Correct configuration for a measurement of voltage of 5 signals of pressure 4-20mA with a common GROUND (see photo)

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  I'm not familiar with the reference electrodes, but I think I'd go with a differential configuration for your application because of the length of the cable (I'm guessing 2x50m or more?). Here is a tutorial about voltage measures: http://zone.ni.com/devzone/cda/tut/p/id/7113 I hope that you will find some ideas on it.

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  Assuming that the DAQ cards can handle it, you can set an analog trigger for the channel of the tension.  Then you just X samples to get your 100us data value.  Keep the last sample.

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  Hi, Harry, it's Paul with engineering Applications to the OR.

  My first question is why you are wanting to physically measure the voltage?

  If you are wondering how that tension may vary, it is limited by the maximum capacity of 150mW of your device, as explained here: http://digital.ni.com/public.nsf/allkb/7CBC67482CC9FB318625758C0048FF73?OpenDocument

  If you want to continue to measure externally, you have a few options.  You can use another DAQ hardware to measure the voltage, or you can use another external device, like a digital multimeter.

  If you want to see in the excitement that is actually supplied LabVIEW code, you can use the node property DAQmx 'Value of real excitement'.

  As far as playback of multiple channels, theres two ways you can go about it.  If your channels are sequential and all have the same settings, then you can change your name of the physical channel to something like 'Dev1/ai0' to ' Dev1 / ai0:3: to specify the first 4 channels.»  Alternatively, if you wanted to select non sequential channels, you can chain create channel set tasks, as long as they are of the same type of task (AI voltage, etc.) and the same device, as shown below.

  

  Let us know if you have any other questions.

  Kind regards

  Paul

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  In fact, the calendar should not have anything to do with the edges being detected.  Configuration of a sample clock for a county of just edge task allows you to enjoy deterministically in the account register and has no impact on the edges which can be counted.  Also, the analog examples really have nothing to do with what you seem to be asking questions on.

  ... So it leaves the question unanswered as to why you might miss the edges.  Perhaps the following information could shed some light on the question:

  1. it is possible that you do not configure the counter exactly as you think you are.  Can you post the VI you use?  As a point of reference, count digital events shipping example does not use any clock sample timing and just questioned the value of the register count with a software loop, but the meter should not miss all this edge on the input source.  There are examples that are timed by the material available as well, but this is not necessary, unless you need a constant specified dt between your counter samples.  To use the examples of the timed sample, you will need to generate a clock of either another subsystem on the map or use an external clock.

  2. assuming that the configuration of the counter is not the issue, there may be a problem with the method that you use to determine if you are away from the edges.  How do you know that you are away from the edges?  The function generator produces only a finite pulse amount?  You start the meter before start out impulses?

  3. If the two points above do not raise red flags, it seems likely that the meter is registered just not some of the impulses of your FGEN.  Can I assume that the output of the FGEN is 0 - 5V TTL?  What is its frequency and duty cycle?  The maximum external source for the meter on the M-series products: DAQ (like the 6259) is specced at 20 MHz, but this depends on a clean signal with good connections.  At frequencies above it, the bandwidth of the front-end of the PFI lines becomes limiting.  If you have an available specification document for your FGEN I'd like to be able to see it.

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  Best regards

• Common ground for a precise measurement and analysis

  Hi all

  I wanted your opinion on input and analog output configurations. Connect us two resistors in series and provide an output signal analogue sine through it 10 V. Then, we measure the potential across the two resistors using differential input configurations, on the channels 0 and 1 AI. What I am curious about it is:

  (1) do we connect the ground of the analog output and analog input mass together?

  (2) if they are interconnected, so am I right in saying that the two potentials measured on the differentialchannel are referenced to a common ground?

  (3) that help to improve SNR?

  Will be grateful for your responses. (Two resistances here are an example of simulating loads through which am measure potential).

  see you soon,

  As mentioned, usually GND terminals are connected internally, so there is no real need for an additional connection between the GND AI and AO GND Terminal.

  If you connect to them outwardly there is risk of creating a "ground loop", i.e. a closed circuit which cover a certain area that can capture the sounds of the environment. "Double earthing" should generally be avoided. However, perhaps in your configuration you will not see a noticeable difference with or without external connection - but it is evidence that the theory is wrong.