07-21-2010 11:29 AM
If the spikes are not synchronous with the ripple, a frequency domain analysis might work. Take the Fourier transform of the data. The lowest frequency peak probably represents the ripple fundamental frequency (the power supply switching frequency). Select that peak and the harmonics of it. Remove everything else from the spectrum. Do an IFFT. Calculate the peak to peak value of the resulting time domain signal. This process is somewhat oversimplified to be mathematically exact, but it amy be close enough for your purposes.
Lynn
07-21-2010 12:08 PM
What about applying a low pass filter to get rid of the noise spikes?
p.s. You may have to do the analysis in LabVIEW after you transfer the waveform.
08-23-2018 06:31 AM
Have you found the simple method for ripple measurement ?
thanks and regards
anand
08-24-2018 09:26 AM
Simple ripple measurement method.
If you have noise on your signal ike the OP had in this thread then you will have to figure out how to filter that noise out if it is causing inconsistent or incorrect measurements
08-26-2018 11:16 PM
@RTSLVU wrote:
Simple ripple measurement method.
- Set oscilloscope channel to AC coupling.
- Measure the Peak to Peak voltage of the signal.
If you have noise on your signal ike the OP had in this thread then you will have to figure out how to filter that noise out if it is causing inconsistent or incorrect measurements
@RTSLVU wrote:
Simple ripple measurement method.
- Set oscilloscope channel to AC coupling.
- Measure the Peak to Peak voltage of the signal.
If you have noise on your signal ike the OP had in this thread then you will have to figure out how to filter that noise out if it is causing inconsistent or incorrect measurements
@RTSLVU wrote:
Simple ripple measurement method.
- Set oscilloscope channel to AC coupling.
- Measure the Peak to Peak voltage of the signal.
If you have noise on your signal ike the OP had in this thread then you will have to figure out how to filter that noise out if it is causing inconsistent or incorrect measurements
Earlier in this thread... other users have mentioned that Spike measurement is done via AC coupling and measuring peak to peak voltage of the signal. In that case how is it possible to measure ripple parameter through this same method ? Is their anyway we can differentiate spike and ripple measurement? or how can we measure the absolute maximum and absolute minimum of peak to peak voltage value of a signal using an oscilloscope?
Thanks and regards
anand
08-27-2018 09:20 AM - edited 08-27-2018 09:21 AM
As I said:
If you have noise (spikes) on your signal ike the OP had in this thread then you will have to figure out how to filter that noise out if it is causing inconsistent or incorrect measurements.
Remember the ripple you are trying to measure is going to be at twice the frequency of the primary AC frequency. (full wave rectification)
For instance a full wave rectified linear power supply on 60Hz will have 120Hz ripple on its DC output.
So a low pass filter with a cutoff somewhere above that should filter out your noise spikes.
07-20-2020 02:36 AM
please share spike measurement process using labview