data of a trigger on channel timming

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  Hello world

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  ----

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  1-

  If I have to create 3 is of the order: f_order_created, f_order_approved, f_order_closed and join each other on these columns d-time?

  f_order_created.created_Date = d - time.day_id

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  2-do you create my fine measure?

  Hello anonymous user,.

  The approach with three done alias that you then use in three separate sources of logical table for your logical fact is the right one. This way, you keep canonical once and did do the role play.

  So you won't need to 3 facts in the layer of logic that you ask above, but only 3 LTS. Physically, you need 3 alias joined the dimension of time with the join specifications you mention of course.

  PS: Jeff wrote about this a few years if you want to take a look.

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  Thank you!

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• Can't see the rise on a USB 6212 BNC channel time

  Hello

  I use an acquisition of data NI USB 6212 BNC to monitor the rise time. A single channel (AO0) is used to define a voltage all followed another channel (AI1). The problem I have is that I'm not able to see the rise on AI1 time, only a jump to the specified voltage.

  I started to edit one of the material examples. Initially, I have connected the two channels via a BNC connector to BNC cable but thought I better with a simple circuit. I set up a resistance on a model and connected my channels accordingly with crocodile clips. Unfortunately, the result remained the same and all I see is a jump to the previous setting in tension (usually 0) to the new I entered with a infinite slope (vertical line).

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  Yusif Nurizade,

  What type of signal you generate on the AO line? The default value in the output array is a single element zero. That didn't exactly have a rise time!

  To measure rise times sampling on the line frequency should be fast enough to get samples of several over the course of the rising part of the measured waveform.

  The signal on the AO line will always be in the steps from one value to another. This is the way of working with D/A converters. 6212 specifications indicate a speed of 5 V / us. If two successive samples were 0 to 10 v it would take exit 4 move us from one value to another. Same samplng HAVE it line 400 kech. / s, you would get no more than an intermediate value and would not be able to measure the rise time.

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• CQL join with 2-channel time-stamped application

  Hello
  
  I am trying to join the two channels that are time-stamped application, both are total-ordered. Each of these 2 channels retrieve data in a table source.
  
  The EPN is something like this:
  
  Table A-> processor A-> A channels->
  JoinProcessor-> channel C
  Table B-> processor B-> B-> channel
  
  My question is, how are "simulated" in the processor events? The first event that happens in any channel and the Treaty as the timestamp, starting point get it? Or fact block treatment until all channels have published its first event?
  
  Channel A
  --------------
  timestamp
  1000
  6000
  
  
  Channel B
  -------------
  timestamp
  4000
  12000
  
  Channel B arrived both of system a little later due to the performance of the db,
  
  I would like to know if the following query won't work, whereas I would like to match the elements of channel A and B which are 10 sec window and out matches once in a stream.
  
  The following query is correct?
  
  Select a.*
  A [here], B [slide 10 seconds of range 10 seconds]
  WHERE a.property = b.property
  
  
  I'm having a hard time to produce results of the join well I checked the time stamp of application on each stream and they are correct.
  What could possibly cause this?
  
  Thank you!
  
  Published by: Jarell March 17, 2011 03:19
  
  Published by: Jarell March 17, 2011 03:19

  Hi Jarrell,

  I went through your project that had sent you to Andy.

  In my opinion, the following query should meet your needs-

  ISTREAM (select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty)

  I used the test of CatSender and TrafficaSender data (I show only the part bparty fields and here and that too as the last 4 characters of each)

  TrafficaSender (, bparty)
  At t = 3 seconds, (9201, 9900)
  At t = 14 seconds (9200, 9909)
  To t = 28 seconds (9202, 9901)

  CatSender (, bparty)
  At t = 16 seconds, (9200, 9909)
  At t = 29 seconds (9202, 9901)

  For query q1 ISTREAM = (select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty)

  the results were-
  At t = 16 seconds, (9200, 9909)
  At t = 29 seconds (9202, 9901)

  and it seems OK for me

  Please note the following-

  (1) in the query above I do NOT require a "abs1(t.ELEMENT_TIME-c.ELEMENT_TIME)".<= 15000"="" in="" the="" where="" clause.="" this="" is="" because="" of="" the="" way="" the="" cql="" model="" correlates="" 2="" (or="" more)="" relations="" (in="" a="" join).="" time="" is="" implicit="" in="" this="" correlation="" --="" here="" is="" a="" more="" detailed="">

  In the above query, either W1 that designating the window TrafficaSender [range 15] and W2 means the CatSender [range 15] window.

  Now both W1 and W2 are evaluated to CQL Relations since in the CQL model WINDOW operation over a Creek gives a relationship.

  Let us look at the States of these two relationships over time

  W1 (0) = W2 (0) = {} / * empty * /.
  ... the same empty up to t = 2
  W1 (3) = {(9201, 9900)}, W2 (3) = {}
  same content for W1 and W2 until t = 13
  W1 (14) = {9201 (9900) (9200, 9909)}, W2 (14) = {}
  same content at t = 15
  W1 (16) = {9201 (9900) (9200, 9909)}, W2 (16) = {(9200, 9909)}
  same content at t = 17
  W1 (18) = {(9200, 9909)}, W2 (18) = {(9200, 9909)}
  same content at up to t = 27
  W1 (28) = {(9200, 9909), (9202, 9901)}, W2 (28) = {(9200, 9909)}
  W1 (29) = {(9202, 9901)}, W2 (29) = {(9200, 9909), (9202, 9901)}

  Now, the result.
  Let R = select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty

  It is the part of the application without the ISTREAM. R corresponds to a relationship since JOINING the 2 relationships (W1 and W2 in this case) that takes a relationship according to the CQL model.

  Now, here's the most important point about the correlation in the JOINTS and the implicit time role. R (t) is obtained by joining the (t) W1 and W2 (t). So using this, we must work the content of R over time

  R (0) = JOIN of W1 (0), W2 (0) = {}
  the same content up to t = 15, since the W2 is empty until W2 (15)
  R (16) = JOIN of W1 (16), W2 (16) = {(9200, 9909)}
  same content up to t = 28, even if at t = 18 and t = 28 W1 changes, these changes do not influence the result of the JOIN
  R (29) = JOIN of W1 (29), W2 (29) = {(9202, 9901)}

  Now the actual query is ISTREAM (R). As Alex has explained in the previous post, ISTREAM leads a stream where each Member in the difference r (t) - R (t-1) is associated with the t. timestamp applying this to R above, we get

  R (t) - R (t-1) is empty until t = 15
  (16) R - R (16 seconds - 1 nanosecond) = (9200, 9909) associated with timestamp = 16 seconds
  R (t) - R (t-1) is again empty until t = 29
  (29) R - R (29 seconds - 1 nanosecond) = (9202, 9901) associated with timestamp = 29 seconds

  This explains the output

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