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???
03/06/11 16:28
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 		 #181450 - Hardly....
Responding to: ???'s previous message
..because the AD637 doesn't compute the RMS directly but by a methode which needs low pass filtering. So, when the signal frequency is very low, then this methode doesn't work properly, because it results in huge settling times and ripple.

Kai Klaas

List of 28 messages in thread
TopicAuthorDate
Adding a DC biac to a bipolar signal?            01/01/70 00:00      
   summing            01/01/70 00:00      
      Resitor bias            01/01/70 00:00      
         Yes, mentioned but maybe missed            01/01/70 00:00      
   What about the character of the signal?            01/01/70 00:00      
      Information content..            01/01/70 00:00      
         Hardly....            01/01/70 00:00      
            So the only option would be software RMS?            01/01/70 00:00      
               100Hz or 100 beats per minute?            01/01/70 00:00      
                  100Hz.            01/01/70 00:00      
                     50-150Hz is in the range of AD637!            01/01/70 00:00      
                        That's great! (but some other concerns...)            01/01/70 00:00      
                           Can you show us a typical signal?            01/01/70 00:00      
                              A Typical EMG Signal            01/01/70 00:00      
                                 Probably tough for rms chi            01/01/70 00:00      
                                    I'm working with a dsPIC            01/01/70 00:00      
                                       Shouldn't be too expensive            01/01/70 00:00      
                                 Give the AD637 a try...            01/01/70 00:00      
                                    Look at LTC1966            01/01/70 00:00      
                                       Interesting...            01/01/70 00:00      
                                          Just received a fresh new batch of AD637s            01/01/70 00:00      
               Negative supply voltage available?            01/01/70 00:00      
   Does your system have a driven electrode?            01/01/70 00:00      
   better be careful            01/01/70 00:00      
      Regrowth            01/01/70 00:00      
         are you suggesting that humans are expendable?            01/01/70 00:00      
            All precautions taken.            01/01/70 00:00      
            Obviously            01/01/70 00:00      

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