Generally, portable or portable instruments are the best and most used instruments in the field. When comparing whether the power supply is a battery or AC, it is generally most convenient to use a battery. However, it is best to use AC power in the laboratory to avoid the trouble caused by frequent battery changes. Note that there is no battery undervoltage indication for battery-powered instruments. Because the battery's accuracy is significantly reduced when the battery is under voltage. For AC-powered instruments, pay attention to whether the power supply voltage meets the requirements of the local power supply. Before use, check that the power supply voltage selection switch is in the proper position.
In general, there are three main parameters for measuring static electricity: electrostatic voltage, charge quantity and resistance. The physical quantity of the electrostatic nature is the charge quantity, and in many scientific researches, the charge density or the charge quantity must be measured. There are many inconveniences in different occasions, so it is impossible to directly measure the charge amount in many sites, and only the surface electrostatic voltage can be measured at this time. Many materials can be used to identify the antistatic performance by detecting the surface resistance or volume resistance. The basic measuring instruments that any department should be equipped with are electrostatic voltmeters and high resistance meters. Periodically inspect some objects that may generate static electricity during operation. When conditions permit, it should also be equipped with static detection alarm and human body comprehensive resistance tester. If the instrument is used in a flammable and explosive place, it must be explosion-proof, and pay attention to its explosion-proof level. It also depends on whether the instrument has the explosion-proof mark and the explosion-proof certificate number.
The instruments sold by Jiangsu Dongxiang Instrument Co., Ltd. are: flow meters, temperature meters, pressure meters, transmitters, meters, etc.