Read a resistance of the diode by vs NI USB multimeter

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• PXI-2530 defies the laws of physics trying to quantify the resistance of the pairs of specific relay relay.

  I have a problem with a PXI-2530 switch card work in matrix mode 4 X 32. I need to determine the resistance of the pairs of specific relay within the matrix. I have a PXI-4130 and a PXI-4071 in the same chassis, so I take measures 4-wire in a configuration like this...

  

  Resistance symbols represent relays in the switch. Here is a representation of matrix-style switch routes I use. (This should look more like the interface of soft face before switch)

  

  The two diagrams represent so how I take my measure. I shorted outwardly columns C8 & C9 (shown in the first graph), I am sourcing 500 microamps of current and toggling the current source for a positive and a negative measure, I am able the voltage with the DMM. For the above measure I'm mesure.2619 ohms. This should be of course my resistance of the relay K8, K41, as well as Terminal block and wiring.

  Here's another schema. This should measure the resistance of two same...

  

  All I have changed is routing between the meter from the source. Here's the view from the matrix...

  

  With this measure I'm mesure.0873 ohms. I can have the same resistance as the first example except getting a very different measure.

  It gets even more interesting. If I had to take 4 pairs of wires, I use here, there are 16 possible configurations. I took each of these measures, and half of them gave me environ.25 ohms while the other half gave me environ.09 ohms. I tried this on a 2nd chassis and got the same result. My data are in the attached sheet. (My examples above are rows 1 & 5.)

  Taking the measure of how we are, all these measures should be substantially the same. I have a current source constant, (I even tried a crimp in instead of the 4130 and got the same result.) and the meter is high impedance.    If I had a pattern for the PXI-2530, I could do a little more analysis to know why I get various measures. Is there some diodes clamp on the lines or columns in the matrix? Something external must act solange this circuit. If I can find out what that is, I could determine my resistance to relay to a quantifiable level of uncertainty.

  Any help would be greatly appreciated.

  Greg

  It seems that I can't remove. The correct message was placed here...

  http://forums.NI.com/T5/PXI/PXI-2530-defies-the-laws-of-physics-when-trying-to-quantify-the/TD-p/122...

  Once again, my apologies for the incorrect positioning of the post.

• 9234 sensor back to resistance of the chassis

  My question is about the NI 9234 module and terminal return (HAVE) resistance to the chassis. On the side of the module, the diagram shows a 50 Ohm resistor to the chassis. However, when measured using a multimeter, the resistance is much higher (order 500 kohm.) I hope someone might be able to explain this discrepancy. My only thought is that, based on the data sheet, there are current limiting diodes present between performance and 50 Ohm resistance that may have an impact on the measurement. I don't understand how it would be possible, however. Any help is appreciated.

  Page 11 of the Manual:

  http://www.NI.com/PDF/manuals/374238c.PDF

  Watch back to back diodes in series with the 50 ohm. They are probably affecting your measure if your DMM does not exceed the voltage of conduction of them (don't know what the specs are on the diodes).

  -AK2DM

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  Hi all

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  Any other idea? Or what I have to live with it?

  Best regards
  Stefan

  Hello Stefan

  I can imagine that this problem is quite annoying for you, but otherwise, you can disconnect SD card when you have no more need. I can't imagine that it must be inserted at all times.

  I can imagine there are a few conflicts between the patches from Microsoft and Toshiba driver but such bugs should be fixed by some Toshiba updates or hotfixes Microsoft. What to say? I'm afraid at the moment that you must live with it.

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• Need help for reading in parallel on the same interface and writing XNET

  Hello. I need help to configure CAN interface to write and read from the same interface.

  I use NI PXI-8513/2. I use CAN1 as interface.

  My had TO send status messages CAN every 100ms. I have to read in order to return akntoowlege to keep DUT CAN interface happy and not make mistakes.

  So, I want to open Strim Session and readall frames in the loop. At the same time, I need to be able to write in a frame HAD at the time...

  I only need to read one picture at a time too, but since I know the ID, I can pull it from the stream.

  What I'm confusing all is how to put in place the same CAN1 interface to be able to write and read in parallel.

  I think I would get errors that interface is already in use.

  Since I'm new to CAN, I was read and write only when necessary. But, sometimes I was getting errors on my messages. Sometimes I get message, sometimes miss me. But, when I run CAN test criminal as sniffer he sends and written every time. I was told it's because it recognizes all messages.

  I opened to suggestions of how best to implement the interface.

  I guess I can use CAN2 and separator to work around this problem, but I would use an interface if possible.

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  The XNET hadrware takes care of most of the low level of detials for you. The reading and writing of the circuits are both connected to the bus at any time. When you write to the hardware it will try to put a frame on the bus at the first opportunity he can. If the frame loses arbitration material re - will attempt to send the frame up is successful. Reception equipment monitor activity on the bus, regardless of what it conveys. The material received will usually throw a framework that was sent by communication equipment, but there is an Echo property pass to circumvent this behavior too.

  Take a look at the example of the expedition: MAY-> NI - XNET-> Sessions-> multiple Sessions Intro-> CAN even exit entry framework Port unique Point.vi. Keep in mind that this example you will need to use a second CAN interface to recognize frames, it transmits. I would recoment against the example CAN output Frame Single Point which would mimic your ECU if you choose a type of cyclic frame running this example.

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  I looked on several other issues in the forum and did not find something like this. Other issues reported when related to player doesn't work do not, for example. I found a few link in some messages describing such tasks that go back to a previous version of SimplePass.

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  I made the fingerprint reader driver, rather than later.

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• VISA read lose characters beyond the end of the output string

  Hello

  I wrote a VI to take a string of output data of an ardunio Uno and analysand. I use the vi read Visa to enter the output channel of the unit. In the end I will connect a device that actually gives the value in this type of format string: (#80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,0 *).

  So after a large number of loops, the program starts to drop the last characters of the string that it generates. If the string of Visa Read output reads something like (#80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,). The only way to solve this problem, once it has occurred must completely close labview (completely). Once I open again and start the program running, all is well in the world.

  Has anyone had this problem? I tried to debug it in different ways and the only weird symptom I have other Visa Read function lose a few characters of the string is the fact that by looking at the bytes to the Port after I read visa, is that she starts showing five bytes instead of zero.

  my last attempt at resolving this issue is attached.

  Note: The Ardunio outputs a string of this format every 2 seconds with the values being incrimental on a specified range. (80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,0 # *)

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• VISA do not read serial data in the right order

  Hi all

  I'm working on a project, when I need sample data at point A, it passes these (zigbee) wireless data to point B and here rs232 connection to the laptop.

  I'm using labview 2011 to view sampled data, but I have a little problem, data are not entered into labview in the right order and this is quite crucial in my application. I have attached some photos and my vi to describe the problem in detail.

  Data are packaged in the following form: AS:number1:number2:...:number49:\r - where is the beginning, followed by the values of the sample character separated by: and the last is followed by a return at the end of the cart package.

  When I view the data in different terminals (PuTTY, tera term ect.) then the data is in the correct order.

  To make the most obvious problem, I place the sampling to count an integer of 16-bit instead of the real samling

  The png sample of teraterm is how it is supposed to look like. The vi_sample.png is the string of labview, which is false, I've highlighted a few errors in the visample. When using the VI, I noticed that all the data is collected, but not in the right order.

  The missing Subvi is a few small VI that reads the input rs232 string and control the various indicators of this.

  I hope that you are able to help me with my problem.

  Concerning

  Tommy

  In the structure of case where read you the serial port you are adding at the beginning of the string rather than allow the addition. In other words, you build the answer backwards.

  Your method of reading is contradictory. You have configured the VISA session to stop playing when he sees a carriage return, but you do not actually. You have configured it so tell some bytes are on the serial port. Maybe it's not the set of bytes, since you have no delay between writing and reading, so you can be is only half of the message. If you use the method of termination, then reading VISA should have great value wired to the bytes to be read. Then, when VISA Read see the stop character, it will stop automatically. If you use the bytes available, then you need a mini loop to keep reading until you see the end of the response. Choose one or the other - don't try to play both ways.

• TCP Read and Write at the same time

  Hello everyone,

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  I know that it is possible to read and write on the same connection ID.

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  Or to request more precise if I run two while loops, in parallel, with one end by calling WriteTCP and the other called ReadTCP.

  one of the delay of loops (or block) will be the other if both loops call their VI TCP at the same time right?

  The system is Windows 7 and Labview 2012.

  Kind regards

  Sebastian

  They are perfectly parallel.  Just write in one and read it from the other.  There is no conflict.

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• Why can't acquire data from strain and resistance at the same time with a NI 9219 module?

  Hello

  I use a chassis with a NI9219 module 9172 cDAQ to try to acquire the strain and resistance at the same time, with the Labview SignalExpress software.  Is this possible?  When I try to display two values of signal at the same time, I get an error of assistant DAQ 50103 'the specified resource is reserved.  The operation could not be performed as indicated.  I used to be able to acquire the strain and tension at the same time, but now even that gives me error 50103.  I have hours trying to figure this out.  Any help would be greatly appreciated.

  Thank you

  Justin

  That's all!  Thank you very much, now I can sleep tonight - seriously!

  Thanks again,

  Justin