Weird Oscillation in wheatstone bridge circuit

  • Thread starter epcole
  • Start date
  • #1
5
0
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 [Broken]
link:
http://www.hiboox.com/go/pictures/computing/export,1e27b7fa699b1d58cdd55d0891f17ce1.jpg.html" [Broken]

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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Answers and Replies

  • #2
vk6kro
Science Advisor
4,081
40
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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