Weird Oscillation in wheatstone bridge circuit

AI Thread Summary
The discussion centers on a Wheatstone bridge circuit experiencing oscillation after initial startup, with a frequency of approximately 100 kHz. The circuit utilizes a PST 4130 power supply from Omega Engineering, which is suspected to introduce noise despite being marketed as low noise. The user reports that the oscillation disrupts signal clarity and affects calculations. Suggestions include contacting the supplier for potential warranty support or troubleshooting advice. The issue highlights the importance of power supply quality in sensitive measurement applications.
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I have this weird oscillation coming from my circuit. its a wheatstone bridge with a single strain gage. I am using The PST 4130 from Omega Engineering to supply +10vdc. When I first turn it on the signal is pretty clean, but after a while, it turns into this:

[PLAIN]http://www.hiboox.com/go/pictures/computing/export,1e27b7fa699b1d58cdd55d0891f17ce1.jpg.html
link:
http://www.hiboox.com/go/pictures/computing/export,1e27b7fa699b1d58cdd55d0891f17ce1.jpg.html"

I'm using 120ohm resistors. The noise shows up at about every .002sec and oscillate at about 100khz.
Does anyone have an idea what this is and how to get rid of it? It is really throwing off my calculations.
 

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Sounds like noise from a switched mode power supply.

For a $180 10 watt power supply which is claimed to be low noise, this one isn't very good.

If it is still under warranty, you could call the suppliers and get it fixed. In any case, call them and see what happens.
 

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