Instruments used in the field

Generally, the instruments used in the field are preferably pocket-sized or portable. Whether the power source is battery or AC, the battery is the most convenient. Apparatus It is best to supply AC power if it is mainly used in the laboratory to avoid the trouble of frequent battery replacement. For battery-powered instruments, pay attention to whether there is a battery undervoltage indicator. Because the accuracy of the instrument will be significantly worse when the battery is undervoltage. Generally, the instrument used in the field is preferably a pocket-sized or portable. Whether the power source is battery or AC, the battery is the most convenient. Apparatus It is best to supply AC power if it is mainly used in the laboratory to avoid the trouble of frequent battery replacement. For battery-powered instruments, pay attention to whether there is a battery undervoltage indicator. Because the accuracy of the instrument will be significantly worse 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. Some have 115/230V selector switches (such as EST801 electrostatic generator). Check whether the power supply voltage selector switch is in the proper position before use. Usually there are three main basic parameters for measuring static electricity, static voltage (bit), charge (density) and resistance (rate). The amount of charge is a physical quantity that is the essence of static electricity. In many scientific researches, the amount of charge or charge density is measured. However, it is inconvenient to directly measure the amount of charge at many sites. At this time, measure the electrostatic voltage on the surface. The antistatic properties of many materials can be identified by testing their surface resistance or volume resistance. The basic measuring instruments that should be equipped in any department are electrostatic voltmeters and high-resistance meters. Periodic inspections are carried out on objects that may generate static electricity. If conditions permit, it should also be equipped with an electrostatic detection alarm door (device) and a human body resistance tester. The instrument used in flammable and explosive places must be explosion-proof, and pay attention to its explosion-proof grade. It depends on whether there is an explosion-proof mark and an explosion-proof certificate number on the instrument.