Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
03/12/12 18:58
Read: times


 		 #186615 - CT accuracy
Responding to: ???'s previous message
Accuracy i want but not in decimal point....

"there is limit to the accuracy of a C.T. for chopped waveforms due to freq components"
ya you are right. there is high freq. component at CT output.
how can we eliminate that? I am using LPF.........

i give CT output to differential amplifier through Burden resister but i observed High freq gate pusle on output. after i increased the frequency of gate pusle (pulse Transformer isolation) than high freq. component almost remove but overshoot at SCR trigger point ..
i do not know what is the reason??

you mention bandwidth and offset are limitations:
but its in my case freq. is 50hZ and for offset, select minimum offset OPAM.

is there any other limitation? i know precision rectifier is not suitable for chopped wave but i do not have any proof and solid reasons(proved on paper)....


List of 66 messages in thread
TopicAuthorDate
Sine wave detection on microcontroller            01/01/70 00:00      
   Detect or measure?            01/01/70 00:00      
      not detection, measurement of sine wave signal            01/01/70 00:00      
         What are you measuring?            01/01/70 00:00      
            RMS and Average - 1st Priority            01/01/70 00:00      
               415 v            01/01/70 00:00      
                  I have to do using MCU            01/01/70 00:00      
                     Start simple            01/01/70 00:00      
                        if time is major isssue than.....            01/01/70 00:00      
                           People responding to specific questions            01/01/70 00:00      
                              Same Technique....            01/01/70 00:00      
                                 RMS            01/01/70 00:00      
                                    Sorry for my laziness            01/01/70 00:00      
                                 So what have you done?            01/01/70 00:00      
                                    Require more work...            01/01/70 00:00      
                                    Working on that            01/01/70 00:00      
                                       options, options            01/01/70 00:00      
   Help me            01/01/70 00:00      
      Okay            01/01/70 00:00      
         Are many threads available            01/01/70 00:00      
      when you save a char ...            01/01/70 00:00      
      Why don't you specify your problem COMPLETELY?            01/01/70 00:00      
         Already specify it            01/01/70 00:00      
            there are some details?            01/01/70 00:00      
               comparisions            01/01/70 00:00      
                  How are you calculating your needed sample rate?            01/01/70 00:00      
                     start with simple one....            01/01/70 00:00      
                        You do know sin(90+angle)? Or 2-log computations?            01/01/70 00:00      
                           ADC resolution............            01/01/70 00:00      
                              impossible or wrong            01/01/70 00:00      
                              double post, ignore            01/01/70 00:00      
                  Precision Rectify:            01/01/70 00:00      
                     SCR Chopped Wave            01/01/70 00:00      
                        What accuracy do you need?            01/01/70 00:00      
                           CT accuracy            01/01/70 00:00      
                              the fundamental            01/01/70 00:00      
                              50Hz            01/01/70 00:00      
                              Precision rectifier is suitable for any waveform            01/01/70 00:00      
                                 are u sure??            01/01/70 00:00      
                                    Depends            01/01/70 00:00      
                                    must be severely bandwidth limited            01/01/70 00:00      
                                       Maybe was circuit with top-voltage capacitor            01/01/70 00:00      
                                       Sorry for confusion            01/01/70 00:00      
                                          What accuracy do you need?            01/01/70 00:00      
                                             360/1024            01/01/70 00:00      
                                                Not what he (or me) have asked            01/01/70 00:00      
                                                   you are right....            01/01/70 00:00      
                                                Do you believe you can protect your circuit from noise?            01/01/70 00:00      
                                                   Very Noisy environment            01/01/70 00:00      
                                                      re Very Noisy environment            01/01/70 00:00      
                                                         Some of those rules are showing their age            01/01/70 00:00      
                                                            here we go again            01/01/70 00:00      
                                                               think about this for a minute            01/01/70 00:00      
                                                                  when discussing a FAQ            01/01/70 00:00      
                                                                     Well, when were those cap sizes determined?            01/01/70 00:00      
                                                                        Technology            01/01/70 00:00      
                                                                           Steady state currents do not need decaps            01/01/70 00:00      
                                                                              Often low capacitance so limited charge. But remember load.            01/01/70 00:00      
                                                                        fixations            01/01/70 00:00      
                                                                           Nothing. has been proven yet.            01/01/70 00:00      
                                                                              once more for the peanut gallery            01/01/70 00:00      
                                                                                 Where you sit determines what you see ...            01/01/70 00:00      
                                                                                    Off-topic            01/01/70 00:00      
                                                                                       difficult when ...            01/01/70 00:00      
                                                                                       Yes ... I don't know how we got here either            01/01/70 00:00      
                                                                                          i do            01/01/70 00:00      

Back to Subject List