Measure the voltage and the temperature simultaneously with PCI-6281

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• Acquire simultaneously with PCIe-6535

  Hello

  -J' use a PCIe-6535 to manage an electronic home-made (working) card. The electronic card has a FIFO used to store data.
  I need to read that data during the acquisition, and the moment for playback is defined by a product a DDS signal that
  I have to read too. I'm programming with CVILabwindow version 10.0.0.

  In the software "processes", I start the DDS, and I expect a signal(or event) I detect it with the next part of the code (thread0):

  DAQmxCreateTask("",&line_Clk_TaskHandle);
  DAQmxCreateDIChan (line_Clk_TaskHandle, "port2line3/Dev1", "", DAQmx_Val_ChanPerLine);
  DAQmxCfgChangeDetectionTiming (line_Clk_TaskHandle, "Dev1/port2/line3", "line3/port2/Dev1", DAQmx_Val_ContSamps, 1); I perceive the event UP and DOWN and up and down.
  DAQmxRegisterSignalEvent(line_Clk_TaskHandle,DAQmx_Val_ChangeDetectionEvent,0,ChangeDetectionDD3,);
  DAQmxGetTaskAttribute (line_Clk_TaskHandle, DAQmx_Task_NumChans, & line_NumLines);

  ChangeDetectionDD3 is a function that started with the acquisition of FIFO.
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  DAQmxErrChk (DAQmxCreateTask("",&taskRead));
  DAQmxErrChk (DAQmxCreateDIChan (taskRead, ' Dev1/port0","Digitalin", DAQmx_Val_ChanForAllLines));
  DAQmxErrChk (DAQmxCfgSampClkTiming (taskRead, "OnboardClock", 5000000, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, NUM_SAMP));
  DAQmxErrChk (DAQmxExportSignal (taskRead, DAQmx_Val_SampleClock, "/ Dev1/PFI5"));
  DAQmxSetTimingAttribute (taskRead, DAQmx_SampQuant_SampMode, DAQmx_Val_FiniteSamps);

  SYSEn [0] = 0;          ALLOWING the acquisition chain
  RES = DAQmxWriteDigitalLines (Task_SYSENn_Handle, 1, 1, 10.0, DAQmx_Val_GroupByChannel, SYSEn, NULL, NULL);
              
  R4T [0] = 0;          ALLOWING playback of the FIFO
  RES = DAQmxWriteDigitalLines (Task_FIFO_R4T_Handle, 1, 1, 10.0, DAQmx_Val_GroupByChannel, R4T, NULL, NULL);
  READ FIFO
  RES = DAQmxReadDigitalU8 (taskRead, NUM_SAMP, 10.0, DAQmx_Val_GroupByChannel, ftell, NUM_SAMP, & sampsPerChanRead, NULL);
              
  R4T [0] = 1;          STOP reading
  RES = DAQmxWriteDigitalLines (Task_FIFO_R4T_Handle, 1, 1, 10.0, DAQmx_Val_GroupByChannel, R4T, NULL, NULL);

  Since I have to read more than one set of data, I get in this part of the code several times (each time DDS AD9910 send a change on the RAMP_SWP_OVER of two-way continuous line signal ramp Mode RAM, in the case).

  -The problem I get is due to a resource that is already in use"when I read the FIFO through DAQmxReadDigitalU8.
  In particular:
  RUNTIME ERROR NO MORTAL: "Read_FIFO_Thread.c", line 44, col 23, 0x000014C8, int id thread id 1: function DAQmxReadDigitalU8: (is-200022 return value [0xfffcf2aa]). Resource requested by this task has already been reserved by another task. Feature: Dev1 task name: the State _unnamedTask<134> Code:-200022

  I've already simplified to the limits of the code, and I get this ERROR only when I read that both inputs line. When I run the code for a signal acquisition
  only the code works and I have read the FIFO or I read each shipment of the event by the DDS on port2/line3. I thought the problem resides on
  the countdown on the PCIe (which may not be apart as I want: port0 and port2/line3) implicitly used by functions
  dedicated to the detection of the event generated by the DDS.
  I guess the first question is: can I use the Onboard clock in this configuration?
  and if I can use how do I manage it? I mean, what do I have to configure?

  Carlo

  
  

• Measurement of temperature using Iex thermistor with PCI-6259

  Hi all

  I have I encounter some difficulties to measure the temperature using MAX with the installation of the thermistor Iex and would like to know if I missed something important. I use external current thermistor excited with 2 ladders and card PCI-6259 with MAX.

  This is a channel that was originally set to measure voltage and MAX approx. 900mV since this channel, OK, the voltage converted temperature is about 30 ° C. Then I added a new channel and configured to measure the temperature directly with default installation MAX Iex thermistor. This is so the problem appears: I'll get a constant-273 C instead of 30 C as expected by operating the canal in MAX. I must have done something wrong here.

  Your help is greatly appreciated!

  Bryan

  We discovered that the problem came from our wiring to thermistor does NOT of installation. If Differencial has been used, the conversion of MAX worked well. If this is not the case, only directly blood pressure will work.  Bryan

• The REPORT CYCLIQUE with myDAQ measure?

  Hi all

  Sorry for my beginner question. Is it possible to measure the duty cycle with myDAQ? If Yes, could you give me some advice please how? I want to measure the temperature with temperature probe SMT 160-30 with duty cycle output.  I tried the analog and digital inputs. In the case of the analog input, there is a problem with zero amplitude (error). If I use entry digital then output is 0 and Boolean variable 1 and I don't know how to proceed with the determination of the duty cycle. I use DAQ assistant so I will gratefull for the solution with the DAQ assistant.

  Thank you very much

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  What you need to do, is to capture a waveform analog (PWM signal).  Then you perform a comparison on all data entered to see if it is greater than a threshold.  A typical threshold for a 5V signal is 2.5V.  That should translate into an array of Boolean.  Use then Boolean (0.1) followed by the average.  If you want a percentage, multiply by 100.

• measure the temprature of thermistor using 6225

  Hello

  I'm using LabVIEW 8.6/DAQmx with a DAQ card 6225 of series M, connected to a terminal block of CB_68LPR.  I want to measure the temperature of a thermistor.

  First of all, I connect the two wires of the thermistor to AI6 (J25) and HAVE GND (J24) because I assigned AI0 to Ai5 to six voltage signals.

  When I tried the example of temperature measurement, if I set up the channel as "2-Wire thermistor Iex" ai6 and choose the internal excitation source, I got the error message "measurements: device to which is attached the sensor was not a source of excitation internal avaible. But the requirement for this example indicates that the PXI-6225 can run the example. So here are my questions: is not my connection reflectometers to the terminal block? Which device should provide the excitation source, the map DAQ or other Terminal, if I really want to choose internal source?

  Then I tried to use DAQ Assistant to configure the channel as "Vex 2-Wire thermistor" ai6, I received the error message "measurements: configuration 2 son resistance is not compatible with the excitement of tension", no matter if I choose 'Internal' or external"source of excitement." But in general configuration 2 son is good for thermistor. So my thermistor is not the type thermistor Vex? So, what type of thermistor is Vex thermistor? The technical details of my probe says nothing if it is Vex or type Iex.

  Thanks in advance,

  Caizhen

  Hello Caizhen

  PCI-6225 doesnot have an internal excitation source, but you can use one of the AO as an excitation lines if you have not the external voltage source, in this case, you should always configure your task as external excitation and measures four sons and in the program, you can take care of task AO where you can specify what exciatation you need. The measure of two sons is not supported in Vex-thermistor task. The connection diagram is shown in Measurement & Automation Explorer (MAX) in your task DAQmx.

  Another possibility is to you can measure the resistance of the thermistor and map it to the temperature at two scales, but you will still need to have the excitement of current external OR-6225 has not built in power source, which is what he does in the task of Iex-thermistor.

  Keep us informed on updates.

  Thank you

  nAyer