Fluke PM6681R, PM6685R manual Rough Trigger, Subsystem, Description

			How to Measure Fast
*OPC reports when operation is com-	MEASUREMENT State
plete, via the Status Subsystem described	– The counter measures. It monitors the
on page 6-14.
	hardware and controls the measurement
	time. If block measurement mode is used,
	(ARM:COUN or TRIG:COUN￿￿2) the
Rough Trigger	counter stays in this state until all measure-
	ments inside the block has been made.
Subsystem	Different actions cause the trigger sub-
Description	system to change between the different
	states. The transitions are shown in . The
	status is reflected in status byte
The trigger subsystem is the functional	:STATus:OPERation:CONDition.
part of the CNT-8X that controls the start
and stop of measurements. This is the
function that the controller interacts with
when it controls the measurement se-			S t Ia Dt eL :E
quence.		O p e r a t io				n	C o n d it io n
		r e g is t2e5r6 s t a t u s :
A simplified model of the CNT-8X’s trig-
ger subsystem is a state-machine with
		I N Io Tr		I N I T : C O N T						O F F
four different states. These states are as
	I N I T : C O			NOTr Oa Nll s m e a s u r e m e n
follows:				c o m p le t e d
IDLE State
			S t a t e :
– The counter waits for new commands. It is		W A I T F O R B U S A R M
		O p e r a t io n C o n d it io n r e
not measuring
			s t a3t2u0s :
WAIT_FOR_BUS_ARM State
	B u s t r ig			r e c e iv e d					o r
– The counter is ready to receive a bus arm-				A ll A R M					a n d T R I G
	O F F		( im	m e d ia t e )
				lo o p s c o m p le t e d
ing signal, GET or ￿TRG.
WAIT_ FOR_MEASUREMENT_TO_			S t a t e :
		W A I T F O R				E X T A R M a n d /
START State
			I N P U T		T R I G
– The counter waits for the input signal trig-		O p e r a t io n C o n d it io n r e
			s t a2t8u8s :
gering to start the measurement or block of
	( A r m in g			r e c e iv e d o r
measurements. If the counter uses arming,
	a r m o f f			S in g le				m e a s u r e m e n
it is waiting for the specified arming event.				( im m e d ia t e ) )
	a n d			r e a d y
			in p u t			t r ig
			S t a t e :
			M E A S U R			E
		O p e r a t io				n C o n d it io n
		r e g is1t 6e r				s t a t u s :
	Figure 7-1Trigger subsystem states.
Rough Trigger Subsystem Description 7-3