Author Topic: Noise at the oscilloscope use voltage generator QW-MS3010D  (Read 598 times)

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Offline gtr

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Noise at the oscilloscope use voltage generator QW-MS3010D
« on: March 27, 2019, 01:24:04 pm »
Hello everyone,

Lately I bought this voltage generator https://www.amazon.com/QW-MS3010D-Adjustable-Stabilizer-Supply-Standard/dp/B07GCLK1R2 thinking to use it to replace 1.5V and 9V batteries on fixtures .

Unfortunately here is what gives to the oscilloscope with the generator on 9V in the first image and in the second with a 9V battery.

Does anyone have the same problem with this QW-MS3010D?

What can I do to remedy this noise?

Thank you! :-)
 

Offline jiarui

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Re: Noise at the oscilloscope use voltage generator QW-MS3010D
« Reply #1 on: March 27, 2019, 02:02:09 pm »
I'm pretty sure it's a switching power supply. I have a similar unit. It's very cheap, but supplies 10A. It has pretty high ripple and switching noise.  Use the scope to measure the power supply directly. You'll see the noise from the power supply.  You should use a linear supply.  Something like this one:

https://www.amazon.com/Tekpower-TP3005P-Programmable-Variable-Regulated/dp/B06XCQN82X/ref=sr_1_4?crid=OKVALYGDUIMV&keywords=linear+power+supply&qid=1553695249&s=electronics&sprefix=linear+power%2Celectronics%2C130&sr=1-4
 

Offline LateLesley

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Re: Noise at the oscilloscope use voltage generator QW-MS3010D
« Reply #2 on: March 27, 2019, 02:27:49 pm »
do you have any inductors and capacitors laying around? You could construct a Pi filter on the powerline, and reduce the noise that way.
https://electronics.stackexchange.com/questions/302052/best-way-to-filter-dc-dc-output-noise

https://electronicscoach.com/pi-filter.html
 

Offline gtr

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Re: Noise at the oscilloscope use voltage generator QW-MS3010D
« Reply #3 on: March 29, 2019, 01:27:58 pm »
Hello,

Thank you both for your response. The problem is only with the oscilloscope because the generator works well apart from that. If I connect my probe to another place in the mount, the signal to the oscilloscope is much better and virtually no noise.

I'm going to do so for now while waiting to buy another linear voltage generator.

Thank you! :-)
 
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