During the actual use of the testing machine, it is impossible to use the test alone without the sensor of the testing machine. At present, there are many types of testing machine sensors on the market, and the products vary greatly. So, what aspects should we pay attention to when we choose the sensor of testing machine? What performance does it need to have?
1. The accuracy of the load cell sensor:
Accuracy is an important performance index of the testing machine sensor, which is directly related to the accuracy of the test results. Generally, the higher the accuracy of the testing machine sensor, the more expensive it is. Therefore, when the customer chooses the sensor of the testing machine, it must be based on the actual situation, and the accuracy of the sensor can meet the accuracy requirements of the measurement system.
2. Frequency characteristics of the load cell sensor:
The frequency characteristic of the testing machine sensor directly determines the frequency range of the material to be measured. It is necessary to maintain no distortion within an allowable frequency range to meet the requirements. In fact, there will be a certain delay in the response of the sensor of the testing machine. In short, the shorter the delay time, the better.
3. The linear range of the load cell sensor:
Linear range refers to the range in which the output is proportional to the input. Theoretically, the linear range of the testing machine sensor is relatively stable. The wider the linear range of the testing machine sensor, the larger its measuring range and can guarantee its measurement accuracy. However, it is impossible for any testing machine sensor to guarantee its absolute linearity. When the required measurement accuracy is relatively low, the testing machine sensor with a small nonlinear error can be approximately regarded as linear, which brings convenience to the measurement.
4. The stability of the load cell sensor:
If a tensile testing machine sensor can still guarantee its constant performance after being used for a period of time, then its stability is very good. In general, there are two main factors affecting the long-term stability of the testing machine sensor: one is its own structure; the other is the working environment of the testing machine sensor. Therefore, the testing machine sensor should have strong environmental adaptability.
5. The flexibility of the load cell sensor:
In the linear range of the tensile testing machine sensor, everyone hopes that the higher the flexibility of the tensile testing machine sensor, the better. Because the higher the flexibility, the greater the value of the output signal corresponding to the measured change, which is beneficial to signal processing. At the same time, we have to pay attention that the higher the flexibility of the tensile testing machine sensor, the greater the impact of external noise. Therefore, when selecting the sensor of the tensile testing machine, the compatibility of flexibility, volume and anti-interference issues should be ensured.
