Why would 2 passive probes give completely different results? Show me a good test setup. As shown its a battery -> buck converter -> 240v inverter -> 6kV transformer.

Narrowing it down to just the 240Vrms (338Vpeak) since it's a known voltage, the 10x passive probe on the scope measures it perfectly fine with the exact same connection whereas the 1000x probe does not.

tautech:
Swap probe to another channel, reassign 1000x attenuation.
Set channel to 1V/div.
Sanity check with probe compensation output. 3V p-p 1kHz ?

nsled:

--- Quote from: tautech on July 05, 2024, 11:05:40 am ---Swap probe to another channel, reassign 1000x attenuation.
Set channel to 1V/div.
Sanity check with probe compensation output. 3V p-p 1kHz ?

--- End quote ---

The other channels are the same. The 1000x probe does not register anything at the 3V output, the 10x checks fine.

I just remembered that I put it on a plasma globe when I first got it (and took a photo), which measured 5kV. Now its measuring 10kV so it's definitely developed a fault somehow.

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