We have developed the DL1640 and DL1640L digital oscilloscopes, successors to the popular DL1500 series of general-purpose oscilloscopes which were released in 1995. The new oscilloscopes have increased performance capabilities, and are more compact and lightweight, thanks to the analog block employing specially developed ICs, a digital block of larger packaging density, and a power supply block with increased efficiency. The specially developed ICs are namely an ADC IC united with a preamplifier and a highly integrated data acquisition IC. Equipped with a Web server function, DL1640 and DL1640L offer greater operability. Hereafter this paper shall collectively refer to them as DL1600 since there is no difference between their performance except the maximum record length—8 MW for the DL1640 and 32 MW for the DL1640L.