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Terry Lingle
12/01/05 09:09
Read: 587 times

#104509 - ur uhm
Responding to: Srinivasa Rao Samineni's previous message
Not sure who ur is.
But if a different load cell amplifier works correctly it follows that the issue must be resolved within your design, layout or software.
You do need to identify the source of the signal that is interfering as the proper solution is based on the root cause.
Your mains supply is 50 Hz? If so induced signal could be the cause. Shielding and grounding would be where I would look next if that is the case.
A different possible source is static from the belt grounding through your sensor input and modulating the input. These are strictly guesses as you have not provided enough information to define which section of your device is the probable culprit.

What does your oscilloscope show? Does connecting it to the input signal point affect the readings? If not what doe you see? The superimposed signal should be your source.

If there is no visible signal try loading or if it can be safely done shorting the inputs. If the signal is still there it is entering your electronics through a path other than the intended signal path. Possibly the power supply connection is allowing it in.
Perhaps even probably it is a radiated signal from the motor its drive or wiring that is being picked up by the board. Here shielding will help but other more drastic fixes may be needed including layout changes on the board or even design changes to improve immunity. It is impossible to choose where to look without more information. Terry

List of 13 messages in thread
about weigh feeder      Srinivasa Rao Samineni      11/26/05 01:45      
   Lack of details      Terry Lingle      11/26/05 06:34      
      "Cleverer"      Steve M. Taylor      11/27/05 07:39      
         Yes that would improve response time      Terry Lingle      11/27/05 08:24      
            so would I      Steve M. Taylor      11/27/05 10:24      
   weigh feeder details      Srinivasa Rao Samineni      12/01/05 04:57      
      Could it be induced noise?      Valentin Angelovski      12/01/05 05:39      
      ur uhm      Terry Lingle      12/01/05 09:09      
         the easy test      Erik Malund      12/01/05 09:30      
            Good point Erik      Terry Lingle      12/01/05 09:53      
      Do I miss something?      Kai Klaas      12/01/05 11:05      
         I agree      Srinivasa Rao Samineni      12/01/05 22:49      
            Dampening      Kai Klaas      12/02/05 05:38      

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