Abstract: An assembly for dissipating heat generated by electronic components which include a ventilating panel having a plurality of vent holes arranged thereon. More specifically, the perforation pattern of vent holes is staggered to provide adjacent larger and smaller vent holes in at least two rows of vent holes. A second row of vent holes is staggered with respect to the first row of vent holes such that the larger vent holes are aligned with smaller vent holes, preferably in a ratio of two smaller vent holes per one larger vent hole. Such a perforation arrangement of vent holes may be provided on a blindswap cassette for securing and aligning computer cards for mounting in a housing, such as a sled for use in computer systems.

Abstract: A lapping plate topography system includes a measuring apparatus for measuring the surface of a lapping plate, and an analysis apparatus for analyzing and presenting the data resulting from such measurements. The measurement apparatus has a non-contacting capacitive probe for measuring a height of the surface of the lapping plate, a rotary arm assembly for moving the probe in an arc over the surface of the lapping plate, and a spindle assembly for rotating the lapping plate about its center. The computer-based analysis apparatus is operable to input from the measurement apparatus the measured height at a plurality of data points on the surface of the lapping plate, calculate Fourier transform harmonic coefficients based on the plurality of measured heights, calculate surface ripple coefficients based on the calculated Fourier transform harmonic coefficients, and output the calculated surface ripple coefficients to an appropriate display device.

Abstract: A lapping plate topography system includes a measuring apparatus for measuring the surface of a lapping plate, and an analysis apparatus for analyzing and presenting the data resulting from such measurements. The measurement apparatus has a non-contacting capacitive probe for measuring a height of the surface of the lapping plate, a rotary arm assembly for moving the probe in an arc over the surface of the lapping plate, and a spindle assembly for rotating the lapping plate about its center. The computer-based analysis apparatus is operable to input from the measurement apparatus the measured height at a plurality of data points on the surface of the lapping plate, calculate Fourier transform harmonic coefficients based on the plurality of measured heights, calculate surface ripple coefficients based on the calculated Fourier transform harmonic coefficients, and output the calculated surface ripple coefficients to an appropriate display device.

Abstract: A retainer clip is shown for retaining a device through an opening in a panel such as a printed circuit board, enclosure wall or similar structure. The clip surrounds the portion of the device projecting through the aperture and by a single longitudinal motion engages cooperating portions of the device to secure the device at the panel opening. The clip includes means for detenting in the assembled, locking position to prevent accidental release of the device from the secured, mounted condition.

Abstract: A retainer clip is shown for retaining a device through an opening in a panel such as a printed circuit board, enclosure wall or similar structure. The clip surrounds the portion of the device projecting through the aperture and by a single longitudinal motion engages cooperating portions of the device to secure the device at the panel opening. The clip includes means for detenting in the assembled, locking position to prevent accidental release of the device from the secured, mounted condition.