Spectrum M2p.59 Series, Руководство по оборудованию, Страница: 121 / 190

Trigger modes and appendant registers Channel Trigger
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Channel re-arm 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 re-arm/hysteresis level is crossed from
higher to lower values, the trigger engine is armed and
waiting for trigger. If the programmed trigger level is
crossed by the channel’s signal from higher values to lower
values (falling 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 lower values to
higher values (rising 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.
High level hysteresis trigger
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 signal is equal or higher than the programmed trigger
level the gate starts.
When the signal is lower than the programmed hysteresis lev -
el the gate will stop.
As this mode is level-triggered, the high level at the cards start
time does trigger the board.
Low level hysteresis trigger
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 signal is equal or lower than the programmed trigger
level the gate starts.
When the signal is higher than the programmed hysteresis
level the gate will stop.
As this mode is level-triggered, the high level at the cards start
time does trigger the board.
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_NEG | SPC_TM_REARM | SPC_TM_HYSTERESIS 21000002h
SPC_TRIG_CH0_LEVEL0 42200 read/write Defines the 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
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_HIGH | SPC_TM_HYSTERESIS 20000008h
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_LOW | SPC_TM_HYSTERESIS 20000010h
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