Abstract: There is provided a spectrum analyzer and a spectrum analysis method capable of promptly performing measurement while preventing the spectrum waveform caused by the fractional spurious components from being displayed. When the width of a designated span (analysis target frequency range) is larger than a boundary value, a reference signal frequency is set to a predetermined reference value, and a loop filter band narrower than a RBW (resolution bandwidth) is selected to thereby make the fractional spurious components be within the RBW and prevent it from being displayed as a spectrum waveform.

Abstract: A design cover attachment structure is provided configured to facilitate an attachment/removal of a design cover composed of a plurality of decorative plates. At least a top surface and each of side surfaces of a casing of an electronic apparatus are covered with a design cover composed of a top surface decorative plate, and left and right side surface decorative plates. The left and right side surface decorative plates are provided with second engagement portions configured to be engaged with first engagement portions provided to a bottom surface decorative plate mounted on the casing or a bottom surface of the casing, so that the left and right side surface decorative plates are mounted on the casing. Third engagement portions configured to be engaged with fourth engagement portions provided to the top surface decorative plate, so that the top surface decorative plate is mounted on the left and right side surface decorative plates.

Abstract: There is provided a spectrum analyzer and a spectrum analysis method capable of promptly performing measurement while preventing the spectrum waveform caused by the fractional spurious components from being displayed. When the width of a designated span (analysis target frequency range) is larger than a boundary value, a reference signal frequency is set to a predetermined reference value, and a loop filter band narrower than a RBW (resolution bandwidth) is selected to thereby make the fractional spurious components be within the RBW and prevent it from being displayed as a spectrum waveform.

Abstract: A display apparatus, comprises a filter unit 33 attached on an air inlet opening 28a, having such a filter 36 that a suction negative load generating at the air inlet opening 28a formed in an upper cabinet 3 comes to be smaller than the suction load generating at gaps 29a and 30a defined in the upper cabinet 3, when driving a cooling unit 18, for sucking an air from the upper cabinet 3 and discharging the air used for cooling into the upper cabinet 3, when cooling down optical parts, such as, display devices 15R, etc., and a polarizing plate 16R, etc., of an optic unit 9.

Abstract: A design cover attachment structure is provided capable of facilitating attachment/removal of a design cover composed of a plurality of decorative plates. At least a top surface and both side surfaces of a generally box-like casing of an electronic apparatus are covered with a design cover composed of a top surface decorative plate, a left side surface decorative plate, and a right side surface decorative plate. The left side surface decorative plate and the right side surface decorative plate are provided with second engagement portions configured to be engaged with first engagement portions provided to a bottom surface decorative plate mounted on the casing or a bottom surface of the casing and third engagement portions configured to be engaged with fourth engagement portions provided to the top surface decorative plate.

Abstract: A display apparatus, comprises a filter unit 33 attached on an air inlet opening 28a, having such a filter 36 that a suction negative load generating at the air inlet opening 28a formed in an upper cabinet 3 comes to be smaller than the suction load generating at gaps 29a and 30a defined in the upper cabinet 3, when driving a cooling unit 18, for sucking an air from the upper cabinet 3 and discharging the air used for cooling into the upper cabinet 3, when cooling down optical parts, such as, display devices 15R, etc., and a polarizing plate 16R, etc., of an optic unit 9.

Abstract: A frequency conversion unit converts the frequencies of input signals into intermediate frequencies using a predetermined local oscillation frequency. A sweeping unit sweeps the local oscillation frequencies in a predetermined sweeping time. A filter selectively passes signals having frequency components of a predetermined bandwidth based on signals sent from the frequency conversion unit. An A/D converter samples signals that have passed the filter and converts them into predetermined digital data. A signal processing unit processes signals, extending the digital data saved in the data storage unit into frequency spectrum data. A correction data storage unit saves the correction data of the delay times for the bandwidth in the filter.

Abstract: A method for the mixing of a polyol with a low-boiling foaming agent for the manufacture of a rigid foamed polyurethane. The polyol is blended in advance with a specific amount of the low-boiling foaming agent such as chlorodifluoromethane (designated by HCFC-22) or the like in a liquid state. In this case, it is possible to uniformly supply the polyol and the specific amount of HCFC-22 to a polyurethane foaming system, resulting in a homogeneous foaming reaction whereby a rigid foamed polyurethane having excellent cell uniformity without any voids may be obtained.

Abstract: A method of manufacturing a powder molding having a undercut portion, etc. comprises filling a space of a die with a powder, pressing the powder in the space of the die by punches inserted therein through an opening of the die, and withdrawing a undercut portion shaping means from the space of the die for extracting the powder molding.

Abstract: According to the present invention, there is provided a rigid foamed polyurethane and a process for the manufacture of the polyurethane wherein the polyurethane is made up substantially of closed cells which contain at least a foaming agent designated by HCFC-22 and CO.sub.2 gas therein. The foamed polyurethane can be obtained by using HCFC-22 or a blend of the HCFC-22 with HCFC-142b as foaming agent which has a short life in the atmosphere because of having hydrogen atoms in their molecules. Thus, according to the present invention, it is possible to avoid the use of conventional foaming agents which are suspected of being substances eating a hole in the atmospher's layer of ozone and consequently linking to global warming.The rigid foamed polyurethanes of the present invention, which contain a foaming agent designated by HCFC-22 having a boiling point of -40.8.degree. C. in their closed cells, can retain their good thermal insulating properties over a temperature of from about -30.degree. to -40.degree. C.

Abstract: A refrigeration showcase comprising a display case, a machine case and an air duct connecting the display case to the machine case, the display case comprising a display table for displaying commodities as placed thereon, a cover member openably covering the display table from above to define a commodity chamber above the display table and permitting the commodity chamber to be seen therethrough from outside, and an air passage member disposed under the display table and providing a cold air supply portion for supplying cold air therethrough to the commodity chamber and a cold air discharge portion independent of the supply portion for discharging cold air from the commodity chamber therethrough, the machine case comprising a case body, a refrigerator housed in the case body and providing a refrigeration cycle and a cold air circulating blower for supplying air cooled by the evaporator in circulation, the air duct having a forward air channel for transporting the cold air, and a return air channel independent