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Trigger 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.