API Functions
45
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ps2000pg.en-12
PicoScope 2000 Series Programmer's Guide
5.23
ps2000SetAdvTriggerDelay
int16_t ps2000SetAdvTriggerDelay
(
int16_t handle,
uint32_t delay,
float preTriggerDelay
)
This function sets the pre-trigger and post-trigger delays. The default action, when both these
delays are zero, is to start capturing data beginning with the trigger event and to stop a
specified time later. The start of capture can be delayed by using a non-zero value of
delay.
Alternatively, the start of capture can be advanced to a time before the trigger event by using
a negative value of
preTriggerDelay.
If both arguments are non-zero then their effects
are added together.
Applicability
PicoScope 2202, 2204, 2204A, 2205 and 2205A only
Arguments
handle
: the handle of the required oscilloscope
delay
: the post-trigger delay, measured in sample periods. This is the time
between the trigger event and the sample at time
t
= 0. For example, at a
timebase
of 50 MS/s, or 20 ns per sample, and with
delay = 100,
the
post-trigger delay would be 100 20 ns = 2 µ s.
Range: [0, 2
32
–1]
preTriggerDelay
: the location of the sample at time
t
= 0 within the
data block, as a percentage of the data block length. 0% places
t
= 0 at the
start of the block, –50% places it in the middle, and –100% places it at the
end. Positive values can also be used to place
t
= 0 before the beginning of
the data block, but the
delay
argument is more convenient for this
purpose as it has a wider range.
Range: [–100%, +100%]
Returns
0: if unsuccessful, or if one or more of the arguments are out of range
non-zero: if successful
Example 1:
delay
= 0,
preTriggerDelay
= –50%
Example 2:
delay
= 1 ms,
preTriggerDelay
= –50%
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