Including Options 002, 003, 007, 010, 011, 013, 580, 602, 611, 631, H03, and H51) This manual applies directly to instruments with serial numbers prefixed 1351A (18OC), 1340A 180D and 1341A 180D H51). With changes described in Section VII, this manual also applies to instruments with serial numbers prefixed from 1125A through 1315A and 1434A. For additional information about serial numbers, see MANUAL IDENTIFICATION AND CHANGES in Section I. This manual provides operating and service information for the Hewlett-Packard Models 180C and 180D Oscilloscope The manual is divided into eight sections, each covering a specific topic or aspect of the instrument. All schematics are located at the rear of the manual and can be unfolded and used for reference while reading any part of the manual.