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Trigger couplingTrigger coupling can be chosen depending on the signal type used for oscilloscope synchronization. The description of every coupling types is as follows: DC (direct current) – input type is open. Both constant and variable input signal components can be passed through. AC (alternating current) – Input type is closed. Only variable input signal component can be passed through. HF Reject (high-frequency filter) – signal high-frequency attenuation, attenuation of signals with high frequency, e.g. 140 KHz LF Reject (low-frequency filter) – signal low-frequency attenuation, attenuation of signals with low frequency, e.g. 7 KHz Edge triggering allows using of all coupling types acceptable. As a rule any other triggering types allow using DC input. The switching on of HF reject or LF reject allows watching low-frequency or high-frequency component of the signals under research. The picture below shows a signal oscillogram with constant component at rising edge triggering.
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