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M3i.48xx / M3i.48xx-exp Manual
External (analog) trigger
Trigger modes and appendant registers
Window trigger for entering signals
The trigger input is continuously sampled with the selected
sample rate. The upper and the lower level define a win-
dow. Every time the signal enters the window from the out-
side, a trigger event will be detected.
Window trigger for leaving signals
The trigger input is continuously sampled with the selected
sample rate. The upper and the lower level define a win-
dow. Every time the signal leaves the window from the in-
side, a trigger event will be detected.
High 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 high level (acting like positive 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 above the programmed trigger level.
Register
Value
Direction
set to
Value
SPC_TRIG_EXT0_MODE
40510
read/write
SPC_TM_WINENTER
00000020h
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_WINLEAVE
00000040h
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_HIGH
00000008h
SPC_TRIG_EXT0_LEVEL0
42320
read/write
Set it to the upper trigger level in mV
mV
