Spectrum Brands MC.31XX - Manual (Page 73)

Trigger modes and appendant registers Channel Trigger
(c) Spectrum GmbH 73
Channel steepness trigger for steep positive pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed lower 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 with-
out the signal crossing the higher level, no trigger will be
detected.
If the signal does cross the upper level within the the pro-
grammed pulsewidth time, a triggerevent will be detected.
Channel steepness trigger for steep negative pulses
The analog input is continuously sampled with the selected
sample rate. If the programmed upper level is crossed by
the channel’s signal from higher to lower values (falling
edge) the pulsewidth counter is started. If the pulsewidth
counter reaches the programmed amount of samples with-
out the signal crossing the lower level, no trigger will be de-
tected.
If the signal does cross the lower level within the the pro-
grammed pulsewidth time, a triggerevent will be detected.
Register Value Direction set to Value
SPC_TRIGGERMODE 40000 r/w TM_CHANNEL 20040
SPC_TRIGGERMODE0 40200 r/w TM_CHXPOS_SS 10004
SPC_HIGHLEVEL0 42000 r/w Set it to the desired upper level relatively to the channel’s input range. board dependant
SPC_LOWLEVEL0 42100 r/w Set it to the desired lower level 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_SS 10014
SPC_HIGHLEVEL0 42000 r/w Set it to the desired upper level relatively to the channel’s input range. board dependant
SPC_LOWLEVEL0 42100 r/w Set it to the desired lower level relatively to the channel’s input range. board dependant
SPC_PULSEWIDTH 44000 r/w Set to the desired pulsewidth in samples. 2 to 255