6221 2182 A to draw IV of FET

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• 5V power supply seems to have failed on PCI-6221

  I recently had a test set-up down, and it seems that this could be linked to the + 5v supply.

  When I connect 5v to the unit via an external power supply Board, the Board draws 50ma, far as the 1A, according to me, the PCI-6221 power is specified as being able to provide.  When I connect the camera Board to the PCI-6221 via cable, only 0.67v are measured on the map.  However, when the cable is not connected to the card of the unit, I measure 4.5V on the power supply 5v card PCI-6221.

  I couldn't find a standard of accuracy for the power supply of 5v, but I expected to be less than 0, 5V.  It seems that my PCI-6221 power can produce a voltage in open circuit, but decreases rapidly under a load condition, which seems that the jury didn't.

  Ideas?  Thanks in advance.

  Hi Scott,.

  Terminal on the 6221 5V is rail 5V PCI bus with some type of lighter, so the accuracy will depend on the computer's power. Would you be able to try this card in a machine that has a work data acquisition card? This would exclude any power problem on this computer. If this test fails, it is likely that there is a fuse and you will need to contact us as Josh mentioned for an RMA number.

• Delay between angle and entered analog on a 6221

  Hello

  my test setup consists of a (8184 current run LabVIEW RT) embedded PXI controller which uses a PXI-6221 of data acquisition. One of the outputs analog of the 6221 creates a demand for speed that is sent to a servo controller. the servo drives then the test configuration. Between the servo and the remaining test configuration, a quadrature encoder is located. Both the 6221 meters are used to measure the position of the servo (using the trains of pulses A and B) as well as the speed of the servo (frequency of A pulse train). In addition to these counter inputs, some analog inputs of the 6221 serve as well to recored the configuration of test signals.

  In this configuration, one of the analog signal has a frequency of n periods per revolution of servo (determined by the mechanical design of the test facility). But when I leave the servo turn to for example 100 rpm, then decelerate from status quo with a constant deceleration and then draw the analog signal against the measured angle, I see clearly that as long as the speed is telling, I n periods per turn (or a passage from my analog AC to zero each 1/2n towers); However, as soon as the slowdown begins, the plot gets stretched along the axis of the angle (so the plot tells me there are less than n analog periods per turn, which is impossible because it would require the mechanical destruction of the facility).
  However, I can calculate a position based on speed information signal, as I got to the second counter (by integration of the speed). When I do this for the above velocity profile and draw the analog signal against the calculated angle, I see exactly n times / revolution, no matter how fast the installation program is rotating (just the expected behavior).

  So, apparently, the speed measured is "in phase" with analog signals, while the measured angle has a "phase error. Draw the angles measured and calculated against the time tells me the same thing: the measured angle is always late (compared to the calculated angle). The period is not constant throughout the measurement; I've seen values between 30 and 170 ms within a single record. Due to this change of variable, inserting a delay for all channels, but the angle is not a great idea.

  Unfortunately, calculation of the position of the speed signal is no option for me, because the direction of rotation is changed during measurement; because speed information I have based simply on a frequency of pulse train, it contains no information management, therefore a calculated position would be unaware of the changes of direction.

  Does anyone have an idea whence thios delay and what I can do to fix this problem?
  Try a position different methods of decoding or exchanging the meter channels has not made a difference.

  Thank you!

  Hey Kevin,

  attached you will find the last block diagram (no new translation this time, since no changes have been made that require a), which includes your last suggestions (explicitly start the task of AI, remove the excess constraints) with a flat sequence structure that applies all the preparations of task to finish before the start of the first task (I know I could have achieved the same effect of intelligent routing of the signal error, but I think the code is) better readable this way).

  Without OPI, LabVIEW tends to start to have, ao and tasks of the angle of the very different moments, which (for some reason that I don't understand - we have a sample clock based calendar here, and the sample clock is run, well after the three mentioned tasks...) tends to cause delays in the order of several 10-100 ms between tasks. With the structure, this problem is eliminated.

  The Sub - VI just above DAQmx writing contains the "conduct" code that I used in the last screen shot to "serialize" the requested speeds - in this way, the table that contains the requirements of speed does not need to be rebuilt.

  The code that creates a weather channel frequency implicitly timed measure left the VI shown here in a second VI that is running on the host computer, because everything that involves a calculation and does not require any intzeraction with the DAQ hardware is better placed there (the 850 MHz on the PXI controller celeton is slower than 2 definitiely something host GHz Dual-Core system).

  The behavior you mentioned for the task "not started" HERE is what wrote using LabVIEW. I thought the block of relaxation that I had at the beginning would treat the start of the task - at least, the code like this figure repeatedly in the examples that come with LabVIEW.

  I don't really understand what has caused the problems I've had - it seems that it was the combination of the measure quickly loop iteration with the start of task based on trigger HERE, but I do not understand what are the mechanisms in the background caused the problem (too forced loop was not the cause; the same block diagram works well with an additional loop timer).

  If the solution was composed of the following steps:

  -remove the old code calculating speed, replace it with a better code out of the main loop. This allows to

  -reduce considerably the frequency of the main loop.

  -Pull the DAQmx writing out of the loop, and

  s ' ensure that all tasks are started explicitly just before the main loop starts to run.

  -Possibly remove excess constraints of the main loop.

• I have a PCI-6221 NIC connected to a block of connection TBX-68. How can I see the wiring for the analog channels with MAX?

  Hi all

  I have a PCI-6221 NIC connected to a block of connection TBX-68. Once I found a drawing that shows me all the connections on my block of connection for each analog input tasks. I don't see this option now. Can someone describe to me how I can find this new?

  
  

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  Is there another way to have the design freehand in languages other than English (when the letters are almost the same as Italian, except accented) or Chinese (we have seen Chinese working during the keynote)?

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  The problem is that I don't see the design freehand in messages button, I know where it should be, but he's not here.

  I'm from Belgium, idk if this is because he is not yet available in Belgium, but I can't find anything about it on the internet. My brother has the same problem.

  Hello

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  I'm working on an HTML5 canvas game, where some areas need to be stretched connceted in sort of a "blob" of circles.

  The code to draw using im looks like this, and an example can be found on github:
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  Hello Patrick,.

  Thank you for coming back to me. For some reason any, that I found my problem, it was not really related to the order of the code, but which drew a circle, and then plotting another circle further, without using a "canvasObject.moveTo" - there is another draw of line as the 'pencil' moves to the location of the new circle, creating a kind of intersection.

  I initially thought it was a kind of record, but this time there it a certain sense - think of a turtle drawing engine.

  In any case, thanks for responding!

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