1. charge amount PCBA
The essence of static electricity is the existence of residual charge. Charge is all the physical quantities related to the essence of electrostatic phenomena. Potential, electric field, current and other related quantities are physical quantities generated due to the existence or movement of charges. In scientific research institutes, colleges and universities, detection stations, industrial and mining enterprises and other departments, it is often necessary to measure the amount of charge or charge density of objects. Indicates the amount of electrostatic charge. The power consumption q is expressed in Coulomb C. because the unit of coulomb is too large, it is usually used as micro library or nano library
1 Coulomb = 1000000 micro Libraries
1 micro Library = 1000 nano libraries (NC)
The amount of charged charge should be measured when measuring the charge mass ratio of powder and the performance of anti-static clothing. PCBA
In principle, Faraday Jane, electrometer and electrostatic capacitance can be used to measure the charged electric quantity of objects, but this method is cumbersome and has large error, and it is more difficult for non-static technicians to use. At present, there is a special instrument for accurate and rapid measurement of object charge - est111 digital charge meter /est112 digital electricity meter. Extremely convenient to use
2. electrostatic voltage PCBA
Since it is easy to measure electrostatic potential in many occasions, another commonly used electrostatic parameter is electrostatic potential, which is in volts. However, because the electrostatic voltage is usually very high, a larger unit - kilovolt (kV) is commonly used
1kV=1000V
The instruments for measuring electrostatic voltage are usually divided into contact type and non-contact type. Contact type is commonly used for measuring the electrostatic voltage of active charged bodies such as electrostatic generators (high-voltage power supplies). Q-V series electrostatic meters can be used for measuring this kind of static electricity. However, when the contact instrument contacts the object to be measured, it will cause the electrostatic discharge of the charged object, which will reduce the amount of charge or increase the capacitance of the charged object. These two factors will reduce the electrostatic potential of the object, so the measured results are quite different from the real charged condition of the object. Therefore, the more common method for measuring the electrostatic voltage of many objects is to use a non-contact electrostatic voltmeter, This instrument does not contact with the object to be measured at the time of measurement, so it has little impact on the static electricity of the object to be measured. The commonly used instrument is the est101 explosion-proof electrostatic voltmeter. This instrument can not only accurately and quickly measure the static electricity voltage of the object in general places, but also can be used in places with high explosion-proof requirements. Its light weight, small volume and low price make it widely used in China, such as oil depots, ammunition Initiating explosive devices, petroleum, chemical, textile, papermaking, rubber, printing, computer and other industries.
Other physical quantities include electric field strength. PCBA
3. resistance and resistivity
Measuring the resistance and resistivity of materials is an important method to determine their antistatic properties. There are requirements for measuring resistance or resistivity in many international and domestic standards.
The resistance can be measured with est121 digital ultra-high resistance micro current meter or est120 digital ultra-high resistance meter
