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Unformatted text preview: Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6.111 - Introductory Digital Systems Laboratory Brief Introduction to the HP Logic Analyzer There are two principal instruments used by digital engineers to test and debug digital systems. The oscilloscope is used in order to make accurate timing measurements and to investigate voltage vs. time characteristics of signals. Oscilloscopes generally have a limited number of channels. Logic analyzers have many more channels, have limited timing resolu- tion, and display only binary signals. In the 6.111 lab we have instruments which combine logic analyzers and digital oscilloscopes. The Model 1663AS has 32 logic analyzer channels, the Model 1662AS has 64 channels. Both have two scope channels. These logic analyzers can be configured as timing analyzers which give a waveform display similar to that of an oscilloscope or as state analyzers which display signals in terms of binary or hex numbers, or both at the same time. The logic analyzer is a fairly complex instrument. There are numerous documents pro- vided by HP to explain its use. At the instrument room desk you may sign out a Training Kit , containing a signal source card and a Guide with a series of tutorial lessons on how to use the instrument. At several places in the laboratory there is a three-ring notebook containing the full-fledged Reference Manual . All of this documentation, including this document, are best read in the laboratory while you are seated in front of the logic analyzer so that you can try out various operations as they are described. The logic analyzers are set up and controlled by interacting with menus. It will be much easier for you to learn the operation of the analyzer by trying out menu selection as you go along. Indeed, you can learn a considerable amount about the logic analyzer without even hooking up any signals to the logic analyzer. Turn on the logic analyzer and wait for it to complete its internal diagnostics and load the initial configuration. The logic analyzer has a disk drive that can be used to store configuration files. You will find it desirable to have your own 3.5 DSDD (1.0 MB) disk, which is available at the instrument room. Front Panel Controls The front panel consists of a display, disc drive, menu buttons, key pad, and cursor knob....
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