In Keithley 2410, string number read voltage conversion

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• How can I define a current source and measure voltage at given intervals of time using GPIB on a Keithley 2410 (LabView 7.1)?

  Hello

  I use an old version of LabView 7.1 and a Keithley 2410 communicate via GPIB.

  I want to do a simple program, sending a commando to the 2410 to source a current given, without interruption.

  Then in the light of time intervals, I want to read the current tension for logging in a txt file. My idea is to do this

  simply by sending orders to the Keithley 2410 stations. Could someone please give me a hint in the right

  direction to do?

  I'm not very good at LabView, but have done some simple programs using USB - DAQ before.

  Any help is appreciated.

  --

  Lars

  Thanks again for your help,

  I understood that the reason why I did not have all the data (and that the 2410 a frozen/hung) was that in vi GPIB READ, I did not specify the number of bytes to be read, and it didn't have a default value.

  After adding a constant to this entry, everything worked like a charm.

  Thank you for your recommendation on the * CLS command.

  --

  Lars

• voltage conversion by current in daq reading

  Hi all

  I have a pressure sensor which gives my daq output.my is read voltage.i connect the resistor as parallel analog input. But I can not yet read voltage.when I check with the ammeter to the current value is correct, but it can't convert it the voltage.

  BNC connection can carry it HAVE (-) the outside contact.  So, I (-) should be the round metal cylinder on the DAQ hardware.

• Help. Temp for voltage conversion.

  I'm currently trying to find a best way to calibrate the thermocouple read outs. I would like to be able to enter any temp for all TC and labView output the corresponding voltage. So I was hoping someone would have a way to make this temp for voltage conversion. Example if I want to do 250 C I need 10.153 mV how labView could be made to calculate this.

  This will allow you to enter the temperature you want for the simulation and corresponding voltage.

• Number returned to voltage conversion

  I am writing an app to acquire data using PCI cards in VB.net with VS2010. I "assumed" that for a 16-bit card was 65536 heads available for the used range (09:50, etc.). Experience that has not been corroborated. In theory, using the above values, 10 volts volts equal to 32768 and - 10 would equal-32767. I constantly receive lower values.

  Can someone tell me if this is correct: there is a 16 bit, 65536 counties map covering the entire map (INCLUDING OVER VOLTAGE RANGE)? In other words, I need 10 volts of input, take this indictment and then entry-10 volts and that would determine my range of work of the charges?

  Hey Dan,

  If these values are not too crazy about what I expected (not much either).

  I guess that it is more a function of calibration and absolute precision.

  I would check page 4 and 5 of the technical manual for the 6220:

  <>http://www.NI.com/PDF/manuals/375200b.PDF >

  It details the absolute precision, given a number of factors that could explain your results.

  Also the installation of the samples, you must specifically include in your installation of data acquisition:

  <>http://digital.NI.com/public.nsf/allkb/0EA34D565632DFE186256E7B00762DCC >

  and then they can be found in the following locations:

  <>http://zone.NI.com/reference/en-XX/help/370473H-01/mstudiowebhelp/HTML/locateexamples2010/#netxp >

  I hope this helps!

• missing the conversion of string number of digits

  I have a quite unusual problem and cannot find any solution. The problem is the sequel.

  I get a multimeter string action, and it looks like this: '3.7260900E + 00. Then, I want to put this number on a waveform graph, and I need to convert them to numbers. Regardless of the VI to convert I use, everyone returns only the first digit in this case: '3 '.

  What should I do to get the complete number on the chart? I already tried to use more digits in the properties of the graph, but this has no effect.

  Thanks for help.

  Hello Marlon.

  You probably use a PC with the locale 'German', that is by using the comma as decimal separator. So, you should try this:

  

  The format code "%."; defines the point to be used as the decimal separator, however for your locale.

  This is the reason why I put all measurement systems using the English locale (atleast swap settings German point/comma).

  BTW. increasing the accuracy of the map does not change data related to it

• hardware error Keithley 2410

  Hey, guys.
  I am very new in this LabVIEW, do some programs still use drivers to control instruments. So, recently, I work to control a Keithley SMU 2410. I make a simple program to constant voltage source and measure the current vs time. This program works wells in short periods and Keithley functions very well. But last week, I used for 20 hours, the problem was that 45 minutes of operation, the front screen of EMS unit exploded, the labview show an IO error that can communicate with the instrument, and when I reboot the instrument, he can't do anything, and the labview is not able to communicate with the instrument. The device is made when works as a source unit and can not be damaged by high currents, and therefore the last measures was about 100 my when the level of compliance was at 1. When I turn on the camera, I only hear the fans and I can't do nothing, I look for the fuse but it was ok.

  So I know that it is a hardware error Keithley not associated with NOR. But I got the idea that maybe something that I put in my program to damage the instrument in a certain way. I master the instrument with a serial cable, and I used the drivers I downloaded from a page of NOR, don't remember which version was. Just need help to see if it's a bad thing that I do, damaged the instrument

  Greetings to all.

  Although there are a few bad choice of programming in this code, is nothing that should have caused injury to the Kiethley in code.  Something in the material should be suspected.

• How to read voltage on several channels using the 6255\SCB-68

  Hi all

  I have been able to get the following code to compile, run and display the data as expected. When you read the tension (CSR) on Dev0/ai65

  ... Instruments\NI-national DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Cont Acq - Int Clk\ContAcq - IntClk.c

  * I think I'm using CSR, but I have no idea since I don't see an argument to specify

  I'm reading two different data points:

  1 discovered (CSR) tension on Dev0/ai65

  2 show the (differential) voltage difference between Dev0/ai17 and Dev0/ai25

  Can someone point me to an example (or a web link) where two different data points are read.

  * edit - I am filling this task using C++

  Thank you

  Chad

  This code is a start, and it works

  
  
  using namespace std;
  
  
  
  
  
  
  
  
  
  using namespace std;
  
  #define DAQmxErrChk (functionCall) if (DAQmxFailed (error = (functionCall))) goto error; on the other
  int main (void)
  
  {
  <>
  
  	< "\t="" starting="" the="" ni="" daqmx="" data="">
  
  	<>
  int loop;
  < 3;="">
  
  	{
  
  		Int32       = 0 error;
  
  		TaskHandle  taskHandle1 = 0;
  
  		TaskHandle  taskHandle2 = 0;
  
  		Int32       read1.
  
  		Int32       Read 2;
  
  		float64     data1 [1000];
  
  		float64     data2 [1000];
  
  		tank        errBuff [2048] = {'\0'};
  Channel settings and the schedule of the analog voltage DAQmx
  
  		DAQmxErrChk (DAQmxCreateTask ("task1", & taskHandle1));
  
  		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle1, "ai25/Dev1", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));
  
  		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle1, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
  DAQmxErrChk (DAQmxCreateTask ("task2", & taskHandle2));
  
  		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle2, "Dev1/ai17", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));
  
  		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle2, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
  Starting code DAQmx
  
  		DAQmxErrChk (DAQmxStartTask (taskHandle1));
  Reading DAQmx code
  
  		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle1, 1000, 10.0, DAQmx_Val_GroupByChannel, data1, 1000, & read1, NULL));
  
  		< read1;="">
  
  			< data1[i]="">< "="">
  
  		<>
  DAQmxStopTask (taskHandle1);
  
  		DAQmxClearTask (taskHandle1);
  Starting code DAQmx
  
  		DAQmxErrChk (DAQmxStartTask (taskHandle2));
  Reading DAQmx code
  
  		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle2, 1000, 10.0, DAQmx_Val_GroupByChannel, data2, 1000, & read2, NULL));
  
  		< read2;="">
  
  			< data2[i]="">< "="">
  
  		<>
  
  		DAQmxStopTask (taskHandle2);
  
  		DAQmxClearTask (taskHandle2);
  Stop and clear spots
  
  	Error:
  
  		If (DAQmxFailed (error))
  
  			DAQmxGetExtendedErrorInfo (errBuff, 2048);
  
  		If (taskHandle1! = 0)  {}
  
  			DAQmxStopTask (taskHandle1);
  
  			DAQmxStopTask (taskHandle2);
  
  			DAQmxClearTask (taskHandle1);
  
  			DAQmxClearTask (taskHandle2);
  
  		}
  If (DAQmxFailed (error))
  
  			printf ("DAQmx error: %s\n", errBuff);
  }
  
  	end of loop
  <>
  
  	< "\t="" stopping="" the="" ni="" daqmx="" data="">
  
  	<>
  return 0;
  }

• check the string number

  Hello

  In my application, TestStand receives a response from a DLL I give the floor. This DLL can return either a numeric value (casting in a string), as "120" or some sunk in a text string, as a "MISTAKE." I would like to make the test step fails, if the return string is NOT a number.

  Someone at - it a clues on how to do it? I tried something like an IsNumeric function, but couldn't find one.

  Jeroen

  Hello

  You can use the Val (string, ) function in an expression to convert your value chain. Check using this function.

• Voltage conversion for the Module e/s-OR-5751

  The only place where I can see an example of this is the example 'NOR 5751 finished several acquisition channels'.  The conversion to the VI is illustrated below:

  

  It is a 14-bit digitizer, so I'm not the "16" for the resolution.

  The text in the example says: "data from the 14-bit a/d converters are represented in the CLIP as compliment of 2, MSB justified, I16.". 2 LSBs are filled with zeros. The data are multiplied by a scale factor (ADC voltage resolution = voltage range / ADC * 16 intervals) to LSB justified data and scale to volts. "This seems to be different from the code above.

  I don't understand what is the factor of 16 text. Or I do not understand how they are the same.

  Hey JP82,

  The 5751 is one of our familiarization trips that produces data MSB justified, with even two most (LSB) containing 0.

  If you changed the generetaed of data by the fam to the right by two, then you must use 14 bits resolution.

  Example of MSB justified:

  Input voltage: 1V
  Binary representation of FAM: 0111111111111100

  Sign bit ^ zero of the LSB ^ ^

  Decimal Rep: 32764

  MATH:

  2 / (2 ^16 - 1) * 32764 =

  3.05E - 5 * 32764 = 0.999302 ~ 1V

  If he was justified in LSB:

  Input voltage: 1V
  Binary representation of FAM: 0001111111111111

  Sign bit. ^

  Decimal Rep: 8191

  MATH:

  2 / (2 ^14 - 1) * 8 191 =

  1.22E - 4 * 8191 = 0.99993 ~ 1V

  I do not believe that data are two is completed, as indicated in the details.  I'll see that this gets fixed.

• Using DAQ Assistant to read voltage of 9205

  I am new Nock in it and I tried to read the voltage level of 9205 relating to 9172. I use it in XP mode virtual because windows 7 does not have labview 8,9. I installed the drivers for data acquisition.

  When I check the meter in automation and Explorer, it works very well which means it reads im DC voltage supply. When I created a VI facilitate data acquisition, I chose the right channel, the entry as analog voltage, the numeirc indicator shows it is-10 to 10. I noticed he did the same thing, even once the USB is disconnected, which means that the function helps daq was not save the data of the 9205.

  Can someone help me?

  Hi aaclabview,

  The way in which you have added the device to MAX makes the device act as a simulated instrument. Simulated instruments only generate sine wave data to test a piece of code without using any material. A simulated device has the icon yellow as shown in the screenshot you provided and are completely dissociated from any material, so add or remove the usb device has no effect.

  The problem with the help of Windows XP mode as mentioned in the above KB is the USB transfer must be enabled for the measurement and Automation Explorer inside the Virtual Machine detect the device. Using the unit in this way is not supported or recommended by National Instruments and can lead to instability and the latency of the errors in the acquisition of data even if a connection is established.

  It is a more sure bet to try and install LabVIEW and hardware drivers DAQ as described above on the real Windows 7 machine to try and run inside the XP mode.

• Registration number read only fields of alignment

  APEX 4.0.2 / RDBMS 11G R2

  I would like, in a form of the APEX, aligned to the right a read only numeric value which is calculated by my application.  According to the doc of the APEX, this feature is not available under number of alignment "does not apply to read only fields and the fields where the element HTML Form attributes are specified.

  Does anyone know of a workaround for this problem?  Ideas, suggestions and/or recommendations are welcomed and appreciated.

  Thanks in advance,

  John S

  Hi John,.

  You can try adding some css yourself:

  Add a class to your form field in the Form Element Classes fields HTML CSS attribute and add a property text - align for this class in your css file, or in the header html region.

  For example, put 'rightAlignField' in the attribute of the form element to HTML CSS Classes and add

  to the header html form regions.

  Kind regards

  Vincent

• The string number fails when letter after the number?

  kind of confused I hope someone can answer this question. I have a function to verify that a string is a number as such.

  
  
  
  isNaN(parseInt(num));
  
  
  
  return !isNaN(parseInt(num));}
  
  
  Public function isNumeric(num:String):Boolean             { 
  

  
  so, if a shipment in the 'aa' value, it returns false. Great! However, if I send '1a', it returns true. However, it is not a number? can anyone offer suggestions. I ti I test more away this by looking at what value the function it's after I have send value "1a" and he thinks that the value is '1', so I guess my only other option to stop this would be to move the channel to a table and to loop through the entire string looking for non-numeric values? what I do?

  Miguel

  Maybe try to use instead of parseInt number?

  public void isNumeric(num:String):Boolean {}

  return! isNaN (Number (num));

  }

• Blank page has no page number after the conversion of Pages 4.3 to 5.6

  I have a big document v4.3 Pages ' 09 running on a Mac in the Mavericks. I sent a copy to another Mac running El Capitan and opened it in Pages 5.6.1. After correcting some formatting issues I just on a blank page at the beginning of a section, and the new version Pages does not count this page then the next page is numbered one less it should. I need to have counted blank pages for the odd number pages are located on the right side of the book. How can I fix it?

  Pages 5.6.1 does not have facing Pages, there is no page on the right and left.

  Continue to use Pages ' 09. There is not much to be gained by using the Pages 5.6.1 and a lot to lose.

  Peter

• VISA data serial number read

  Hello

  I'm starting to Labview (after a few years) and I have a problem with a reading series basic (using VISA) program.  The code is attached, and my problem is that I'm getting out of "FE FE FE", when I see in the Putty terminal it is count up to integers indefinitely - I can't quite grasp what's going wrong here (after much trial and error), so any help would be appreciated.

  Thank you

  Rob

  First thing to do is to use the configure Serial Port instead of the VISA opening and make sure that your serial port settings are current.