磁控管的判别(国外英文资料).docVIP

磁控管的判别(国外英文资料)The discrimination method of microwave oven magnetron: 1. After discharging, the high-voltage capacitor is discharged and the magnetron is pulled out. 2, with Multimeter X1 European resistance files, measuring two filament feet, resistance should be 1 ou. 3, use the x10k file as a measure of silk feet on the ground is infinite. 4, unplug the magnetron filament at either end, electricity, let it boot in the normal state for about 2 seconds, immediately shut down (unplugged), and quickly measure the voltage of high voltage capacitor (1000V test), 500V (due the varying lengths of time, voltage values are not the same) is fast voltage drop and. If so, replace the magnetron. 5, if 2 items are not normal, then the magnetron is changed directly. If 3 items are abnormal, check: high voltage fuses, capacitors, transformers, etc.. Microwave oven magnetron detection method: magnetron is the key component of microwave oven, mainly by the tube core and magnet two parts, as shown in figure 1. The tube core is composed of a cathode, a filament, an anode, an antenna (a waveguide, etc.). The operating principle of the utility model is that when the power supply is switched on, the 3.3V alternating current generated at the two ends of the secondary filament coil of the high-voltage transformer supplies power to the magnetron filament. At the same time, the high voltage winding produces about 2000V AC voltage by high voltage current limiting capacitance, diode rectifier after DC high voltage to the magnetron anode is about 2000V, the formation of the accelerating field (anode grounding, cathode is actually negative 2000V, see Figure 2), the cathode (direct heat and heat of type two, Fig. 2 for direct thermal emission of electrons to the anode) accelerated motion. Have a strong magnetic field perpendicular to the direction of the formation of a permanent magnet in the process of accelerating electrons to the anode, the electron is rotate to the anode acceleration (like th