Gradual increase of the output voltage

Similar Questions

• How to control the output voltage?

  Good time after some time can get the output voltage, but this value is alwayscontinuous. How to control the voltage output through a Boolean? In

  in order to get this tension when I want to.

  Greetings.
  Hugo Santos

  Hi Hugo,.

  If you use a LabVIEW project, you must set the time of sampling in the properties of the node (see SamplingInterval.png). But this time to refresh the data should be high enough. If you take into account this update of time trying to control your way out.

  Kind regards

• How to configure the outputs voltage NI 9477

  Hello

  I'm trying to control a motor using a cRIO 9074 with the NI 9477 module. I would like to configure the output voltage of the module and if I understand correctly, they vary between 5 to 60 v.

  How can I have a 24 v output?

  Thank you.

  JaneDoe94 wrote:

  So if I understand correctly, I can use an exit as a switch?

  If I choose resistance pull-up so the current stay under 1A, would this work?

  For example, I am using R = 20 kOhm and DC = 24V. I need to stay below 5mA current.

  9477 module is basically a relay to connect to the Earth.  But beware of your voltage and current limits.  The maximum current that can flow is 0.625 A by line.  So make sure that you stay below that.

• How the output voltage is coded on 16 bits DAQmx devices?

  In our laboratory, we have two devices DAQmx, the NOR-PCIe-6363 and the NOR-PCI-6733. Both have 16-bit for bipolar analog output precision. I understand that the small voltage difference that can be made is 2 * Vref/2 ^ 16, where Vref is the reference AO voltage (10 Volts or externally provided for 6733, 10 or 5 Volts or externally supplied for the 6363).

  I wanted to know how the output voltage is coded. DAQmx functions take 64 bit floats as input, and at some point, they must have their reduced accuracy. How is this done rounding, is a floating point around the nearest possible tension, or is always rounded down or always rounded upward?

  What is all the possible output voltages? Some diagrams in NOR-DAQmx help/measurement Fundamentals, signals, Analog, sampling considerations seem like they could involve the maximum voltage + Vref is not achievable, so I think that is all of the possible tensions - Vref + 2 * Vref * n/2 ^ 16, with n ranging from 0 to 2 ^ 16-1 included. This includes - Vref and does not zero but + Vref.

  Could I get confirmation on this point, or be corrected if it is wrong?

  Hi Chris,

  The scale of writing DAQmx version performs double floating precision scaling and then he made a turn, the closest to convert the resulting code of the DAC to double int16_t (or uint16_t for unipolar devices). Floating point scale includes the custom scale AO if you have configured one, the conversion of volts or AMPS to the codes of the DAC and for some devices, the calibration scale.

  You can check the coefficients of scaling using the AO. Property of DevScalingCoeff. It takes V / A-> CAD codes and scaling into account calibration, but not the scales to customized AO.

  The PCIe-6363 X series devices preset scaling in software. The internal reference of the AO is slightly higher than 10V, to correct the errors of gain and offset does not limit the output range. It also means that you are not limited to 9.9997 V on this device when you are using an internal reference.

  The PCI-6733 uses calibration DAC instead of software scaling. RAW - 32768 means - 10 V, 0 corresponds to 0 V, 32768 is impossible because of two of the 16 bits of the add-in and 32767 translates 9.9997 V. When you continue 10 V to write DAQmx with this device, DAQmx he forced into 9.9997 V.

  Note that for these two devices, the absolute accuracy full scale includes over 305 uV of error. Look at the tables of absolute precision AO in the specs of the device for the full story.

  Brad

• at the start of a song or a video or after interruption of the sound is a gradual increase of the volume set, how to remove this feature?

  As the title says every time I start a song or video the sound made a smooth start... same thing when I boot from a break. It's very annoying when bike video in particular because it takes to come back back just so you can hear what is said after the original location of the break.

  Thanks in advance for any help.

  Hello

  The problem occurs when you watch videos online using Internet Explorer?

  Method 1
  I suggest you to run Windows media player convenience store settings.

  Open the troubleshooting Windows Media Player settings Troubleshooter
  http://Windows.Microsoft.com/en-us/Windows7/open-the-Windows-Media-Player-settings-Troubleshooter

  Method 2
  I suggest you try the steps from the following link:

  Tips for solving common audio problems
  http://Windows.Microsoft.com/en-us/Windows7/tips-for-fixing-common-sound-problems

  Additional information:
  Change volume settings in Windows Media Player
  http://Windows.Microsoft.com/en-us/Windows7/change-volume-settings-in-Windows-Media-Player

• Update of unique value in the loop voltage output?

  Hello

  I'm trying to use the DAQmxWriteAnalogScalarF64 function to produce a voltage constant and regular say 3V.  The program will be in a loop, and after each iteration, I would that the output voltage be increased to say 0.1V.

  So, a shortened version of my program looks like this

  float64 value = 3;

  DAQmxCreateTask

  DAQmxCreateVoltageChan

  DAQmxWriteAnalogScalarF64 (TaskHandle taskHandle, bool32 autoStart, float64, float64 value, timeout, bool32 * reserved);

  Loop

  {

  DAQmxStartTask

  DAQmxStopTask

  }

  Now of course who does not help me update the output voltage after each loop.  So I tried something like this:

  Loop

  {

  DAQmxWriteAnalogScalarF64 (TaskHandle taskHandle, bool32 autoStart, float64, float64 value, timeout, bool32 * reserved);

  DAQmxStartTask

  DAQmxStopTask

  value = value + 0.1;

  }

  My computer would crash when I try to run the program.   I have to erase and create the task in each iteration too?

  I try to avoid using the DAQmxWriteAnalogF64 function, because I need to use a sample clock in time, he and my sample clock is used for the other channel of analog output.

  Thanks for any input.

  Howard

  aNItaB,

  I tried to call the DAQmxWriteAnalogScalarF64 in a loop and freeze my computer completely and I have to restart it by pressing the Start button.

  Then, I tried to use the DAQmxWriteAnalogF64 in a loop, specifying the output as an array of one element array, and then to update an element at the beginning of each loop.  This seemed to have solved my problem for now without any computer breaks down.

  A strange thing happened was when I took your suggestion and took the StartTask and StopTask out of the loop, the computer crash problem appeared again.

  in any case, I think that my problem has been resolved, thank you very much for your responses timely and sincere help.

  Howard

• How do I capture the output of voltage full bridge with Signal Express NI9219

  Hello.  I'm trying to do and calibrate a load cell with the installation of full-bridge strain gage.  I use a NI9219 module with a cDAQ chassis.  Is it possible to capture the actual output voltage?  Signal Express gives me a value of strain, but I really need to know the output voltage.  Where to look.  I need only two channels for full-bridge.  I think that could connect the wires to the two remaining channels and read the output voltage of the strain gauges which would be connected as a tension of the 9219 entry, but I think that Signal Express could give me the voltage and output voltage directly.  Any input would be appreciated. Thank you!  P.S. I only use this equipment on occasion and am not the more familiar with it, so keep things simple for me.  Thanks again.

  Hi jgh@AET,

  The NI 9219 measures the ratio of voltage full bridge in hardware sensors, allowing any variation of the voltage to cancel. You won't be able to measure the output voltage of the sensor regardless of the voltage without additional channels, but you can measure the ratio of raw tension using the type of Bridge (V/V) . You can also use the type of measure of Force (bridge) measurement of load cell with engineering units (N, lb, kgf, no strain).

  This screenshot shows where the two Bridge (V/V) and Force (bridge) can be selected in the DAQ Assistant:

  

  These types of measurement were added sometimes around DAQmx 9.1, so if you have an older version of NOR-DAQmx, your DAQ Assistant maybe not them. The latest version is currently 9.4 of NOR-DAQmx. Front of NOR-DAQmx 9.1, the approach to recommend to measure the load cells was to use the custom with Excitation voltage type and a custom scale. However, Tension Custom excitedly can't Bridge of calibration in the DAQ Assistant.

  Brad

• can I connect the outputs analog of a DAQ configuration in series to have the highest voltage source?

  Hello guys,.

  My question is provided in the topic, you have an idea about that? your help is appreciated.

  ELA

  Hi Ela,

  For almost all devices supported by DAQmx, you can't. When all AO channels have the same motive, connecting them in series would be short the output channel on the ground, which is bad.

  However, there is one exception: the SCXI-1124 module has channel-to-channel isolation, which allows channels to be cascaded to output voltages: I can cascading the output voltage of an SCXI-1124 module?

  With channel-to-Earth isolated peripheral (such as NI 926 x or NI 623 x), you can cascade multiple devices together, but not multiple channels on the same device.

  Brad

• Find the strength of output voltage

  My VI generates a graph displays the output voltage of two 250 lbf (http://search.digikey.com/us/en/products/FC2311-0000-0250-L/MSP6952-ND/809398) to load data sheet (http://www.meas-spec.com/downloads/FC23.pdf) cells. I am trying to determine how much force is applied to the my output voltage load cell. So basically how to convert the output of a tension force (Newtons). Thank you.

  Sheet indicates that the nominal power is 100 mV at load full scale and 0 at no charge.  If you neglect the mini-maxi offset of zero and span min - max variation, you have 250 lbf/100 mV.  Then multiply by the conversion factor appropriate in newtons.  To account for the offset and gain variations, you might use a linear correction by solving the equation of a line (y = m * x + b) at two points, one with and without load near full scale.

  Some DAQ drivers put the scale included.

  Lynn

• Output 2 length of time different voltages while recording the current of one of the outputs

  I create a vi that generates output 2 waveforms of voltage different (AO1 and AO2). These signals is different in duration and number of times it will be produced. AO1 must take place several times while AO2 is running her first time. I also record the entry of AI1 output in AO1. I have attached a vi that I thought it would work. I thought it would be good to have the AI/StartTrigger initialize the acquisition and the output voltage. However, this arrangement results in an error. The error I get is-200802. Am I going about this all wrong? Any ideas?

  At first glance, I see some problems with your code:

  -You arecalling DAQmx writing before calling DAQmx Start. The departure must be called before writing.

  -You have two tasks of analog output. Only analog output task is allowed per unit. If both of your analog output channels are on the same card, they must be in the same spot.

  Here is a great resource for getting started with DAQmx programming.

• How to get Strain Gage output voltage

  Hello.  I'm trying to do and calibrate a load cell with the installation of full-bridge strain gage.  I use a NI9219 module with a cDAQ chassis.  Is it possible to capture the actual output voltage?  Signal Express gives me a value of strain, but I really need to know the output voltage.  Where to look.  Thank you!  P.S. I only use this equipment on occasion and am not the more familiar with it, so keep things simple for me.  Thanks again.

  Then, it is quite simple. Two channels:

  Ch01 - DAQmx acquire > an analog Signal > choose voltage: range min/max of the actuator load cell enter the installation of voltage input range (+/-5 k for example), and then create and apply a custom scale (choose the beaches of the table) where the +/-10V = full scale commercial load cell. Once applied "Scaling of units" should be updated automatically to display custom units you defined in the scale.

  Ch02 Custom with Excitation voltage: range of input Signal (can probably leave default), scaling of units = voltage, E.g. Source = internal, Ex value = 2.5V, use Ex for unchecked staggered, depending on Configuration Configuration Terminal, Custom Scaling = none.

  Optional: I normally add an amplitude and levels (analysis > measures Time-Domain) step, drag and drop the "DC" signal on both channels in the graph and create a scalar XY Chart, so I can see my field in real time.

  Add a record to the ASCII step and save the two signals to Excel so you can draw your curve.

• PXI-4110 deactivation and activation of the output

  I'm programmming power CC PXI-4110. I want to activate and deactivate the outputs. I use niDCPower_Disable() to disable the outputs. and the use of niDCPower_Initiate() to activate the outputs. Problem is after I have activate the outputs with niDCPower_Disable() and with niDCPower_Initiate() that I lose all my settings as the output voltage. What I so niDCPower_ConfigureVoltageLevel() and niDCPower_ConfigureCurrentLimit() call before calling niDCPower_Initiate() then outputs are put to the required voltage.

  I want to do is turn on and off just like pushing a button on a Panel.

  For example, I call niDCPower_Disable() to open the relay switch.

  It seems to me like there is a function niDCPower_Enable() which would close this switching relay and not reset all my voltage and current limit settings.

  Any help on the best way to proceed would be appreciated.

  Figured it out using:

  status = niDCPower_ConfigureOutputEnabled (vi_4110_0, channel0Name, VI_FALSE);

  to turn off and then I start with

  status = niDCPower_Initiate (vi_4110_0);

  In this way, my diet is ready to go, but my relay is open.

  When I'm ready to close the relay I follow these steps:
  status = niDCPower_ConfigureOutputEnabled (vi_4110_0, channel0Name, VI_TRUE);

  Then later I want to open the relay call again I have only this:

  status = niDCPower_ConfigureOutputEnabled (vi_4110_0, channel0Name, VI_FALSE);

  Problem solved.

• DAQmx task start-up delay / quickly generate arbitrary output voltages

  Hello

  (Sorry, I m new to this forum and could not find a reasonable solution by using the search)

  I develop a c# multithreaded application that generates a waveform in the 'background' using output buffering simultaneously, captures the images via a firewire camera and treat them. I have a second channel DA free that I would use when debugging a marker in real-time so that I can check on an oscilloscope which is the relative condition of simultaneous processes, i.e. output a voltage of 1 V while treatment step 1, 2 Volts to processing step 2 etc. or I would be out a short spike at some critical point. This is done using a task as

  DA_Task_sgl = new Task();
  DA_Task_sgl. AOChannels.CreateVoltageChannel ("/ Dev1/ao0", "DA0" - MXVOLTAGE, MXVOLTAGE, AOVoltageUnits.Volts);
  DA_Task_sgl. Control (TaskAction.Verify);
  DA_Task_sgl. Timing.SampleTimingType = SampleTimingType.OnDemand;
  DA_Writer_sgl = new AnalogSingleChannelWriter (DA_Task_sgl. Stream);

  then, when I want to change the tension

  DA_Writer_sgl. WriteSingleSample (true blood);

  A similar technique worked pretty well using Traditional NI DAQ, but with NIDAQmx and the concept of task, it seems that a voltage of output value takes about 1.5 ms (also of time CPU) which is too slow in many cases. With Traditional NI DAQ two consecutive calls to AO_VWrite() may generate a COB with only a few µs endeavors instead. I guess that the delay in the NIDAQmx is mainly determined by start and stop work, etc.

  Is there a way to avoid all this (in NIDAQmx) and more direct access to the underlying hardware?

  (Please Don t tell me that it is a limitation of Windows, NOR-Trad code clearly shows that it was possible, clearly the thread may be interrupted during the output voltage, but is also my treatment, exactly what I want TO check with this technique, but that 1.5 ms the delay is still there!)

  (Currently used card PCI-6014 with NIDAQmx 9.x, but I think that it s not the card which is itself too slow, I can get the update rate Analog > 100 kHz on the string of voltage waveform via DMA)

  Thank you

  Joachim

  Hi fabwes,

  The snippet you posted on request AO.  This means that whenever you write we go and search equipment to generate tension.  Your assumption is correct, the slowness that you see is because of the job template.  Whenever you are calling WriteSingleSample the task is launched, the tension is out, and the task is stopped.  I suggest the following code:

  DA_Task_sgl = new Task();
  DA_Task_sgl. AOChannels.CreateVoltageChannel ("/ Dev1")

  ("/ ao0", "DA0" - MXVOLTAGE, MXVOLTAGE, AOVoltageUnits.Volts);
  DA_Task_sgl. Timing.SampleTimingType = SampleTimingType.OnDemand;

  DA_Writer_sgl = new AnalogSingleChannelWriter (DA_Task_sgl. Stream);

  DA_Task_sgl. Control (TaskAction.Start);

  DA_Writer_sgl. WriteSingleSample (false / * since we are already started, this parameter is essentially ignored * /, tension);

  This slight change gets the load to start the task of the road before start you writing.

• gradually increase the loudness

  If it of a way to change the volume of the ringtone to sound with low volume first and then gradually increase the max volume?

  Lol there is no.

  You can't change it in the settings.

  There is a walkaround tho. Create a ringtone (or just edit the m4a file in GarageBand on your Mac) as well as the volume increases over time.

  Remember that the ring cannot contain longer than 40 seconds.

• vary the value of output of the digital HIGH output voltage.

  Hello

  Is it possible to vary the values of the NOR-DAQ HIGH output voltage. If Yes please tell me how to do the same. I want to reduce tension before moving out of my camera, digital signal as my rating of device is only 3 volts for the digital HIGH.

  Kind regards

  Pradeep.

  The digital output voltages cannot be changed on your USB-6259 (that you mentioned that you use in a different thread).  Please see the specifications for more information on the digital logic levels used on your Board.

  Best regards