How to perform electrostatic testing in a clean room workshop? -common problem

How to perform electrostatic testing in a clean room workshop?

The purpose of the electrostatic test is to determine the benchmark of electrostatic charge potential, surface resistance characteristics, and the effectiveness of the ionizer charge neutralization system; the test consists of 4 parts: electrostatic charge potential measurement, surface resistance test, ionizer discharge time test, Ionizer residual voltage measurement;...

Text label: clean clean room modular electrostatic testing, clean clean room modular testing and testing

How to conduct electrostatic testing in clean clean room modular workshop?

The purpose of the electrostatic test is to determine the benchmark of electrostatic charge potential, surface resistance characteristics, and the effectiveness of the ionizer charge neutralization system; the test consists of 4 parts: electrostatic charge potential measurement, surface resistance test, ionizer discharge time test, Ionizer residual voltage measurement; electrostatic charge potential measurement to determine the electrostatic charge potential generated on objects in the test area, which is achieved by measuring the surface voltage or electric field generated by the charge, and surface resistance testing to determine whether the object can be effectively dissipated when grounded Static charge, it also determines whether it is grounded, and by measuring surface resistance and surface-to-ground resistance, electrostatic dissipation characteristics can be assessed. Ionizer discharge time tests are related to the ionizer residual voltage measurement and are related to the performance of the ionizer, which is used to neutralize the surface charge of an ungrounded or insulator, these tests are performed to measure the discharge time of an initially charged isolated metal plate, As well as determining the residual voltage of the initially uncharged isolated metal plate, the results of each measurement indicate the efficiency of neutralizing electrostatic charges and the resulting imbalance between positive and negative ions.

Surface resistance measurement, place two electrodes on the surface with the correct spacing, measure the surface resistance with an ohmmeter with a suitable output voltage, the ohmmeter must be able to measure at 10V and 100V, record each specified measurement point The measured value of ; ground one electrode and the other electrode should be placed on the surface as recommended by the manufacturer, measure the surface resistance with an ohmmeter with a suitable voltage output, and record the measured value at each specified measuring point. Ionizer test: The performance of the ionizer is evaluated by measuring the discharge time and residual voltage. The imbalance of positive and negative ions in the ionized air flow is measured by the residual voltage measurement. The efficiency of the ionizer to eliminate static charge is measured by It is determined by the discharge time; the instrument for measuring the performance of the ionizer specified in the industry standard is a charged plate detector, which basically consists of an isolated conductive plate of known capacitance, which is charged to a known voltage or to zero Power supply, a means of measuring the voltage on the board and the time it takes to reach a preset level; place the CPM at the specified measurement point, and use the power supply to charge the isolated conductive plate to a known positive voltage; as the static charge on the board is When the ionizer is reduced, measure the time when the static voltage on the plate will reach 10% of the initial voltage, record the measurement value at each specified measurement point; charge the plate to a known negative voltage, record the measurement at each specified measurement point value. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification workshops.

Clean room surface charge potential measurement: choose the test instrument according to whether the object to be measured is an insulator or a conductor and its physical size, the hand-held instrument probe, the distance from the grounded metal plate according to the manufacturer's regulations, the electrometer or field strength Set the reading of the meter to zero; hold the probe so that it is parallel to the metal plate, the surface area of u200bu200bthe metal plate should be large enough for the required probe opening, and the metal plate is large enough to have a suitable probe to surface spacing ratio; make the probe close to the surface of the object, and use an electrometer to measure the surface voltage of the conductor, or use an electrostatic field strength meter to measure the electric field of an insulator or conductor, and record the measured value of each specified measuring point. Residual voltage measurement: Place the CPM at the specified measurement point, ground the isolated conductive plate to remove residual charge, if necessary to zero the CPM reading, disconnect the ground connection; allow sufficient time for the isolated metal plate to drain from the ionizer Once the charge is obtained and the reading is stable, record the residual voltage. Some ionizers will jump from positive to negative during normal operation. In this case, record the maximum positive and maximum negative readings of the residual voltage.

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