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What is hdr-f-2.54? Is it pin arrangement or female arrangement?

High dynamic range, needle arrangement.

1 and hdr-f-2.54 are abbreviations for HighDynamicRange, which means high dynamic range in Chinese, and refers to the gray scale series between "the brightest point" and "the darkest point" in an image. The larger the dynamic range, the larger the brightness and contrast range in the image.

2.hdr-f-2.54 is an electronic circuit board. It is widely used in pin-arranging connectors of pcb circuit boards such as electronics, electrical appliances and meters. Its function is as a bridge between blocking circuits or isolating circuits. Bus arrangement is the use of specifications and does not belong to hdr-f-2.54.