Fluke PM3370B user manual Timebase Modes, Text OFF

FUNCTION REFERENCE 5 - 73

Key sequence:

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Toggle key to cycle through three states of information given in CRT viewing area.

TIMEBASE MODES

Description:

The Main Timebase (MAIN TB) can function in three different modes : AUTO, TRIG, or SINGLE. The choice is mainly determined by the frequency of the trigger signal. The modes are explained below.

AUTO	In ‘auto’ mode, the MAIN TB always gives a display, even when
	no signal is present. It checks for the occurrence of the trigger
	signal for some 100 ms, but if none is found, it automatically
	starts a new sweep or acquisition. On repetitive signals this mode
	is most common except for signal frequencies lower than 10 Hz
	where unstable displays will occur.
TRIG	In the triggered (trig) mode, traces are displayed only when the
	MAIN TB is actually triggered by a signal. This mode is
	recommended for frequencies lower than 10 Hz because it
	assures a stable display. The ARM’D indicator indicates if no
	trigger occurs.
SINGLE	In single shot mode, the MAIN TB runs only once after a trigger.
	Pressing the SINGLE key resets the scope for single shot
	operation; the trigger level is automatically set to 0.5 division
	above ground (indicated by T-). The ARM’D indicator lights when
	the MAIN TB is waiting for a trigger (MAIN TB armed). The single
	mode is used to capture and observe (photograph) events that
	happen only once.

In the digital mode the single mode can be used in combination with pre-triggering to observe and store single events, along with signal information occurring before the trigger point.

Auto, trig, and single can be chosen in the menu under the TB MODE menu key.

In the digital mode the TB MODE menu is expanded to include MULTI (only with the optional MATH+ functions installed), ROLL and REAL TIME ONLY mode.