Digital network test circuit includes microprocessor analyzing both logical state and detailed analogue voltage levels for analysis of errors

摘要

The tester comprises a line interface circuit (1) which determines, on its output (4), the logical state. An analogue-digital converter (5) digitizes the electrical voltage values on the data lines and stores them. A microprocessor (11) then analyses the time series of stored data. The tester comprises a line interface circuit (1) which determines, on its output (4), the logical state corresponding to the signals presented on the data lines (H,L) of a network to be tested. An analogue-digital converter (5) digitizes at high speed the electrical voltage values presented on the data lines and sends them for storage in a memory (10) at the same time as the logical states presented on the output (1). A microprocessor (11) then analyses the time series of stored data. The tester is thus able to carry out a combined analysis on the logical state and the physical state of the network, to monitor accurately the rise times of the electrical voltage level, the fall times and the dominant electrical levels.