What is the maximum voltage and current of X-ray machine? Different types of X-ray machines have different maximum voltage and current values. Taking a 5KW100mA portable X-ray machine as an example, the maximum power is 5.3KW, the maximum tube current of the small filament is 20mA, and the maximum tube current of the large filament is 100mA.
The mA meter and the X-ray tube are connected in series in the high-voltage circuit. The value indicated by the mA meter is both the current value passing through the X-ray tube. Therefore, the larger the mA number, the more electrons hitting the anode target surface per second. The more X-rays are produced. The total amount of X-rays generated after several seconds can be indirectly expressed by the product of milliamps and time, which is usually called exposure. One milliamp of exposure per second is called one milliamp-second, and is recorded as 1mAS. In the full-wave rectification X-ray machine, due to the distributed capacitance to the ground of the high-voltage cable and the secondary wire of the high-voltage transformer, these distributed capacitances can be equivalent to an equivalent capacitance connected in parallel with the X-ray tube. Therefore, the value indicated by the milliamp meter It is not all the current in the tube that produces the X-ray, and several milliamps of current flow through the distributed capacitance. This part of the current is called capacitive current. Due to the small amount of capacitive current, it has no significant effect on the photo work, but because the value of the current in the tube is similar to that of the fluoroscopy, it is easy to give people false impressions, so there are generally corresponding measures inside the machine to compensate. The small X-ray machines are all self-rectifying, and the mA measurement system does not add a rectifier. Therefore, the mA meter does not display the current value of the AC capacitor.
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