Spectrum M2p.59 Series, Hardware Manual, Page: 120 / 190

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Channel Trigger Trigger modes and appendant registers
Channel hysteresis trigger on positive edge
This trigger mode will generate an internal gate signal that
can be useful for masking a second trigger event generated
by a different mode. The analog input is continuously sam -
pled with the selected sample rate.
If the programmed trigger level is crossed by the channel’s
signal from lower values to higher values (rising edge) the
gate starts.
When the signal crosses the programmed hysteresis level
from higher values to lower values (falling edge) then the
gate will stop.
As this mode is purely edge-triggered, the high level at the
cards start time does not trigger the board.
Channel hysteresis trigger on negative edge
This trigger mode will generate an internal gate signal that
can be useful for masking a second trigger event generated
by a different mode. The analog input is continuously sam -
pled with the selected sample rate.
If the programmed trigger level is crossed by the channel’s
signal higher values to lower values (falling edge) the gate
starts.
When the signal crosses the programmed hysteresis level
from lower values to higher values (rising edge) then the
gate will stop.
As this mode is purely edge-triggered, the low level at the
cards start time does not trigger the board.
Channel re-arm hysteresis trigger on positive edge
This trigger mode will generate an internal gate signal that
can be useful for masking a second trigger event generated
by a different mode. The analog input is continuously sam -
pled with the selected sample rate.
If the programmed re-arm/hysteresis level is crossed from
lower to higher values, the trigger engine is armed and
waiting for trigger. If the programmed trigger level is
crossed by the channel’s signal from lower values to higher
values (rising edge) then the gate starts and the trigger en -
gine will be disarmed. If the programmed re-arm/hysteresis
level is crossed by the channel’s signal from higher values
to lower values (falling edge) the gate stops.
A new trigger event is only detected, if the trigger engine is armed again. The re-arm trigger modes can be used to prevent the board from
triggering on wrong edges in noisy signals.
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_POS | SPC_TM_HYSTERESIS 20000001h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_LEVEL1 42300 read/write Defines the hysteresis level relatively to the channel’s input range board dependant
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_NEG | SPC_TM_HYSTERESIS 20000002h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_LEVEL1 42300 read/write Defines the hysteresis level relatively to the channel’s input range board dependant
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_POS | SPC_TM_REARM | SPC_TM_HYSTERESIS 21000001h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_LEVEL1 42300 read/write Defines the re-arm and hysteresis level relatively to the channel’s input
range
board dependant