Weird Oscillation in wheatstone bridge circuit

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SUMMARY

The discussion centers on a Wheatstone bridge circuit experiencing oscillation issues, specifically when using the PST 4130 power supply from Omega Engineering. Initially, the signal appears clean, but after a short period, it becomes noisy, oscillating at approximately 100 kHz with a noise interval of 0.002 seconds. The user suspects that the noise originates from the switched-mode power supply, which is not performing as expected despite being marketed as low noise. Recommendations include contacting the supplier for potential warranty service.

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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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