How to 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

• 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.

• Generation of voltage ramp

  Hello

  I'm totally new to LabView using Labview 8.6.

  I have a PXI-6704 and on three channels, I should generate a ramp between 0V and 840 mV less than 1 ms, then the signal must remain constantly at the 840 mV. This signal will begin some on-chip oscillators.

  I checked the other kind of similar examples as well, but as it's my first experience in LabView I really understand many of them.

  Please can someone help I have to use to get the EXPECTED signal? Or if someone has a vi to do this...

  Thank you

  Kriváň

  Help > examples > entry & exit hardware > DAQmx.

• How to the ramp of the screen of the Touch pad when you don't call

  Hello team,

  We have CTS 1300-65 unit that has Cisco Telepresence touch (8 inch). We need timeout the device when the device is not under appeal. In other words, we must save energy in gradation or turn off the screen of the touch device. Please let me know the procedure.

  Thanks in advance,

  Solomon Kavala.

  Hello, Solomon,

  I'm not sure, but according to my knowledge about touch 12, it is not possible to put it to sleep

• HP ENVY 4520: OFF-RAMP WIRELESS

  Someone please TELL ME HOW "The off-ramp wireless PRINTING" AND BACK to FEEL ORDINARY.

  Thank you very much.

  Information is in your user's Guide.

  http://support.HP.com/us-en/product/HP-envy-4520-all-in-one-printer-series/5447920/model/5447921/manuals

  Enable or disable the printer WiFi

  On the printer Panel blue wireless light is lit when the printer WiFi enabled.

  1. in the printer Panel, touch (wireless) and then press (settings).
  2. press to turn on or off the Wireless.

• How NI PCI 4474 DSA detects an overload to the input channel?

  I read "Manual user OR dynamic signal acquisition." It is written that NI PCI 4474 support only digital overload detection.

  Here's my question. What is the detection of digital overload? If an analog signal is already converted to digital signal, it can not be signals exceeds the limit. Or the DSA may already be damaged during the CDA process, if there is surcharge from the input signal. Thank you.

  Hyun

  Yes, the chip has more information about the Board and apply factors of calibration, which is how it can overflow.

  What we call "detection of overload analog domain" requires more equipment (i.e. a comparator circuit) to observe the input signal.  Given that the Committee in question is not a comparator to check the input signal, and the way we want to give the user an idea of whether or not their signal is too large, we simply use the mathematics inside the chip. It's better than nothing.

  Oh, and I should mention that the protection is managed by a completely different circuit.  The specification should say how much voltage you can apply to the Commission before the protection comes into play.

  Germano-

• When I send a 5v of data acquisition, the voltmeter indicates 5V, but when I connect a "normally open" valve Parker for the acquisition of data, the voltage decreases automatically a.14 V. It seems to be grounded. Why is this happening?

  We send 5v data acquisition using a voltage generator. Hook us it up to a voltmeter and see 5V. When connect us the generator voltage to a valve "normally open" parker, the voltmeter indicates .14V. It seems that when we connect the two sons of the valve for the voltage generator, the son act as pattern. We want to control the voltage flowing to tap through Labview. We checked the wires to the valve and they work very well, because if we send a constant 5V since the acquisition of data and put ashore, she, the voltmeter indicates 5V. Someone knows why the son act as pattern and low blood to .14V?

  nsatpute wrote:

  Our data acquisition is NI USB-6259. The valve requires only a 5V max and our DAQ provides up to 5V. However, after connecting the valve to the acquisition of data, the grave tension to almost 0. We start from the principle that the son somehow act as the reason, but we are not sure if this is the case.

  The question here is not how much voltage the valve wants, it's the current needs of the valve.  The 6259 can put only 5mA via an analog output.  Your very likely tap needs much more than that.  If you need to add in an amplifier circuit that can supply more current to operate your faucet.

• 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.

• How will I know if phone is charging.

  Hi all

  is there any listener who listen the phone is supported. How much voltage is available and how much blood get us the charger. We can get the DeviceInfo battery status, but that's not what I need. I need to implement is as soon as possible, I would appreciate the help.  Thank you...

  Thanks and greetings

  Shashank

  You can use SystemListener batteryStatusChange.

  The parameter status passed will be a combination of the any BSTAT_XXX of the DeviceInfo class flags. You can use this method more DeviceInfo to get what you need.

• 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

• General DAQ system design

  I'm designing a new data acquisition system.  I just need some advice on how to design a system properly to acquire data accurately without too much exaggeration.

  During the event of 100 ms, we would capture four pressure curves (event unique, non-periodic) and voltage of several spikes (indicator time to specific event).  We would use a charge amplifier to amplify the signal from pressure sensors.

  Can someone point me in the direction of some books useful, tips, rules, basic Web sites, theorems, etc. to design a system for the acquisition of data including but not limited to, the following topics?

  Sampling frequency:

  What criteria should be used to determine the frequency of sampling?  As the waveforms will not periodic, I think not that the Nyquist theorem applies.  Are there any general rules in this case?

  Voltage range / Amplification:

  How much I amplify my signals?  Our specifications define a scheduled pressure, the maximum value, maximum pressure, that the system should handle and tolerances.  How many voltage range must be a signal medium or maximum signal?

  Data bits:

  How can I determine how many bits of data (and the distinct values so) I need to acquire the characteristics of my curves of pressure with accuracy?

  Hi Steven,

  I have a few PowerPoint slides (attached) of the hands on Session of the week DAQ last OR that give an overview of these three specific themes.  They were meant to be more than an auxiliary to the presentation, so they do not have too much information, but the images that seem to be always helpful (there are animations so you will have to go through the slides in presentation mode).

  Sampling frequency:

  It really depends on what you're trying to measure.  You're right that Nyquist frequency applies that periodic signals (you won't have aliasing if the signal is not periodic), but the sampling rate is always very important depending on how much you care to characterize the shape of your signal.

  If the signal changes rapidly, you will want to ensure that you are sampling quickly enough to acquire enough samples along the transition to be able to characterise the dash (if this is important to you).  On the other side of things, if you're sampling too slowly, it would be possible to completely miss a pulse if its duration is less than the period of your sample clock.

  Voltage range / Amplification:

  They are definitely together.  To optimize the resolution of the ADC, you want to choose an amplifier that fills the whole range of ADC.  Many DAQ cards have integrated amplifier and provides several beaches available (although in DAQmx the user specifies just coming available they want).

  Bits of data (aka resolution):

  It doesn't tell you the number of discrete levels available that you can represent the entire range of data acquisition card.  However, this value is different from the precision due to the error of gain/offset, nonlinearities in CDA and noise.  If you are interested to determine the accuracy of your measurements (which is quite common), you should check the specs of the device and look for the specification of absolute accuracy.

  So in general, I think that you need to understand what are the exactly your needs before selecting equipment.  Are what information you trying to determine from your curves of pressure?  Is the digital signals voltage just spikes that must be timestamped?  What this timestamp would be compared to?

  Best regards

• 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 .

• Tension could not dwell

  Hello

  Recently, I'm working on a small program to regulate the voltage. A DC voltage can be control by the output signal of a PCIe-6341. The program controls the flexible high voltage to change from zero to 7000V in 5 seconds and be stable to 7000V to 5 minutes and then go down smoothly at 0V in 5 seconds.

  Now the question is, to linger over the tension, the signal does not remain on the latest issue. The signal voltage falls to zero and make high voltage to zero. How the voltage of stable signal a final reading, then go down smoothly to zero?

  Thank you!

  Kyle-Z wrote:

  Hello

  ...

  Now the question is, to linger over the tension, the signal does not remain on the latest issue. The signal voltage falls to zero and make high voltage to zero. How the voltage of stable signal a final reading, then go down smoothly to zero?

  Thank you!

  because you default the return value to zero in the case statement to linger and let out a shift register...

• How to find or change the voltage setting set in a series of HP TouchSmart IQ500

  How do I find or change the voltage setting set in a series of HP TouchSmart IQ500 (specifically an IQ524)

  It does not use an external power adapter? If so, all you need to use in another country is an adpater sheet to match the wall outlet.