Why is the electronic universal tensile testing machine negative 0.00 at the beginning?

The negative value at the beginning of the electronic universal tensile testing machine may be caused by the incorrect calibration of the equipment or the failure of the sensor. To ensure accurate test results, you can follow the steps below: 1. Confirm whether the device has been calibrated correctly.If the device is not calibrated, the measured value may be inaccurate. You can calibrate the device according to the operation manual, or contact the device manufacturer for calibration guidance. 2. Check whether the sensor is working normally. If the sensor fails, the measured value may not be accurate. You can check whether the sensor is connected well and try to do some simple tests to confirm whether the sensor is working properly. 3. Make sure that the test sample has been properly installed and clamped. If the test sample is not installed or clamped correctly, the measured value may not be accurate. Before testing, please make sure that the sample is installed correctly and use the appropriate fixture to fix it on the device. 4. Confirm whether the correct test procedures and parameters are used during the test. If incorrect test programs or parameters are used, the measured value may be inaccurate.Before starting the test, please make sure to use the appropriate test procedures and parameters, and make sure that they match the sample and test requirements. If you still can't solve the problem after following the steps above, please contact the device manufacturer or professional technician for further help and support.