> > The way to do this properly, as in how a real DMM does it, is to use a > dual-slope converter that will produce a useful number with every sample. > > These successive approximation converters that are common as dirt these > days are just not very good at the job of converting a signal and > producing a useful number. > > -- > David Forbes, Tucson AZ
DMMs with true RMS measurements have been discussed here before, but the only proper way to measure true RMS is by following it's definition. My DMM is also true RMS, but really, any DC voltage shows as 0V RMS which is by definition incorrect. Leaving out the DC component means including a high pass filter, but they are not ideal, so for any frequency below the specified frequencies, you cannot rely on the RMS reading. Following this integral and squaring method should produce a reliable reading from 0Hz up to a certain frequency. Michel -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
