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Recent content by mortalwombat

  1. mortalwombat

    Estimate torque quality in test stand

    I don't need the hardware. I need information how to interpret my signals. Example: My teststand runs a gear unit with 1000 rpm and 10kNm. My signal amplifier (with build in Lowpassfilter 5Hz) shows a constant torque signal with +/- 0.5% variation. Ok - Then I remove my lowpassfilter and I get...
  2. mortalwombat

    Estimate torque quality in test stand

    Hello, I need information about estimating my torque quality for optimizing a gear endurance test stand. Example: I want to compare my measured torque with an "ideal" or "allowed torque variability" for 10kNm and 1000 rpm. Does anybody know something about an ISO / VDI / DIN / EN / IEEE or...
  3. mortalwombat

    Reducing excitation voltage for bridge measurements

    According to NI the 2V-limit is given by the ADC. This will be the lowest value for all cases. What I'm thinking about is putting two extra resistors in the circuit of the half bridge. One after excitation (+) and before strain gauge 1 and one after strain gauge 2 and excitation (-). The...
  4. mortalwombat

    Reducing excitation voltage for bridge measurements

    I'm using the NI 9237. According to NI it is not possible to go under 2V excitation voltage... For this I want to reduce the voltage between 9237 and strain gauge...
  5. mortalwombat

    Reducing excitation voltage for bridge measurements

    Hello, I'm using a National Instruments Compact DAQ System for measuring strain gauges. The system allows an excitation voltage of 2V (minimum) for my half-bridge. Unfortunately the strain gauges I have to use aren't able to stand this voltage and allow only 1V (maximum) excitation voltage. Is...

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