Spectrum Brands MC.31XX - Manual (Page 70)

70 MC.31xx Manual
Channel Trigger Trigger modes and appendant registers
Channel pulsewidth trigger for long positive pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed triggerlevel is crossed by
the channel’s signal from lower to higher values (rising
edge) the pulsewidth counter is started. If the signal crosses
the triggerlevel 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.
Channel pulsewidth trigger for long negative pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed triggerlevel is crossed by
the channel’s signal from higher to lower values (falling
edge) the pulsewidth counter is started. If the signal crosses
the triggerlevel 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.
Register Value Direction set to Value
SPC_TRIGGERMODE 40000 r/w TM_CHANNEL 20040
SPC_TRIGGERMODE0 40200 r/w TM_CHXPOS_LP 10001
SPC_HIGHLEVEL0 42000 r/w Set it to the desired triggerlevel relatively to the channel’s input range. board dependant
SPC_PULSEWIDTH 44000 r/w Set to the desired pulsewidth in samples. 2 to 255
Register Value Direction set to Value
SPC_TRIGGERMODE 40000 r/w TM_CHANNEL 20040
SPC_TRIGGERMODE0 40200 r/w TM_CHXNEG_LP 10011
SPC_HIGHLEVEL0 42000 r/w Set it to the desired triggerlevel relatively to the channel’s input range. board dependant
SPC_PULSEWIDTH 44000 r/w Set to the desired pulsewidth in samples. 2 to 255