TAILIEUCHUNG - Oscilloscopes Episode 7

Tham khảo tài liệu 'oscilloscopes episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | signal trigger take-off ext. trigger o trigger fast ramp to tl holdoff strode comparator staircase generator t timing ramp reset at t5 ratemeter comparator 8 adder 6 ratemeter ramp 6 ratemeter memory gated at to dot pos diff comp Start 2 Stop to 9 - start to stop Figure Provided the input waveform has a constant period like Figure and not like Figure then the random sampling mode can display the whole of the leading edge by using a predicted trigger time Sampling oscilloscopes 109 the repetition rate of the signal how far this ramp can run down before the next trigger occurs. When it occurs the level of the ramp will be gated into the ratemeter memory waveform 7 . The . level in the memory is therefore a measure of the repetition rate of the signal hence the name ratemeter . A small amount of . is added to waveform 7 and the result which is shown as waveform 8 is fed to the ratemeter comparator. This compares the ramp itself with this . level and will produce as is clear from the waveform illustration a tj pulse ahead of the next t0 pulse. The time difference between the two is called lead time and expresses how much time we have gained how much sooner the fast ramp can be started than in the sequential system of Figure . If the lead time is adjusted to a suitable value by varying the amount of . added to waveform 7 we can arrange it so that the leading edge of interest is displayed in any desired position such as the centre of the screen. Should the signal repetition rate change and t0 suddenly appear earlier or later the t preceding it will be too late or too early respectively but the new t0 time will gate a new ramp level into the ratemeter memory which with the addition of the usual . level will produce the correct tj in relation to the new signal repetition rate on the very next cycle assuming there are no further changes in signal repetition rate. It seems a workable solution. But in fact there are problems not the least of .

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