Fluke PM6681R Structure of the Idle and Initiated States, Structure of an Event-detection Layer

Using the Subsystems

This trigger configuration is sufficient for most instruments. More complex instru- ments, such as the CNT-8X, have more ARM layers.

The ‘Wait for TRIG’ event-detection layer is always the last to be crossed be- fore instrument actions can take place.

Structure of the IDLE and INITIATED States

When you turn on the power or send *RST or :ABORT to the instrument, it sets the trigger system in the IDLE state; see .

The trigger system will exit from the IDLE state when the instrument receives an INITiate:IMMediate. The in- strument will pass directly through the INITIATED state downward to the next event-detection layers (if the instrument contains any more layers).

The trigger system will return to the INI- TIATED state when all events required by the detection layers have occurred and the instrument has made the intended measurement. When you program the trigger system to INITiate:CONTin- uous ON, the instrument will directly exit the INITIATED state moving down- ward and will repeat the whole flow de-

scribed above. When INITiate:CONTinuous is OFF, the trigger system will return to the IDLE state.

		I D L E
* R S T		s t a t e
A B O R t
p o n
	N o
	I N I T [ : I M M ] o r
	I N I T : C O N T O N ?
	Y e s
	N o	I N I T I A T E D
		s t a t e
	I N I T [ : I M M ] o r
	I N I T : C O N T O N ?
	Y e s

Figure 6-16Flow diagram of IDLE and INITIADED layers.

￿Structure of an Event-detection Layer

The general structure of all event-detection layers is identical and is roughly depicted by the flow diagram in

In each layer there are several program- mable conditions, which must be satisfied to pass by the layer in a downward direc- tion:

￿Forward Traversing an Event-detection Layer

After initiating the loop counters, the in- strument waits for the event to be de- tected. You can select the event to be detected by using the <layer>:SOURce

command. For example:

:ARM:LAYer2:SOURce BUS

You can specify a more precise character- istic of the event to occur. For example:

:ARM:LAYer:DELay 0.1

You may program a certain delay be- tween the occurrence of the event and en- tering into the next layer (or starting the device actions when in the TRIGger

6-28 Trigger/Arming Subsystem