Generation of voltage ramp

Similar Questions

• How to make a voltage ramp

  Hi all I am a beginner on LabView and have written a program to generate the next ramp below. Using the graph, it seems to work, however when I plug a scope or a voltmeter to the map, I see no output. Why?

  Riclambo-

  You will not be able to see anything in the scope because you run the program once.

  To allow you to see something when you plug a voltimeter on your Board, you will need to place a while loop.

  Since you are a beginner to LabVIEW I suggest using the screw Express (in this case a DAQ assistant output). In this way, you can configure your data acquisition for output on a specific channel of the Board you are using.  Don't forget to select continuous samples, otherwise you will be not able to see anything when you connect or scope or voltimeter.

  If you want to leave the service with the same appearance as the one you sent, right-click on the Express VI and select "generate the DAQmx Code."

  Hope this helps

  Best regards

• Generation of voltage USB-6501

  Hi all

  I am very new to the use of devices to LabView and NI, so forgive me if my question seems stupid.

  I have an acquisition of data NI USB-6501 I want to use to connect to a device that will open or close a lid when triggered.

  My question is: is it possible to programmatically trigger the nominal voltage of the USB-6501?

  I'm using LabView for this and I am running on Windows 7. I couldn't find examples of LabView bases that were related to the output voltage for the USB-6501.

  Any help would be really appreciated, thanks in advance

  Thanks for your replies.

  After a few changes, the example "Write dig Chan" helped me to get the behavior I want to put on and a device plugged power off.

• Color codes of kml (google earth html) generations of color ramp

  I am looking for a better way to take a digital input and generate an html color code which is compatible with Google Earth color codes.  The included example works somehow, but it's slow... it seems to need a delay between the writing and reading of the band of colors.  Complete to be of the form Codesseem

  oobbggrr

  where oo is an opacity of 8 bits (00-FF)

  BB is a code Blue 8-bit (00-FF)

  GG is a green code of 8 bits (00-FF)

  and rr is a red 8-bit code (00-FF)

  Any suggestions?

  It's worse than you thought. I was playing around with your VI for a bit and found out that when used as a Subvi and with closed front panel, the result is false. I recoded the VI based on your second version using the property node Value and discovered it works much easier. He didn't need a period of time, and it seems to return the correct values that the façade is open or closed. See the example attached to see what you think. A rather "interesting" behavior of the command of color ramp.

• Agilent U2722A linear voltage ramp

  I am currently writing a LABVIEW VI to interface with an Agilent U2722A. I want to measure current constantly while maximum increase of voltage of 0V to a defined use specifying the step size and no time (a linear scan of tension).

  I downloaded the driver for this device which also includes an example used for output and then take action. My first problem is that when I run this unit VI is to expire. I think that this issue MAY have something to do with the entry "triggered the level". Happened to configure voltage channel VI. I have included the example and the voltage setting channel Sub VI.

  My lack of understanding for the other SubVIs (which are based on being passed SCPI commands by VISA as strings) also prevents me from making progress. Especially the scan configures and configure trigger screws

  Scanner Confgiure takes the values for the number of points and the timestep. I don't know how I'm supposed to make use of this VI. Should I put the values you want, and then use a loop to pass different values to the chain tension set up with each iteration. Also, how is the measured timestep? I need to set up a trigger to measure the time between the points or the scan function takes care of that? I've included the sweep set up VI as the Timestep VI as well.

  Looks like that you've got another error in connection with the IO instrument. Here are some references for this error,

  -420, "request not COMPLETED;

  This error occurs when you addess the instrument to talk and he has nothing to say.

  The most likely causes are:

  1. do not send a query. You must send a valid request to the instrument before talking to talk to him. This is true even of the instruments of measurement, such as the 2001 model. You can not get a reading from 2001 until you send him a request.

  2 send an invalid request. If you sent a request and still get this error, make sure that the instrument treats the query without error. For example, send a bad request that generates an error - 113, "Undefined header" and then treat the instrument to speak will generate an error-420, "Request not COMPLETED" as well.

  3 query invalid due to an invalid command.

  Currently I do not have an instrumetn in hand so I can't understand what is exactly what's wrong, but would you mind to paste your code so that we can look into it together?

  The most accurate method is absolutely one provided by the material itself. Here is "Interval" in configure Sweep.vi.

• How to voltage ramp

  Hi all

  I am a beginner on LabView and have written a program to generate the next ramp below. Using the graph, it seems to work, however when I plug a scope or a voltmeter to the map, I see no output. Why?

  you posted this forum instead of the labview Labwindows forum.  You probalby get a faster response there.

• Clock at 10 MHz continues with 1.8 Vpp using 6544

  Hi everyone, I need to have a continuous 10 MHz clock with the help of 8Vpp 1, NI6544. In the examples, I found these 3 examples for me:

  1 dynamic generation with voltage Configuration.vi (example HSDIO)

  2 dynamic generation with exported (example HSDIO) Clocks.vi

  3 gen Dig Pulse Train-continues-Dig Start.vi (example Daqmx)

  I have the NI6733 Council. But it wouldn't work with a frequency of 10 MHz. I don't know that it should be fairly simple to build. But I'm stuck right now.

  Thank you, Yan.

  I think I know what I'm supposed to do with the clock. It seems that I have to generate signals in DIO terminals or I need the signals digital or not.

  How can the question, I get a single signal with just Boolean out 1 DIO. I mean, I want to have a controllable DIO with boolean regardless of the time. It's like I would have:

  DIO0--> set to true, it gives me 1, 8V. If set to false, it gives me 0V. And it continues to run until it is manually stopped.

  Thank you

  Yan

• Python USB control 6009

  Hello

  I'm trying to use python (with types) to control my USB-6009.  The goal is to write an analog voltage and then read the voltage across an entry with the possibility to change the number of points on average and the number of times that it is repeated (sweeps) averaged analog analog input Board.  The problem is that, as we increase the number of times the voltage ramp is repeated (scans), we get a time-out error (call nidaq failed with the error-200284: ' some or all of the requested samples are not yet acquired).  This value confuse us because the scans are in a larger loop and the function of data acquisition should be the same if there is 10 scans (work) or 1000 scans (crashes).  Any ideas would be greatly appreciated.  I have included the code below for reference.

  import types

  Import numpy

  the import of time *.

  import of the operator adds

  NIDAQ = ctypes.windll.nicaiu # load the DLL

  ##############################

  # Configuration of the typedefs and constants

  # to match the values of

  # C:\Program NIUninstaller Instruments\NI-DAQ\DAQmx ANSI C Dev\include\NIDAQmx.h

  # Settings for scanning

  aoDevice = "Dev2/ao0".

  aiDevice = "Dev2/ai0.

  NumAvgPts = 10

  NumSweeps = 50

  NumSpecPts = 100

  filename = "12Feb15_CO2 Test_12.txt".

  Readrate = 40000.0

  Sample rate = 1000

  StartVolt = 0.01

  FinalVolt = 1.01

  voltInc = (FinalVolt - StartVolt) / NumSpecPts

  # Typedefs

  Int32 = ctypes.c_long

  uInt32 ctypes.c_ulong =

  uInt64 = ctypes.c_ulonglong

  float64 = ctypes.c_double

  TaskHandle = uInt32

  # constants

  DAQmx_Val_Cfg_Default = int32(-1)

  DAQmx_Val_Volts = 10348

  DAQmx_Val_Rising = 10280

  DAQmx_Val_FiniteSamps = 10178

  DAQmx_Val_GroupByChannel = 0

  ##############################

  def CHK_ao (err):

  «"«a simple routine check error»»»

  If err<>

  BUF_SIZE = 100

  buf = ctypes.create_string_buffer ('\000' * buf_size)

  NIDAQ. DAQmxGetErrorString (err, ctypes.byref (buf), buf_size)

  raise RuntimeError (' nidaq call failed with error % d: %s'%(err,repr(buf.value))))

  If err > 0:

  BUF_SIZE = 100

  buf = ctypes.create_string_buffer ('\000' * buf_size)

  NIDAQ. DAQmxGetErrorString (err, ctypes.byref (buf), buf_size)

  raise RuntimeError ('nidaq generated WARNING % d: %s'%(err,repr(buf.value))))

  def CHK_ai (err):

  «"«a simple routine check error»»»

  If err<>

  BUF_SIZE = NumAvgPts * 10

  buf = ctypes.create_string_buffer ('\000' * buf_size)

  NIDAQ. DAQmxGetErrorString (err, ctypes.byref (buf), buf_size)

  raise RuntimeError (' nidaq call failed with error % d: %s'%(err,repr(buf.value))))

  def Analog_Output():

  taskHandle = TaskHandle (0)

  (nidaq. DAQmxCreateTask ("", ctypes.byref (taskHandle) "))

  (nidaq. DAQmxCreateAOVoltageChan (taskHandle,

  aoDevice,

  "",

  float64 (0).

  float64 (5).

  DAQmx_Val_Volts,

  None))

  '''

  (nidaq. DAQmxCfgSampClkTiming (taskHandle,"", float64 (Samplerate), ")

  DAQmx_Val_Rising, DAQmx_Val_FiniteSamps,

  uInt64 (NumAvgPts))); # means that we could turn into this growing streaming and playback

  '''

  (nidaq. DAQmxStartTask (taskHandle))

  (nidaq. DAQmxWriteAnalogScalarF64 (taskHandle, True, float64 (10.0), float64 (CurrentVolt), None))

  NIDAQ. DAQmxStopTask (taskHandle)

  NIDAQ. DAQmxClearTask (taskHandle)

  def Analog_Input():

  global average

  # initialize some variables

  taskHandle = TaskHandle (0)

  data = numpy.zeros ((NumAvgPts,), dtype = numpy.float64)

  # now on the program

  CHK_ai (nidaq. DAQmxCreateTask ("", ctypes.byref (taskHandle)))

  CHK_ai (nidaq. DAQmxCreateAIVoltageChan ("taskHandle, aiDevice," ",)

  DAQmx_Val_Cfg_Default,

  float64(-10.0), float64 (10.0).

  DAQmx_Val_Volts, None))

  CHK_ai (nidaq. DAQmxCfgSampClkTiming (taskHandle,"", float64 (Readrate), ")

  DAQmx_Val_Rising, DAQmx_Val_FiniteSamps,

  uInt64 (NumAvgPts)));

  CHK_ai (nidaq. DAQmxStartTask (taskHandle))

  read = int32()

  CHK_ai (nidaq. DAQmxReadAnalogF64 (taskHandle, NumAvgPts, float64 (10.0),)

  DAQmx_Val_GroupByChannel, data.ctypes.data,

  NumAvgPts, ctypes.byref (read), None))

  #print "%d points"%(read.value Acquired).

  If taskHandle.value! = 0 :

  NIDAQ. DAQmxStopTask (taskHandle)

  NIDAQ. DAQmxClearTask (taskHandle)

  average = sum (data) data.size

  Thank you

  Erin

  This forum is for questions of LabVIEW .

• Time-out error when you try to calibrate a PXI-6552 using Calibration Executive.

  I make a mistake I never saw elsewhere trying to calibrate a PXI-6552 using Calibration Executive. We have been calibrating these cards for 3 years and never had a problem. The error I get has to do with the HP 3458 A DMM taking a reading.

  1074126845 error occurred at IviDMM Read.vi in audit generation step voltage
  The possible reasons: maximum time state of the driver (Hex 0xBFFA2003) exceeded before the operation is complete.
  The primary error: (Hex 0xBFFF0015) timeout expired before the operation is complete.

  As soon as Cal Exec implements the PXI-6552 module then will take a reading of the 3458A what an SRQ message on the 3458A, then the error message above appears in Cal Exec. I tried to reinstall the drivers OR DMM. The voltage on the meter screen is good for the first stage (5.5 volts DC), but it times out and gives me the error as indicated.

  Nevermind, I got the latest drivers and install and everything works fine now.

• How to cut a pieces to each saw tooth waveform?

  I spent a lot of time trying to tackle this problem and hope someone can offer a useful overview.  I have attached the VI described here.

  I am using an NI USB-6212 data acquisition-related Labview to create a voltage ramp, which results in a laser through its analysis.  The laser is pointed at a detector, and at the same time, I read in a signal of the detector using the same DAQ. Because the detector is illuminated by the laser, it shows the scan pad.  I would like to repeat what voltage scan and read - in indefinitely.  A large part of this system works.  I used the "RampPattern.vi" to create a sawtooth wave, which is exit with success the acquisition of data.  As expected, the entry of the sensor shows the same trend sawtooth.  However, I am having a lot of trouble dealing and displaying the digitized seesaw of the sensor, which is currently read in as a waveform.

  The challenge that I can't move is manipulate or collection of the tooth of saw so that I can do two things:

  (1) view the entrants saw tooth a 'tooth' at a time.  Each saw tooth represents a laser scan and I would like to see the ramp to scan incoming as a single slope, not a series of sawtooths.  Ideally, as each analysis came, he would replace the previous analysis (as in the "Graphic" Labview), while the plot would show a stationary scan that would flicker to the entrance of the last analysis.

  (2) divide the entrants on each table ramp sawtooth never updated that can be followed with mathematics, stored in a file, functions etc.

  I have a feeling that it wouldn't even be a back of a donkey for an experienced user, but I was hooked on it.  Could I collect the analog signal entering the detector into pieces that are the length of each ramp?  I could an event at each ramp that would split the waveform in a table?

  I am open to any suggestions!  I thank you for the input and help,

  Sam

  Problem solved!

  The solution was to wire the parameter 'number of samples per channel' in VI of reading DAQMx.  I put the 'number of samples per channel"number of points to each scan sawtooth (this is the same value as 'number of waveform samples", used to generate sawtooth in BasicFunctionGenerator.vi).

  The analog playback VI DAQMx now reads a sawtooth, both.  The waveform graph shows each saw tooth, at the same time as they appear.  Also the output waveform has the appropriate dimensions (the duration of the analysis), and I can perform mathematical operations on each single sweep.

  Works great! I posted the working code.

• Typedef Union... failed

  Hello

  I've seen in a post that it is possible to create a union in LabVIEW [and without using a dll]

  but I do not understand the method, y at - there someone who can help me and explain how

  manage this trick in the following example:

  typedef struct _ssscmddata_haltest
  {
  U8 test_flags; Reserved, must be zero
  U8 test_start; SSSVAL_HAL_TSTART_xxxx
  U16 target_output; To the target in milli-amps or volts output
  U16 time_ramp_tgt; Target time in tenths of a second to the voltage ramp
  U16 time_hold; Target time in tenths of a second to maintain the tension
  U16 time_ramp_zero; Time in tenths of a second to the ramp to zero volts

  Union {}
  float r; Generic access
  float milli_amps; HIPOT. Used only at the end of the test for determining the pass/fail.
  float mega_ohms; DCIR. Used only at the end of the test for determining the pass/fail.
  float milli_ohms; BENJAMIN. Used only at the end of the test for determining the pass/fail.
  } lo_limit;

  Union {}
  float r; Generic access
  float milli_amps; HIPOT. Test fails immediately in case of exceeded this limit.
  float mega_ohms; DCIR. Used only at the end of the test for determining the pass/fail.
  float milli_ohms; BENJAMIN. Used only at the end of the test for determining the pass/fail.
  } hi_limit;

  U8 arc_detect; 0 to 9, 0 = disabled, 1 = most sensitive,..., 9 = least sensitive
  U8 channel; HAL: 0, HALSCAN: 0 to 4, G2, 0 = front, 1 back =
  } ssscmddata_haltest;

  [Thanks in advance:-]

  I may be a bit thick here, but what is the purpose of the union in your example?  I remember my days of line code that a Union is designed to manage several types of data into a memory block.  Your unions being all the floats, you could use simple float lo_limit/hi_limit and without the need to use a union.

  without searching the forum for trade unions, the closest direct structure of you, I can think of that would be an array of U8s, initialized to the specific number of bytes of your Union the most important "variable".   Then apply an overall style LV2 to prevent new memory allocation.  I'm not sure of is the efficiency of conversion in and out in the table.  Also, I don't know if you save a string with a number of characters if Labview not redirect memory anyway.

  Pei

• What is the best 'color settings' for documents 4 colors Photoshop 9.0 for eventual printing on a printer? Thanx

  What is the best 'color settings' for documents 4 colors Photoshop 9.0 for eventual printing on a printer? Thank you, Scott

  The 'best' color settings are profile and end points specified by your lithographer. You can see that the work will be produced in CMYK mode, it can specify a RGB. (One of the reasons why it might ask for an RGB file and perform the conversion itself is so that it can prevent its competitors its CMYK settings that apply to the GCR, generation of black [ramp] and limit of total ink regarding specific paper.) Its recommendation may also vary depending on your choice of paper and the surface of the paper. If the choice of the particular lithographer cannot be done at this time, it is generally acceptable to provide the Adobe RGB file with the default settings of Photoshop.

• Want a ramp of output voltage over time and measure input 2 analog USB-6008

  Hello

  I want to produce an analog voltage output signal that increases over time with a certain slope, which I'll send in a potentiostat and at the same time I want to read voltage and current (both are represented by a voltage signal) that I want to open a session and ultimately draw from each other. To do this, I have a DAQ USB-6008 system at my disposal.

  Creation of the analogue output with a linear ramp signal I was possible using a while loop and a delay time (see attachment). Important here is that I can put the slope of the linear ramp (for example, 10mV/s) and size level to make a smooth inclement. However when I want to measure an analog input signal he's going poorly.

  To reduce noise from the influences I want for example to measure 10 values for example within 0.1 second and he averaged (this gives reading should be equal or faster then the wrong caused by the slope and the linear ramp step size.) Example: a slope of 10 mV/s is set with a 10 step size. Each 0.1 s analog output signal amounts to 1 mV. Then I want to read the analog input in this 0.1 s 10 values)

  Because I use a timer to create the linear ramp and the analog input is in the same loop, the delay time also affects the analog input and I get an error every time. Separately, in different VI-programs (analog input and output) they work fine but not combined. I searched this forum to find a way to create the ramp in a different way, but because I'm not an experienced labview user I can't find another way.

  To book it now a bit more complicated I said I want to measure 2 input analog (one for the voltage of the potentiostat) signals and one for the current (also represented by a voltage signal) and they should be measured more quickly then the bad of the analog signal. I have not yet started with because I couldn't read on channel work.

  I hope someone can help me with this problem

  An array of index. You want to index the columns for a single channel.

• PXIe6556 - how to change the voltage of output during the generation?

  I would like to know if it is possible to change the voltage output (data lines) during the generation?

  1. start the generation - Vout = 1V

  2. change of output voltage without stopping the generation of Vout = 1.2V

  3. change of voltage output of...

  TKS

  Try searching for "Advanced: incarceration strategy property attribute ' and ' voltage levels: data voltage range property" in aid of generator/analyzer of signals for the digital waveform installed with your driver. This should allow you to change the levels of tension on the fly. To use this attribute, you must have the latest driver HSDIO (2.0).

  Is that what you are looking for? It is an advanced attribute, and most of the use cases should not dictate it you have been warned. I hope this helps!

• Precise triggering voltage input and output generation in the DAQ Assistant

  Hello

  I wonder if anyone has come across a simular problem with the synchronization of input and output voltage. I use a box 11 LabView and NI USB-6259. I have been using the DAQ Assistant to configure the input and output channel. In particular, my task is to generate a single rectangular "pulse" as the output voltage to drive a coil and once the pulse went to get a signal from a sensor of magnetic field and get a power spectrum. This means that the order and the time during which the DAQ Assistant is used is extremely important. For example, the output voltage channel must be opened first for 2 seconds. Subsequently, the channel of input voltage must be open for 1 second, in which the sensor signal is obtained and post-processed. Only after these tasks are performed in this order he can can be repeated in a loop until the experiment is over. I don't know how to trigger data acquisition assistants (one for entry) and the other for the voltage output correctly. Y at - it a trick?

  See you soon

  Michael

  Hi Dave,.

  Thank you that I wired the error strings but the timing issue was unrelated to it. In the DAQ assistant, I simply had to choose the continuous aquistion of the 'samples' methods 'N-switch' for input and output voltage and all works fine now.

  Thanks again

  Michael