Trigger modes and appendant registers
External (analog) trigger
(c) Spectrum GmbH
95
Low level trigger
This trigger mode will generate an internal gate signal that
can be useful in conjunction with a second trigger mode to
gate that second trigger. If using this mode as a single trigger
source the card will detect a trigger event at the time when
entering the low level (acting like negative edge trigger) or if
the trigger signal is already above the programmed level at
the start it will immediately detect a trigger event.
The trigger input is continuously sampled with the selected
sample rate. The trigger event will be detected if the trigger
input is below the programmed trigger level.
In window trigger
This trigger mode will generate an internal gate signal that
can be useful in conjunction with a second trigger mode to
gate that second trigger. If using this mode as a single trigger
source the card will detect a trigger event at the time when
entering the window defined by the two trigger levels (acting
like window enter trigger) or if the trigger signal is already
inside the programmed window at the start it will immediately
detect a trigger event.
The trigger input is continuously sampled with the selected
sample rate. The trigger event will be detected if the trigger
input is inside the programmed trigger window.
Outside window trigger
This trigger mode will generate an internal gate signal that
can be useful in conjunction with a second trigger mode to
gate that second trigger. If using this mode as a single trigger
source the card will detect a trigger event at the time when
leaving the window defined by the two trigger levels (acting
like leaving window trigger) or if the trigger signal is already
outside the programmed windo at the start it will immediately
detect a trigger event.
The trigger input is continuously sampled with the selected
sample rate. The trigger event will be detected if the trigger
input is outside the programmed trigger window.
Register
Value
Direction
set to
Value
SPC_TRIG_EXT0_MODE
40510
read/write
SPC_TM_LOW
00000010h
SPC_TRIG_EXT0_LEVEL0
42320
read/write
Set it to the upper trigger level in mV
mV
Register
Value
Direction
set to
Value
SPC_TRIG_EXT0_MODE
40510
read/write
SPC_TM_INWIN
00000080h
SPC_TRIG_EXT0_LEVEL0
42320
read/write
Set it to the upper trigger level in mV
mV
SPC_TRIG_EXT0_LEVEL1
42330
read/write
Set it to the lower trigger level in mV
mV
Register
Value
Direction
set to
Value
SPC_TRIG_EXT0_MODE
40510
read/write
SPC_TM_OUTSIDEWIN
00000100h
SPC_TRIG_EXT0_LEVEL0
42320
read/write
Set it to the upper trigger level in mV
mV
SPC_TRIG_EXT0_LEVEL1
42330
read/write
Set it to the lower trigger level in mV
mV
