A measure of speed high speed with encoder in quadrature and NI 9401 on cDaq

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• How to maximize speeds with a Broadcom AC and R7000 card?

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  I changed all the settings. Immediately made the signal to jump her four-bar and then slowly go down to 1 or 2. Not much difference in download speed.

  But, I got a new Optimum modem, one with Docsis 3.0, the Arris TG862G and she welcomed my dl speeds for up to approximately 7.0 MB/s. Much better.

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• Measure Z to a battery encoder encoder pulse frequency to measure the speed using a 6034 E card

  Hello

  I want to measure the speed of a motor that has an encoder to encoder hung on battery. It provides impulses 3 A, B and Z I uses a PXI 6034 E card. I wanted to know if there are any examples/ideas that could help me with this (I'm new to digital programming in Labview). I moved to NI Daqmx 9.8 recently of the old version that has supported the existing codes and therefore being updated the code. I also want to know if an external clock source is needed to do this. This.

  Hello

  There are several examples in the finder OR example (you can get here by going to help > find examples in a window of LabVIEW). You can browse examples of Encoder on input and output material > DAQmx > entry counter. You should be able to find some examples that will be useful.

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• Encoder speed and orientation on the NI 9401 in cDAQ-9172

  Hello, I have a module or 9401 for my cDAQ-9172 and she is now installed in five slot to connect a dual channel encoder. Channel A is connected to pin 14 and channel B to pin 17 and the encoder is powered by 5v dc.

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  Fix for this that I started the VI, who can count total impulses in the encoder.

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  Quintino Hi and sorry for not having answered quickly.

  Your VI works perfectly well for low frequencies with me. If you want to measure fairly high frequency (> 1 kHz), you may need to check how a measure of 2 meters. You will find an example attached (lv2009). Just plug the signal at the source of one of the meter (ctr0 for example), then set it to the value of the counter on the VI ctr0 control. Use a splitter too high (4 is fine). I was able to compete with the signals of 1 MHz on my Board.

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• By train and failing to carry out measures of speed

  Can someone explain to me how the linear speed CI module is supposed to work?  I tried with no successt for a while to use it to take measures to speed by using a meter.  I use a card NI 9411 digital input to accept a signal from a radar system which shows a maximum speed measured as a frequency (which is just working at a rising every 0.176 inches moved).

  Whenever I run VI I get an error in the module create channel which is as follows:

  Code:-200431

  Source: DAQmx create channel (CI-linear velocity) .vi:2530001
  Property: CI. MeasType
  asked the value: Speed: Linear encoder
  Possible values: Frequency, period, pulse width, period of Semi, separation of the two sides, pulse frequency, pulse, Pulse ticks, Position: angular encoder, Position: linear encoder, edges of County

  The task name: _unnamedTask<6>

  That, on a subject similar, is there any where a document that lists the module chassis DAQ and DAQmx measurement compatibility?  Because I do not find that documented anywhere it's obvious...

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  I'm actually very happy with the speed of encoding to DVD formats. I was under the impression that he was 'real-time' coding. Encoding 1 hour long PAL 48 kHz capture VHS to DVD only took about 30 m.

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  Justin.

  The two factors that most affect your rendering, as well as your speed of encoding are:

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• My speed has decreased between the router and the modem is not working properly, what can I do to increase the download speed with my Time Capsule 802.11n

  My speed has decreased between the router and the modem is not working properly, what can I do to increase the download speed with my Time Capsule 802.11n

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• Can satellite A500-17 X - I get full speed with router Linksys WRT120N WLan?

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  I don't have as much knowledge on wireless routers and that is why I ask.

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  I think your question should be posted in the forum of the manufacturer of the router and not here in the forum of Toshiba.

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• Speed with EG008W worm 3 problem

  This is my first time writing on a forum, so please forgive the long-winded explanation. I want to just make sure that I give all the details.

  I currently own a WRT54G and WRV54G, BEFSR41. My internet modem is connected directly to the WRV54G and the other two are directly related to the WRV54G also. The small network, I had was working completely fine and I never had problems.

  Last month, I bought an EG008W 3 worm in the hope of accelerating my internal network from my laptop (vista 64 home), my server HP ex485 smart media, and my PS3 all have gigabit cards.

  I removed the WRV54G WRT54G and connected the EG008W to WRV54G. Then I connected my laptop, my HP mediasmart ex485 server, my PS3 and WRT54G to the EG008W.

  I did not notice the changes of speed in the last month, so this week I decided to give it a try at low speed. Copy of 5 GB of files from my server on my laptop says it would take me 5 hrs. I connected my laptop to the WRT54G and tried to copy the same files, and it took a little less than 10 minutes. I connected the laptop to the EG008W and tried to copy the same files. I let it sit for 30 minutes and then abandoned.

  I did a session with Linksys chat and was told to return to the store. The store policy didn't allow exchanges, but they have test and that the EG008W worked well for them.

  I brought home and tried with the following, set up simple: WRV54G to EG008W Modem. Then I plugged in just the laptop and the server at EG008W. I copied the same 5 GB of files and first of all, it looked promising, but after 15 minutes, he said still 3 hours left. I would have liked a boost of my network speed, but whether slower than my wireless connection G isn't fair.

  I have cat5e wiring and cords connection. I kept the same wiring when I connect the switch to the router when you perform tests.

  Any help would be appreciated. I'd appreciate also all new tests that I can try.

  Aponikikay thank you very much for your answer.

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• Problems with encoder motor switching noise readings

  Hi all

  I wanted to ask advice with a hardware problem which seems to be pretty common.

  Here I describe my request:

  We are controlling an electric actuator for robotics application. We use encoders to take position readings, and we need to perform analog acquisition for other measures (for example, the force measured using strain gauges).

  The problem is:

  In summary, I have problems to properly acquire position readings of a linear encoders quadrature and also a few analog inputs. The cause is the switching noise generated by the drive motor that we use (which is an engine without Stricker of CC Moog BN-23-23).

  Our acquisition platform is an NI PXI-8106 with a PXI-1042 q chassis. We have two possibilities to acquire the signals. We have a multifunction DAQ series NI PXI-6259 M and a FlexRIO NI PXI-7951R with one module DIO NI PXI-6581R.

  The switching noise have a frequency of 30 kHz. In a scope, we see a series of peaks of noise which are present only during a short period of time (approximately 1/10th of the duration of the noise). The rest of the time the noise is not present.

  The Accelnet amplification module that powers the electric motor gives us a clock signal synchronized with the noise (whose frequency is approximately 1/4 frequency noise). This clock signal provides a way to solve the problem of analog acquisition. We can use this clock to make an acquisition stamped with an external clock in LabView connecting the clock on a spit of PFI or FPGA card. But the noise is also corrupt this clock signal (we get an error daqmx us warning of possible defects in the clock signal and also to stop the acquisition). I believe that to solve the problem of encoder we can also solve the problem of the analog acquisition.

  In the encoder readings noise makes our County to counter upward or backward gradually fast enough. We can get an increase in the position of about 10 cm per second with no appreciable movement in the linear actuator.

  It would be a great help if someone could put the solution he uses to solve this problem.

  Thanks in advance for your help,

  jespestana

  PS: I stress my conviction that we have a hardware problem, because we have only bad readings when the electric motor does not work. I am therefore convinced because we have already done reading encoder and analog with the help of other players, such as hydraulic cylinders. So, I think that it is not a problem with our software (of our LabView VI).

  Hi jespestana,

  I don't know why the noise could be the cause of your encoder can increase more slowly...  However I have a suggestion on the map of the M series (6259):

  M-series cards have a digital filter integrated on the lines of the PFI (see the user manual of M series).  Looks like the noise is a series of 3 ~ US of impulses (1/10 to 1/30 kHz).  Of the available filtering frequencies that you can set on your M series is 6,425 US, which must ignore the impulses (high or low) that are less than 6,425 US. You can configure the digital filtering with a property node DAQmx:

  

  One caveat is that the driver only allows you to configure the digital filtering for entries counter on M Series devices.  For example, you can use a digital filtering directly on your task of encoder, but not for your sample clock HAVE.  A workaround can be found here, which is to set up a dummy counter job to define the PFI filter for your task to HAVE.  If you use the same PFI line for your encoder and the task to HAVE it, you should be able to just set up the PFI filter through the task of the encoder and worry for the workaround.

  Regarding the RIO Flex, I think that you could implement something similar on the FPGA, but I'm probably not the best person to comment on this subject.  It would be probably a lot more work to use the DAQmx API's built-in filtering.

  Best regards

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  See you soon

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  This value is be 72, but it could be anything, because the pixel dimensions do not change.