Spectrum M2p.59 Series, Hardware Manual, Page: 142 / 190

142 (c) Spectrum Instrumentation GmbH
Trigger Mode Gated Sampling
Channel triggers modes
For all channel trigger modes, the OR mask must contain the corresponding input channels (channel 0 taken as example here):.
Channel trigger on positive edge
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 values to higher values (ris -
ing edge) the gate starts.
When the signal crosses the programmed trigger 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 trigger HIGH level
The analog input is continuously sampled with the selected
sample rate. If the signal is equal or higher than the pro -
grammed trigger level the gate starts.
When the signal is lower than the programmed trigger level
the gate will stop.
As this mode is level-triggered, the high level at the cards
start time does trigger the board.
Channel trigger on negative edge
The analog input is continuously sampled 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 trigger from low -
er 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.
Register Value Direction Description
SPC_TRIG_CH_ORMASK0 40460 read/write Defines the OR mask for the channel trigger sources.
SPC_TMASK0_CH0 1h Enables channel0 input for the channel OR mask
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_POS 1h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger 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 8h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger 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 2h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the desired trigger level relatively to the channel’s input range. board dependant