Spectrum M2p.59 Series, Руководство по оборудованию, Страница: 146 / 190

146 (c) Spectrum Instrumentation GmbH
Trigger Mode Gated Sampling
Channel window trigger for long inner signals
The analog input is continuously sampled with the selected
sample rate. The upper and the lower levels define a win -
dow. Every time the signal enters the window from the out -
side, the pulsewidth counter is started. If the signal leaves
the window before the pulsewidth counter has stopped, no
trigger will be detected.
When the pulsewidth counter stops and the signal is still in -
side the window, the gate will start.
When the signal leaves the window from the inside to the
outside, the gate will stop.
Channel window trigger for long outer signals
The analog input is continuously sampled with the selected
sample rate. The upper and the lower levels define a win -
dow. Every time the signal leaves the window from the in -
side, the pulsewidth counter is started. If the signal enters
the window before the pulsewidth counter has stopped, no
trigger will be detected.
When the pulsewidth counter stops and the signal is still out -
side the window, the gate will start.
When the signal enters the window from the outside to the
inside, the gate will stop.
Channel hysteresis trigger on positive 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 trigger level is crossed by the channel’s
signal from lower values to higher values (rising edge) the
gate starts.
When the signal crosses the programmed hysteresis 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.
Register Value Direction set to Value
SPC_TRIG_CH0_MODE 40610 read/write SPC_TM_WINENTER | SPC_TM_PW_GREATER 04000020h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the upper trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_LEVEL1 42300 read/write Set it to the lower trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_PULSEWIDTH 44101 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_CH0_MODE 40610 read/write SPC_TM_WINLEAVE | SPC_TM_PW_GREATER 04000040h
SPC_TRIG_CH0_LEVEL0 42200 read/write Set it to the upper trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_LEVEL1 42300 read/write Set it to the lower trigger level relatively to the channel’s input range. board dependant
SPC_TRIG_CH0_PULSEWIDTH 44101 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_CH0_MODE 40610 read/write SPC_TM_POS | SPC_TM_HYSTERESIS 20000001h
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