The 2246 1Y and 2246 Mod A are 100 MHz, four-channel, dual-sweep, portable oscilloscopes for general-purpose use. A microprocessor-based operating system controls most of the functions in each instrument, including a fully integrated menu-driven voltage and time measurement system with SmartCursors®. A menu-driven service mode provides for configuring of certain menu and readout displays, internal calibration, and servicing diagnostics. The instruments include additional EMI shielding. (See Table 1-2, Environmental Characteristics, for more information.) The vertical deflection system has four input channels. Two channels have 11 basic deflection factors from 2 mV to 5 V per division, and two channels have two basic deflection factors of 0.1 V and 0.5 V per division. Basic deflection factors can be extended with attenuator probes. VOLTS/DIV readouts are switched to display the correct vertical scale factors when properly coded probes are connected to the vertical input connectors. The horizontal deflection system provides single, dual, or delayed sweeps from 0.5 s to 20 ns per division (delayed sweep, 5 ms to 20 ns per division). The trigger system provides stable triggering over the full bandwidth of the vertical deflection system. Alphanumeric crt readouts of the vertical and horizontal scale factors are displayed at the bottom of the screen. On-screen vertical and horizontal cursors provide accurate voltage, time, frequency, and phase measurements; measurement values are displayed at the top of the crt. The measurement features include voltage measurements for+Peak, -Peak, Peak-to-Peak, and average DC, or positionable cursors for measuring voltage difference, time difference, frequency, and phase. SmartCursors® that visually track voltage measurements, trigger levels, and ground can be placed on displayed waveforms. Delay-time and delta-delay measurements for time, frequency, and phase are available in ALT and B Horizontal Modes. STANDARD ACCESSORIES The following items are standard accessories shipped with the 2246 1Y and 2246 Mod A instrument: 2 Probes, 10X, 2 meter, with accessories 1 Probe, 1X, 2 meter, with accessories 1 Power cord 1 Power cord clamp 1 CRT implosion shield, blue plastic (installed) 1 Fuse, 2A, 250 V, slow-blow 1 Attaching accessory pouch 1 Accessory pouch, ziploc 1 Front cover The following items are standard accessories shipped with the 2246 1Y instrument: 2 Operators manuals 2 Service manuals 2 Reference guides The following items are standard accessories shipped with the 2246 Mod A instrument: 1 Operators manual 1 Reference guide