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Reduce noise on the output signal

Measures to improve the signal/noise ratio

Connect the ground of the power supply and the ground of the analog-digital converter to the terminal of the measuring amplifier

  • "run all wires as a pair to and from the measuring amplifier";
  • GND at the measuring amplifiers GSV-1 and GSV-11 is then doubly connected!

The quality of the power supply is decisive for the quality of the output signal.

  • The measuring equipment should have its own power supply,

  • A switching power supply can cause interference. If in doubt, it is better to use a linear power supply.

  • own cable duct for sensors and actuators
  • Terminating resistor 10kOhm or 1kOhm at the analog input of the PLC or the AD converter. The electronics of ME-Meßsysteme have 50Ohm output resistance and can therefore be loaded. The error due to load on the output is usually negligible (50 Ohm/ 10000 Ohm)
  • Some AD converters require oversampling and subsequent averaging. The scatter of AD converters using the SAR method Successive Approximation can be quite high...
  • Twisted pair cables
  • Place the screen on one side only
  • Connect Earth to Test bench 
  • Using the Ground Connection of the GSV-8DS
  • For GSV-8DS, try connecting the GNDE terminal (ground for analog input) to ground.
  • Exclude USB port as source: e.g. Ground USB, remove notebook power supply, use grounded power supply.
  • Check the insulation resistance of the sensor
  • Avoid ground loops, ground unilaterally,
  • Only route cables with ground reference to the measuring amplifier in pairs: Supply voltage + GND FROM power supply TO measuring amplifier is a pair, output signal + GND FROM measuring amplifier TO power supply is a pair

For more information, refer to this document: kb shield_en.pdf

Over the entire measuring range of force sensors or torque sensors, analog amplifiers usually achieve a signal-to-noise ratio between 1000/1 and 10000/1 (with a bandwidth of 250Hz).