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        Display scaling

        The “User Scaling” input mask is used to configure the measured value display.

        In this dialog, two different methods are offered for general sensors to adjust the measured values ​​for specific sensor examples. There is a third method for individual strain gauges.

        1. Using the “Sensor data” input mask, the display is configured based on the technical data of the sensor from the test report or from the calibration certificate.

        The following data is required:

        • Measuring range of the sensor (Physical full scale)

        • Characteristic value (electrical full scale output)

        • Measuring range (input range) of the amplifier

        2. Using the “Calibration” input mask, the scaling factor can be determined using a known test load. To do this, it must be possible to free the sensor from the payload to be measured and then apply the test load. This procedure corresponds to a 2-point calibration in which the first point is shifted to zero by the measuring amplifier.

        The input range of the measuring amplifier is known to the configuration software in most GSV models because it is read from the EEProm of the measuring amplifier. In most cases the measurement range is 2 mV/V or 3.5 mV/V. For the GSV1A8 measuring amplifiers and possibly also the GSV-3, you must enter the input sensitivity (i.e. the electrical measuring range) under "Input Range" for all 3 methods. It is usually stated on the nameplate.

        Calculate calculates the scaling factor to be programmed.

        With OK/Set it is permanently saved in the measuring amplifier.

        Attention: only the scaling factor and the unit are permanently stored in the measuring amplifier The unit to be displayed can be set in the Configuration tab, or under Menu Bar->Channel->Unit.

        Some multi-component sensors such as K6D, F6D and K3R are not configured here, but in the "Special Sensors" dialog.

        Entering the calibration data

        “Sensor data” input mask for the calibration data of the sensor

        Enter the physical measuring range of the sensor in "Physical full scale" in the unit in which you want to measure. Enter the electrical characteristic value in “Electrical full scale output”; its unit must correspond to that shown to the right of "Input Range", for bridge sensors this is mV/V.

        Then click on "Calculate" to have the scaling calculated and then on "OK/Set" to save it in the measuring amplifier.
         

        2-point calibration

        The 2-point calibration procedure can be started in the “Calibration” tab.

        For this purpose, the zero signal and the signal at a precisely known test load, which is in the range of 10% ... 100% of the sensor's measuring range, are recorded. Test loads of 40% ... 100% are recommended.

        The measuring amplifier should be warmed up before starting the procedure, i.e. it should be switched on for some time (up to 30 minutes, depending on the model).First you enter the value of the test load in “Calibration Load” in the unit to be measured. Then free the sensor from load, click “Execute Calibration” and follow the instructions in the wizard. At the end click "OK/Set" to save the determined scaling factor in the measuring amplifier.

        Scaling for strain gauges

        The display for strain measurement with strain gauges (DMS) can be configured via the “Strain gage” tab. This could also be a preparation for the stress analysis, but the elastic modulus of the material would still have to be taken into account. The stress analysis with rosette strain gauges should be better configured under "Special Sensor"->"Calculate principal stress".

        Here in "Strain gage" the scaling for displaying strain is determined in µm/m. The scaling factor is calculated from the k factor (gage factor), the bridge type and the Poisson's ratio, if bridge types with longitudinal and transverse grids are used. Use "Bridge type" to select one of the following bridge types:

        Full (4): Full bridge with 4 strain gauges, without cross grids
        Half (2): Half bridge with 2 strain gauges, without cross bars
        Quarter (1): Quarter bridge with a strain gauge
        Half (1+µ): Half bridge with transverse grids, one longitudinal and one transverse
        Full (2+2µ): Full bridge with cross grids, 2 longitudinal and 2 transverse

        Enter the K factor of the strain gauge used in “Gage factor” and, if necessary, the Poisson’s ratio under “Poissons ratio µ”. Then click on "Calculate" to have the scaling calculated and then on "OK/Set" to save it in the measuring amplifier. Only with the GSV-2 device model can you also save the individual DMS parameters in the device using “Store to device”.

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