Yes ST ji. Unlike price where the levels remain same across all time frames. OBV has different values in different time frames. As 1min.OBV is the truest picture because it is not impacted by vagaries of 1/2/3/4 and 5th minute of 5min.charts it is most dependable. By following the DOW principle also in 1min.charts you are better equipped to capture the highs and lows of the day to the T.