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Carbon dioxide laser tube voltmeter production

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Measurement of volt-ampere characteristics of CO2 laser tube and fabrication of 50KV voltmeter Abstract Starting from the problems of laser engraving machine, the measurement method of volt-ampere characteristics of CO2 laser tube is expounded, and the fabrication of a self-made 50KV DC voltmeter is detailed. Abstract: A measurement method of CO2 laser tube's volt-ampere characteristic is showed in this paper after some problem were found in laser engraving machine, and a self-made 50KV DC voltmeter is introduced. Key words CO2 laser tube volt-ampere characteristics measurement 50KV high voltage DC voltmeter laser engraving machine Key Words: CO2 laser tube; volt-ampere characteristic; measurement; 50KV high volt DC voltmeter; laser engraving machine I. Introduction It is well known that in addition to CO2 laser tubes, CO2 laser engraving machines also have laser power supplies. , drive motors, drives, motion control cards, focusing mirrors, mirrors, rails, racks, etc. If all the links meet the technical requirements and the assembly process is accurate, it will not be difficult to debug. If some parts are not up to standard, then the debugging process will be troublesome. At this time, it is often necessary to repeatedly find the crux, laser tube, laser power supply, drive motor, driver, motion control card, focusing mirror, mirror, guide rail, Racks and other links need to be inspected, and the results of inspections are often returned without success. It is really a waste of labor. An engraving machine using a 1600mm laser tube has a maximum output current of 28mA. A newly assembled engraving machine of the same specification can only output 6mA, no matter how it is adjusted, it is 6mA. When the laser tubes on the two engraving machines are interchanged, the output currents of the two engraving machines are also interchanged with the interchange of the laser tubes: the original output of 28 mA can only output 6 mA; the original output of 6 mA can The output is 28mA. This shows that there is no problem with the components other than the laser tube, and the problem arises on the laser tube - the performance of the laser tube does not match the laser power source. Although the two laser tubes are 1600mm in the same way, due to some reasons in the production process, the volt-ampere characteristics of the CO2 laser tube are highly discrete, even exceeding the upper and lower limits of the technical requirements, which brings the debugging work of the engraving machine. A lot of trouble. So how do you measure the volt-ampere characteristics of a laser tube? 2. The measurement test of the volt-ampere characteristic is carried out directly on the laser engraving machine, because the cooling system, the connection circuit and the milliampere meter on the machine are all ready-made, and it is convenient and safe to connect without having to connect separately - as long as the high-voltage DC voltage is applied The two probes on the table are clamped on the positive and negative terminals of the laser tube to measure the voltage across the laser tube. The laser tube current is set on the motion control card, and 3 to 32 mA rises from small to large. Each time a current is given, the voltage across the laser tube is measured, and the volt-ampere characteristic is quickly drawn. As shown by curve I in Figure 1. Since the maximum output current of the other laser tube on the original engraving machine is only 6 mA, after the exchange test, it may be that the trigger voltage of the laser tube is higher than the original laser tube, and the output voltage of the laser power supply on the original engraving machine is not up to The trigger voltage value of the laser tube is caused. By replacing the laser power supply with a 1800mm laser tube, the current can rise to 28mA. The measured volt-ampere characteristics are shown in curve II of Figure 




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