8–3
Theory of Operation
Theory of operation is included only as supplemental information.
Block-Level Theory
The Agilent Technologies 54853A/54A/55A Oscilloscopes have four channels which are
individually sampled up to 20 GSa/s. Each channel stores up to 256 Kbytes of memory.
The bandwidths are:
54853A 2.5 GHz
54854A 4 GHz
54855A 6 GHz
The front panel provides:
• Dedicated knobs and pushbuttons for major oscilloscope functions.
• An 8.4-inch (diagonal) color flat panel display for waveform, measurement, and graphical
interface display.
• A 3 1/2-inch flexible disk drive.
• BNC connectors for channel input signals, auxiliary trigger input, and auxiliary output.
• AutoProbe interface for probe power and probe control.
• A connection for probe compensation.
The rear panel provides several connections:
• The line power input.
• An GPIB connector, for connection to an instrument controller.
• An RS-232 connection.
• A parallel printer connection.
• VGA monitor connection.
• Mouse and keyboard connections.