Select range of data based on selected

cnschulz 

You have to write a measure to filter another visual.  

Derive another table. Don't make any relationship with this table.

ActivityTable = SUMMARIZECOLUMNS('Table'[ACTIVITY_ID])

Use this table in the slicer

Create a measure for filtering the measure.

FilterMeasure =
VAR _activityID =
    CALCULATE (
        SELECTEDVALUE ( ActivityTable[ACTIVITY_ID] )
    )
VAR _selectedDatetime =
    CALCULATE (
        SELECTEDVALUE ( 'Table'[DATETIME] ),
        FILTER (
            ALL ( 'Table' ),
            'Table'[ACTIVITY_ID] = _activityID
        )
    )
VAR _minTime =
    _selectedDatetime
        - TIME ( 1, 0, 0 )
VAR _maxTime =
    _selectedDatetime
        + TIME ( 1, 0, 0 )
VAR _datetimeinrow =
    CALCULATE (
        SELECTEDVALUE ( 'Table'[DATETIME] )
    )
VAR _result =
    IF (
        _datetimeinrow >= _minTime
            && _datetimeinrow <= _maxTime,
        "Show",
        "Hide"
    )
RETURN
    _result

Now you can apply visual level filter 

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