Spectrum M2p.59 Series, Руководство по оборудованию, Страница: 106 / 190

106 (c) Spectrum Instrumentation GmbH
Main analog external trigger (Ext0) Trigger modes and appendant registers
Pulsewidth trigger for long positive pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed trigger level is crossed by
the channel’s signal from lower to higher values (rising
edge) the pulsewidth counter is started. If the signal crosses
the trigger level again in the opposite direction within the
the programmed pulsewidth time, no trigger will be detect -
ed. If the pulsewidth counter reaches the programmed
amount of samples, without the signal crossing the trigger
level in the opposite direction, the triggerevent will be de -
tected.
The pulsewidth trigger modes for long pulses can be used
to prevent the board from triggering on wrong (short) edges
in noisy signals.
Pulsewidth trigger for long negative pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed trigger level is crossed by
the channel’s signal from higher to lower values (falling
edge) the pulsewidth counter is started. If the signal crosses
the trigger level again in the opposite direction within the
the programmed pulsewidth time, no trigger will be detect -
ed. If the pulsewidth counter reaches the programmed
amount of samples, without the signal crossing the trigger
level in the opposite direction, the triggerevent will be de -
tected.
The pulsewidth trigger modes for long pulses can be used
to prevent the board from triggering on wrong (short) edges
in noisy signals.
Pulsewidth trigger for short positive pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed trigger level is crossed by
the channel’s signal from lower to higher values (rising
edge) the pulsewidth counter is started. If the pulsewidth
counter reaches the programmed amount of samples, no
trigger will be detected.
If the signal does cross the trigger level again within the the
programmed pulsewidth time, a triggerevent will be detect -
ed.
Register Value Direction set to Value
SPC_TRIG_EXT0_MODE 40510 read/write SPC_TM_POS | SPC_TM_PW_GREATER 04000001h
SPC_TRIG_EXT0_LEVEL0 42320 read/write Set it to the desired trigger level in mV mV
SPC_TRIG_EXT0_PULSEWIDTH 44210 read/write Sets the pulsewidth in samples. Values from 2 to [4G -1] are allowed. 2 to [4G -1]
Register Value Direction set to Value
SPC_TRIG_EXT0_MODE 40510 read/write SPC_TM_NEG | SPC_TM_PW_GREATER 04000002h
SPC_TRIG_EXT0_LEVEL0 42320 read/write Set it to the desired trigger level in mV mV
SPC_TRIG_EXT0_PULSEWIDTH 44210 read/write Sets the pulsewidth in samples. Values from 2 to [4G -1] are allowed. 2 to [4G -1]
Register Value Direction set to Value
SPC_TRIG_EXT0_MODE 40510 read/write SPC_TM_POS | SPC_TM_PW_SMALLER 02000001h
SPC_TRIG_EXT0_LEVEL0 42320 read/write Set it to the desired trigger level in mV mV
SPC_TRIG_EXT0_PULSEWIDTH 44210 read/write Sets the pulsewidth in samples. Values from 2 to [4G -1] are allowed. 2 to [4G -1]