|
Eurocard is a European standard format for PCB cards that can be plugged together into a standardized subrack. The subrack consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf. At the "back" of each card is one or more connectors, which plug into mating connectors on a backplane that closes the rear of the subrack. == Dimensions == As the cards are assumed to be installed in a vertical orientation, the usual meanings of height and width are transposed: A card might be 233.35 mm "high", but only 20 mm "wide". Height is measured in rack units, "U", with 1 U being . This dimension refers to the subrack in which the card is to be mounted, rather than the card itself. Enclosure heights are multiples of 3U, with the cards always shorter than the enclosure. Two common heights are 3U (a 100 mm card in a subrack) and 6U (a 233.35 mm card in a high subrack). As two 3U cards are shorter than a 6U card (by 33.35 mm), it is possible to install two 3U cards in one slot of a 6U subrack, with a mid-height structure for proper support. Card widths are specified in horizontal pitch units "HP", with 1 HP being . Card depths start at and increase in increments. The most common today is , but standard hardware is available for depths of , , , , , and . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eurocard (printed circuit board)」の詳細全文を読む スポンサード リンク
|