You can either set a specific (i.e., fixed) time window (for reviewing a historical event) or you can set a time window relative to the current time (the default setting, used for monitoring incoming data in real-time).
To set or change the time window:

  1. From the Acquisition tab (Figure 1), for the default Time Window, CWMS assumes that you want to monitor incoming data, so Relative to Current Time is selected. If you want to view historical data, you must select Specific Time Window (Figure 1).
  2. If you would like to set the Time Window (Figure 1) relative to the current date and time, select the Relative to Current Time and enter the Look Back Time and select either Days or Hours as the time unit. Normally you will set the time window to extend backward one to thirty days from the current time. Optionally, you can enter a Look Ahead Time and select either days or hours; this allows you to look ahead at data.
  3. If you would like to set a historical Time Window (Figure 1), select Specific Time Window and enter the Start Date and Time of the time window and the End Date and Time of the time window for the historic data.
  4. Click Refresh (Figure 1) to complete the time window change.