Trigger modes and appendant registers

Channel Trigger

 

 

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.

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

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_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

(c) Spectrum GmbH

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Image 73
Spectrum Brands MC.31XX manual Channel steepness trigger for steep positive pulses