Noise Feedback, how to measure?
Noise Feedback, how to measure?
(OP)
Is there a standard procedure for measuring noise feedback of a sensor?
First off, I am assuming that noise feedback would be the noise from the sensor that gets injected back into the power supply.
If I had to guess you would want to place something inbetween the power supply and the sensor (R/L network for isolation ??) then attach an oscilloscope between the R/L network and the sensor.
What values of R/L (if I guessed correctly ..for R/L network) would I pick?
Suggetions?
Thanks for your time
Qu1nn
First off, I am assuming that noise feedback would be the noise from the sensor that gets injected back into the power supply.
If I had to guess you would want to place something inbetween the power supply and the sensor (R/L network for isolation ??) then attach an oscilloscope between the R/L network and the sensor.
What values of R/L (if I guessed correctly ..for R/L network) would I pick?
Suggetions?
Thanks for your time
Qu1nn





RE: Noise Feedback, how to measure?
1)what kind of sensor? and
2)what kind of power supply?
3)general application?
RE: Noise Feedback, how to measure?
RE: Noise Feedback, how to measure?
TTFN
RE: Noise Feedback, how to measure?
Typically the unit is ran at a known voltage. For example 30Vdc, and lets also say that it is regulated (+/- 10mV noise)
My question is; how can you isolate the power supply from the powered unit so that I can measure noise generated back into the power source.
Thanks
Qu1nn
RE: Noise Feedback, how to measure?
RE: Noise Feedback, how to measure?
Pay attention to what Melone is saying.
RE: Noise Feedback, how to measure?
Qu1nn
RE: Noise Feedback, how to measure?
If the latter, you can only realistically do this by measuring the noise of the power supply and sensor with the sensor turned on and turned off. The extra noise, if any, would be attributable to the sensor. Any other approach short of building an exact impedance surrogate for the power supply in question will give erroneous results. The reason is that any noise injected back to the power supply must manifest itself across the output series impedance of the power supply itself.
TTFN