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LTTTrigger_SetPreTrigger
Declaration:
long __stdcall LTTTrigger_SetPreTrigger (
unsigned long dwpretrigger
unsigned long dwPreSampleTimeSlow
);
Description:
Sets the pretrigger length per channel. Units are in kilo samples.
For example, desired is a 500ms pretrigger using a 400ns sampling rate. The
pretrigger length is calculated.
Must be integer number so either 122 (499.7 ms) or 123 (503.8ms) are valid
pretrigger is only allowed under certain conditions. Per devices only one or a pair
number of active channels are allowed.
The pretrigger length is limited to 60 Megasamples (120*1024*1024 byte).
So with 6 active channels the maximum pretrigger per channel is 10 Megasamples.
Input:
dwpretrigger
length of pretrigger as multiples of kilo-sample blocks
dwPreSampleTimeSlow
sample time in [ns] for pretrigger phase
can be zero ( pretrigger clock equals posttrigger clock )
Return:
0
OK
-1
No trigger active
-2
Wrong pretrigger length
Beschreibung der DLL LTT2API
500 000 000 ns ( 1 Sample / 400 ns ) = 125 000 samples
125 000 samples / ( 1024 samples ) = 122.070
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Handbuch Version 3.11
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