Modern 4g gps tracker for car varies greatly in principle and structure. How to choose 4g gps tracker for car reasonably according to specific measurement purpose, measurement object and measurement environment is the first problem to be solved when conducting a certain amount of measurement. When the 4g gps tracker for car is determined, the corresponding measurement method and measuring equipment can be determined. The success or failure of the measurement results largely depends on whether the selection of 4g gps tracker for car is reasonable.

1. Frequency response characteristics:

The frequency response characteristics of 4g gps tracker for car determine the measured frequency range, and the measurement conditions must be maintained within the allowed frequency range. In fact, the response of the sensor always has a fixed delay, and it is hoped that the delay time is as short as possible. The sensor frequency response is high, the signal frequency range can be measured is wide, and due to the influence of structural characteristics, the inertia of the mechanical system is large, because of the low frequency sensor can be measured signal frequency is low. In the dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient, random, etc.), so as to avoid the error of fire.

2. Linear range:

The linear range of 4g gps tracker for car refers to the range where the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its range, and can ensure a certain measurement accuracy. When selecting the sensor, when the sensor type is determined, the first thing to see whether its range meets the requirements.

3, according to the measurement object and measurement environment to determine the type of sensor:

To carry out a specific measurement, it is necessary to first consider the principle of 4g gps tracker for car, which needs to be determined after analyzing various factors. Because, even if the measurement of the same physical quantity, there are a variety of principles of sensors to choose from, which principle of the sensor is more appropriate, it is necessary to consider the following specific problems according to the characteristics of the measurement and the use of the sensor conditions: the size of the range; The sensor volume requirements of the measured position; Whether the measurement mode is contact or non-contact; Signal extraction method, wired or non-contact measurement; Sensor source, domestic or imported, whether the price is affordable, or their own development.

4, the choice of sensitivity:

Generally, you want the sensor to be as sensitive as possible over the linear range of 4g gps tracker for car. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing. But it should be noted that the sensitivity of the sensor is high, and the external noise unrelated to the measurement is easy to mix, will also be amplified by the amplification system, affecting the measurement accuracy. Therefore, the sensor itself should be required to have a high signal-to-noise ratio, as far as possible to reduce the introduction of factory interference signals from the outside.

5. Accuracy:

Accuracy is an important performance pointer of 4g gps tracker for car, and it is an important link related to the measurement accuracy of the whole measurement system. The higher the accuracy of the sensor, the more expensive its price, therefore, the accuracy of the sensor as long as it meets the accuracy requirements of the whole measurement system can be, do not have to choose too high. In this way, it is possible to choose a relatively cheap and simple sensor among many sensors that meet the same measurement purpose.

6. Stability:

The ability of 4g gps tracker for car use to remain unchanged in performance over a period of time is called stability. Besides the structure of the sensor itself, the main factor affecting the long-term stability of the sensor is the operating environment of the sensor. Before selecting a sensor, the environment in which it is used should be investigated, and the appropriate sensor should be selected according to the specific environment in which it is used, or appropriate measures should be taken to reduce the environmental impact. The stability of the sensor has a quantitative index, after exceeding the use period, it should be calibrated again before use to determine whether the performance of the sensor has changed.

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