How to press the DR exposure button of the hand switch

A customer asked how to press the DR exposure button of the hand switch. The DR exposure button of the hand switch is an X-ray machine exposure switch. The hand switch is generally equipped with two switches. Press the hand switch button to the first gear to turn on the first gear, and press it all down to turn on the second gear. At this time, the first gear remains on. The first gear is to preheat the tube and increase the speed. The second gear is for X-ray machine exposure.
The service life of the hand switch is also very long. The service life of the electrical components can reach 300,000 times, and the service life of the mechanical parts is 1,000,000 times. Therefore, the service life of the hand switch is very long.