Problem of noise with signal analog mV

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• New Dell Inspiron 1764: Problems with signal low connection to wireless networks.

  I have a new laptop Dell Inspiron 1764 I received on 25 June. It is "replace" a Dell Inspiron 9100, who has learned to be too slow and too bulky for my needs. For the purposes of support, the two laptops are running on Windows 7.

  Overall, I love my new Inspiron 1764. However, I noticed the connection/signal strength seriously degraded, with wireless (Dell Wireless 1397 WLAN Mini card) card, compared to my Inspiron 9100 (Dell Wireless 1350 WLAN Mini-PCI card).

  In areas of my home that my 9100 can obtain the power of the complete signal (5 bars), my new 1764 bars 2 or less. This behavior is not as limited to only my house as I have tested in my work and in an area of less than 10 feet away from the wireless router, I have 'Internet connectivity problems.

  I tried twice this morning talk with Dell technical support. The first person I talked to tried to be helpful and initiated at least a DellConnect session with me so that he can check out some of my settings and such (However, why they went twice in my sharing settings I could not determine as they have absolutely nothing to do with the intensity of the signal).

  Unfortunately, I was disconnected from the session when I went to a place that had less signal than just next to my wireless router.

  I then go on the chat support with Dell and received another technician to speak with. I explained my problem, told them that I was in a DellConnect session with the other technician, and they looked to the top of my support contract.

  They then told me that my warranty does not cover software issues and referred me to the software Department and said it would be a supplement. I told them that I did not believe that it is a problem of software in any way, shape, or form. They told me that it must be a matter of adjustment. I spent several hours scouring the internet forums on Dell and other sites check those who have had similar problems. Some of their questions were certainly the software settings, but I still don't yet to find anything that tells me I have an incorrect setting of software.

  So far, I'm standing in my kitchen, tapping on my Inspiron 9100 with a full 5 bars, while my Inspiron 1764 is sitting next to me with a skinny 2 bars, and I am literally standing 7 feet above the room which houses my Linksys WRTU54G-TM router.

  Personally, I suspect a faulty wireless card, but how to convince Dell to hear my case and replace it instead of trying to bilk me for support of useless software?

  I hope Dell Tech Support bed actually this post, or people with the same problem can Dell refer to my previous post describing the problem and the fix.

  It IS a PROBLEM of MATERIAL WITH the ANTENNA, AND VERY PROBABLY THE DIFFERENCE BETWEEN a DECK CONNECTION at the ANTENNA of the PLATE, from connections TAPE FOIL INDIVIDUAL at the ANTENNA of the PLATE, THAT DELL MUST HAVE RESPONSE BETWEEN WHAT MINE PORTABLE has BEEN CARRIED OUT AND THE SPARE ROOM WAS MADE. THE PROBLEM IS NOT SOFTWARE, PROVIDER OR ROUTER, IT IS THE PLASTIC WITH THE ANTENNA CASE!

  Dell is in fact losing more money with the hours of technical support through software patches and sending technicians with new wireless cards that does not solve the problem. They need to send and replace the plastic case behind the LCD screen with the updating of antenna and connections.

  Good luck!

• Synchronization of two inputs frequency meter with several analog inputs

  Hi all

  I'm relatively new to LabVIEW and I'm trying to collect data from multiple sources with calendar sync on the acquisition, but I can't understand. My problem is that I have two inputs frequency meter, an optical tachometer reading one pulse per revolution and a max flow meter machines with a 12000 k coefficient. I can't find a way to synchronize the calendar with my multiple analog inputs. I tried to first get the speedometer to synchronize with the analog inputs following the example linked here. (https://decibel.ni.com/content/docs/DOC-10785) So far every time I run it I get an error on the DAQmx read timeout or an error "several sample clock pulses have been detected" (see image).  It seems if I slow the way to down to say 10 hz and make sampling rate ensure that the tachometer signal is more than 800-1000 rpm (13-17 Hz) before starting the VI then the program will run without error until the ROTATION speed is below this threshold, then the "sample Multiple clock pulses" error occurs.  The code is attached below.

  Does anyone know of a better way to synchronize the entries of frequency of the counter with analog inputs?  I would like to have a VI that can display 0 RPM (and possibly 0 flow as well, but I think I need to understand the timing of a meter before I have add another, because it seems that I can't have two counters to the same task). Any help on this would be greatly appreciated.

  LabVIEW version 13.0

  Chassis cDAQ-9178 with NI 9401 for both counter inputs and NI 9205 for the analog inputs.

  Thank you!

  Richard

  I know the error requires to restart the task at least (this particular error puts the material in a State that cannot be recovered from during execution of the task - I've been down this road before) but I'm surprised that you would have to delete and re-create the task altogether.  And then I had to do this to workaround other questions in the past.  It is awkward and should be considered a bug, if this is indeed the behavior.

  Honestly, regardless of this bug, the way the material dealing with the situation of several sample clock edges makes measures of sampling frequency clocked essentially unusable for purposes of synchronization (in my opinion anyway) If you encounter a more slow than your sample clock rate.  You are supposed to be "synchronization" of the measure, but it really no longer applies if you have to restart the task over and over again (if you must delete it or not).

  Workarounds can get kind of creation (which isn't really a good thing).  For example, you can configure a measure of implicit frequency to keep a buffer of frequencies and use a leader board task (source is the frequency signal, sample clock is the sample clock HAVE) to establish a correlation between the index of your buffer of frequency for singing HAVE sample clock.

  Best regards

• problems syncing multifunction with PCI-6229

  Hi, I use PCI-6229 and LabVIEW 8.0 for synchronized of the thermocouples and voltage measurements. The diagram is attached here. Here are my questions:

  (1) with the analog inputs of TC is ranked very first and followed with inputs analog voltage, as shown in the diagram, it works fine. But once the tension AIs are placed first and followed with AIs for thermocouples, thermocouple reading makes no sense, for example telling 25 deg C, the program shows strong fluctuating temperature 10-80 deg C.

  (2) the delay time using DAQmx Trigger, here I put the Start.Delay = 2, Start.DelayUnits = ticks. And sampling rate = 1000 Hz for sample clock VI. Then, is equal to 2 X (1/1000 second) delay time = 2ms? If no deadline is set, which is the time between the trigger signal and actural reading? Will it be the time device resolution 50 ns?

  All entries would be very appreciated.

  

  Hi Matt11,

  (1) the order that you specify strings in your task will affect the order of scanning.  In other words, when you add the channels voltage before channels of temperature, the material can enjoy the tension or s channels followed by the string (s) temperature.  Since the 6229 is multiplexed, it comes to each channel sequentially switching in a single ADC.  In your case, it seems that the tension on the ADC to measure voltage not had time to resolve completely prior to taking the measure of temperature.  We refer to this sometimes as ghosts in extreme cases where the value measured on channel b mimics the tension on the channel.

  I think that you have found that you can get this by adding the TC task first.  You could probably also get the same result by allowing more break-in between channels on your scan list.  You can set the time between the channels with a Timing DAQmx property node (you can set the property is the clock frequency convert, which is the opposite of a waiting time).  For slow sampling rates, sets DAQmx convert a default clock rate up to a minimum of 1/14 US (on the x 622).  If your overall sample rate is less than 1/14 us (about 71 kHz) then you should have room to lower the clock rate to convert more of this if you wish to allow more time to settle between the channels.

  I'm a little surprised that you see errors because of it (generally, the problem comes from a signal source of high imepdance measure or when sampling at higher rates), but then again, the temperature measurement would be very sensitive to small voltage fluctuations since you deal with thermocouple voltages at room temperature.  Given the order of scanning affects your measure the problem is almost certainly introduced leaving not enough time for the ADC to settle after reading your string tension.

  (2) ticks means actually timebase tick rather than the graduations to sample.  The minimum is always 2, but this match 2 graduations of 20 MHz (100 ns) time base from which the sample clock (unless you choose otherwise or specify a sampling rate less than 20 MHz / 2 ^ 32), instead of 2 graduations of the 1 kHz sample clock (2 ms).  In fact the trigger is probably performed asynchronously at the base of your time, if you are anywhere between the graduations of 1-2 the basis of delay time (50-100 ns) according to the relative phase of the trigger to the time base.  If no time limit is set, the default value according to me is still 2 ticks which is the minimum that allows hardware (you can check on your own by reading the property node if you wish).

  These points should be compatible between different driver versions, with the exception that DAQmx chose by default convert rate differently in earlier versions of 7.4.  Select the conversion rate is a compromise between the settling of deadlines and the channels are sampled how "simultaneously" on the MULTIPLEXED Board.  The final result in point 7.4 of DAQmx was a compromise apparently arbitrary add 10 US for the minimum conversion period and use this as the maximum by default between the channels.  The user can of course always set the clock to convert to all what best fits their application (in your case, you might want to allow a settlement more between each channel).

  Best regards

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