The vacuum tester is a high-voltage electrical appliance commonly used in power systems. Its core component is a vacuum interrupter. Because the arc extinguisher is based on vacuum conditions, it is not as easy as an oil switch and SF6 switch to detect its quality. . Traditionally, vacuum circuit breaker users determine the vacuum degree of the arc-extinguishing chamber by means of power frequency pressure resistance method. This method can only roughly judge the arc-extinguishing chamber with severe vacuum degree.
1, the instrument is a precision instrument, circuit board wiring density, generally require storage in a relatively dry place. If the environment is humid, you should always power on.
2. If the current value of the vacuum tester after testing is zero, check the arc extinguishing chamber surface is clean. Because the surface is not clean, the change value of the leakage current may be greater than the ionization current value. In this way, the measured value minus the leakage is less than zero, and the instrument is judged as zero. After this happens, the surface of the arc extinguish chamber is cleaned and tested again. In general, the degree of vacuum obtained in this manner is more accurate.
3, when used, the high voltage output line must not touch the human body to prevent electric shock.
4. When the high-voltage indicator lights up, do not touch the high-voltage line and magnetron current line to prevent electric shock.
5, disassembly and printing paper in the vacuum tester instrument power first, in order to avoid damage to the printer. When changing paper, open the front panel, and use the index finger and thumb to pinch the two clips on both sides of the printer and gently pull the printer out so that the exit port is slightly higher than the instrument panel, but you cannot drag out the distance too much and the new paper port section Cut into a pointed shape, insert the printer's feed port, open the instrument power switch, press the print button, make the paper from the printer's top out of a distance, insert the panel outlet slot to export. Cover the printer panel and load it.
6, vacuum tester without any user-serviceable parts, such as failure, please professional maintenance, or contact the supplier, do not open the instrument without permission, in order to avoid accidents or cause unnecessary losses.
7. The measuring range of the vacuum degree of the instrument is between 9.999×10-1 and 1×10-5, and the ion current measurement range is between 9.999×10-1 and 1×10-7. When the vacuum degree of the vacuum tube is greater than 10- The vacuum tube is recommended to be scrapped when the 2 Pa or ion current is greater than 500uA.
8. If the pressure in the vacuum tube of the vacuum tester is equal to atmospheric pressure (ie, the vacuum tube is broken), the instrument will reject the test and return to the initial state within the measurement range of the instrument.
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