Fluke PM6681R Benutzerhandbuch
*OPC reports when operation is com-
plete, via the Status Subsystem described
on page 6-14.
Rough Trigger
Subsystem
Description
The trigger subsystem is the functional
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-
quence.
A simplified model of the CNT-8X’s trig-
A simplified model of the CNT-8X’s trig-
ger subsystem is a state-machine with
four different states. These states are as
follows:
IDLE State
–
IDLE State
–
The counter waits for new commands. It is
not measuring
WAIT_FOR_BUS_ARM State
–
–
The counter is ready to receive a bus arm-
ing signal, GET or XTRG.
WAIT_ FOR_MEASUREMENT_TO_
START State
–
–
The counter waits for the input signal trig-
gering to start the measurement or block of
measurements. If the counter uses arming,
it is waiting for the specified arming event.
MEASUREMENT State
–
–
The counter measures. It monitors the
hardware and controls the measurement
time. If block measurement mode is used,
(ARM:COUN or TRIG:COUN8³2) the
counter stays in this state until all measure-
ments inside the block has been made.
Different actions cause the trigger sub-
system to change between the different
states. The transitions are shown in . The
status is reflected in status byte
:STATus:OPERation:CONDition.
How to Measure Fast
Rough Trigger Subsystem Description 7-3
S t a t e : I D L E
O p e r a t i o n C o n d i t i o n
r e g i s t e r s t a t u s : 2 5 6
S t a t e :
W A I T F O R B U S A R M
O p e r a t i o n C o n d i t i o n r e g i s t e r
s t a t u s : 3 2 0
S t a t e :
W A I T F O R E X T A R M a n d / o r
I N P U T T R I G
O p e r a t i o n C o n d i t i o n r e g i s t e r
s t a t u s : 2 8 8
S t a t e :
M E A S U R E
O p e r a t i o n C o n d i t i o n
r e g i s t e r s t a t u s : 1 6
I N I T
I N I T : C O N T O N
o r
I N I T : C O N T O F F
O r a l l m e a s u r e m e n t s
c o m p l e t e d
B u s t r i g r e c e i v e d o r
O F F ( i m m e d i a t e )
A l l A R M a n d T R I G
l o o p s c o m p l e t e d
( A r m i n g r e c e i v e d o r
a r m o f f ( i m m e d i a t e ) )
a n d i n p u t t r i g
S i n g l e m e a s u r e m e n t
r e a d y
Figure 7-1
Trigger subsystem states.