2-3-2 Section 2: Using Digital InstrumentsST290 Instrument System Owner’s HandbookIf you want to use a different operating profile, or edit a custom profile,refer to Section 7, Chapter 3, Setting Up Data Displays.3.2 OperationGetting startedAt power up, each digital instrument is in Normal mode, using the oper-ating profile that was in use when the instrument was last switched off.Note: When an instrument is switched on for the first time after installa-tion, an operating profile must first be selected. See Section 2, Chapter 1for details.Selecting active display areaIn Normal mode, the upper and lower displays update continuously toshow the current data in their respective chapters.In order to make any changes to either display area (for example, to selectanother page or chapter), you must first select that area as the activedisplay area. To do this, use the or button, to move the active displayindicator to the required display area (see Figure 3-2 ).Figure 3-2: Selecting the adjustable display areaSelecting chapters & pagesChaptersTo select a different chapter in either display area (upper or lower):1. Use the or button to select the required active display area(see Figure 3-2 ). The active display indicator moves to the selectedarea.HEADINGDEPTH FTHEADINGDEPTH FTUpper display active Lower display activeD5371-1ActivedisplayindicatorActivedisplayindicator81183_2 S2.book Page 2 Tuesday, May 6, 2003 8:39 AM