4.4 Thresholding (Zero-Suppress - ZS1 option)
Acqiris SA220P User's Manual 57
In the marker stream, the trigger markers and the gate markers are returned in block of 32 bits.
Markers issued by a gated-record are completed by "dummy gate marker" (identified with header
0x08), to fit memory alignment constraint.
Example
Figure 4.8 - Example of marker header block: There are 3 gates in the triggered record and the 512-bit marker block
is completed by dummies.
Control IO interface
Using the ADC card input IO 2 and a "trigger enable" signal, user can also control the records
acquired or ignored.
In-TriggerEnable (IO 2): This signal controls the acquisition sequence by checking its value only for
each trigger. If the trigger enable is '1' at the time of the trigger, the record will be acquired and
processed. By the contrary, if the trigger enable is '0', the trigger is ignored.
Parameters
The Hysteresis range value is [100 ; 1023].
The Threshold range value is [Hysteresis-32768 ; +32767].
The Threshold and Hysteresis is are entered in ADC code.
The PreGateSamples specifies the minimum number of samples to be kept before the gate start
condition. Possible values are 0, 1, ProcessingBlockSize, 2xProcessingBlockSize or
3*ProcessingBlockSize.
With ProcessingBlockSize = 8 for the SA220P.
The PostGateSamples specifies the minimum number of samples to be kept after the gate stop
condition. Possible values are 0, 1, ProcessingBlockSize, 2xProcessingBlockSize or
3*ProcessingBlockSize.
The ZeroValue is the value used to replace suppressed data samples in the waveform construct,
in digitizer mode without streaming.
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