Why is relativeInitalX value not taking into account the triggering delay? using scope OR with the PXI-5124

Hi all

play with a digitizer PXI-5124 in a case of PXI1042Q with a PXI8110 controller that runs labview 2012 (latest updates) with the latest version of the driver NIScope.

I put in place an acquisition of off-delay (by assigning the triggering delay, for example 20us) which works very well (I can tell by the signal I get delay control works correctly), but the data returned in the info wfm cluster (using the 2D version of niScope I16 Fetch) does not have this delay.

Description of the relativeInitialX within this cluster indicator indicates "is the time in seconds between the trigger and the first sample in the acquired waveform" but its never to return something around 1E-9 independent of trigger delay. Surely the relative initial x should reflect the triggering delay?

I'm doing something wrong?

Thanks for your help!

So, I made a screenshot of the image in the section "Trigger Delay" link I sent you.

Meaning of the symbol:

T0 = original moment of relaxation

T1 = time to trigger used in the acquired record (t1 = t0 + TriggerDelay)

T2 = time of first sample in the record of the acquis.

RX = relativeInitialX = t1 - t2

Response to previous reviews

«I understand what you're saying - so basically, if I want to know the delay of my trigger for the first sample in the record, I just add my delay time value to the relativeInitialX.»

  • Close, the delay of the original trigger (t0), for the first sample in the record (t2), would actually be TriggerDelay-relativeInitialX

«.. . Nowhere does graphically describe where is the relative value of initialX real. »

  • Right, relativeInitialX is not a timestamp, so it is not a place on the timeline, it is the difference between two timestamps (t1 and t2 above), where the relativeInitialX name.

 

"The trigger"record"is the straight line in the Middle, so expect relative to - 1/2 initialX record length?

  • Almost correct, because the reference trigger is relativeInitialX to the position of 50%, will be the time in seconds for 1/2 the record length. (i.e. If the registration has been long relativeInitialX, 2s = 1 s).  RelativeInitialX will always be the delta time between the trigger (t1) and the first sample returned in the record (t2).

  • For example using the picture above: If t0 is 10 sec, Trigger Delay = 3 sec, SampleRate = 1 kHz, = 1000 record size.  This means that t1 = 13 s.  Our record is long of 1s (1000 points to 1 DC between each = 1 s), if t2 = 12.5 sec.  If away from all these moments are absolute time, as the timestamps.  So relativeInitialX = t1 - t2 is 13-12, 5 = 0.5 sec.

  • As a side note, the reference position should not be 50%, you can configure to between 0-100%.

Time not yet discussed record attributes

I don't want to make you more confused, but there is another useful attribute in the waveform info that we've not yet discussed and its AbsoluteInitialX.  Starting from the NOR-SCOPE help file:"absoluteInitialX is the timestamp of the first sample of recoveries in seconds..." "So, using the above image, absoluteInitialX = t2.

I hope this helps.  If a part is still not clear, let me know.

-Nathan

Tags: NI Products

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