PIECEWISE LINEAR VOLTAGE Source BUG

Similar Questions

• Multisim: Parameter Sweep of piecewise linear voltage source

  Hello

  I did a transient analysis of a 4-stage-amplifier with a certain input pulse generated with a piecewise linear voltage source (screenshot 1).

  Now, I want to do a sweep of parameter analysis by varying the amplitude of my generated pulse.

  What is the right for this parameter? (screenshot 2)

  Thanks in advance,

  Johannes

  Hello

  You will not be able to do sweeping device/model parameters because the Amplitude of a pulse source is not actually a device/model parameter.

  For this, use the parameter of Circuit of Mutlisim feature. See the circuit attached for reference.

  I defined a new Circuit parameter (view-> parameters of the Circuit) called "Level" with a default value of 1.

  I assigned this setting to the "Pulsed value" parameter of the element of impulse voltage source.

  In the dialog parameter Sweep, I chose the Circuit parameter as the type of the parameter I want to scan, and then I selected the parameter 'level '.

  I would like to how it works for you.

• Calibration with the voltage source - float connections

  Hello

  I want to calibrate a PXI-6133 DAQ with a floating voltage source. It says in the manual of the calibration connect the positive output of the Stallion to the AI + pine. Since my source of tension is floating I connect the negative output to GND. HAVE I - HAVE GND short or leave - not connected?

  Thank you

  Jens

  Sorry, I just answered this question for my part it is logical to short-circuit the entries HAVE - and GND.

• 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.

• Branch voltage source currents abm

  Hello

  How to access the current through resistance in the voltage ABM source?

  

  I finally managed to access the current through the resistance. Others may see "Common SEO" in the Multisim help.

  

  

• Frame match, empty a waveform in the source, BUG window?

  Hello

  Use Prem 2015

  I found a few bugs with audio.

  Using the last several macbook pro spec.

  When you press 'F' to frame matching, audio only, get a waveform empty in the window Source.

  Married also with that if you press the M button to silence an audio track and play the M button switches

  turn and is more silent?

  The only way to fix at the moment is to close and re open the project.

  Thank you very much

  We have identified a problem with the reopening of the audio clips in the Source monitor Panel will often not redraw the waveform correctly. An update of force will cause the waveform redraw, as you have already noted. Another update would be to resize the Source monitor Panel (e.g.: expand horizontally) and this should be the waveforms to redraw.

• Piecewise linear function fitting

  I have data which approximates the following function:

  f (x) = A; x<>

  f (x) = Bx + C; E<><>

  f (x) = D; x > F

  I am using the non-linear adjustment function and problems with a singular matrix error. According to me, I approached my settings quite well and the best track of the fitted curve seems fairly well aligned, but it seems that's not iterate through my approximations E and F and just using what I give him. Could someone take a look at my code and give me some additional tips? The points that I particularly need are the value 'A' and when f (x) = 0 of the second function. If there is an easier way to find these values, I'm all ears.

  Thank you

  Yes, you have only four parameters.

  1. Beginning level
  
  
  2. End level
  
  
  3. first x
  
  
  4. second x

  (interpolating linearly between the first and second x from the first to the second level).

  See attachment for a quick project.

• 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

• Non-linear voltage with current variance

  [10/07/2014 edited by moderator as requested]

  I'm trying to measure the design resistance of the voltage across my test using NI9205 sample. I have a power supply current constant and 30 cm of wire across copper as connectors to my example. I'm exploring various levels from 20 to 500 my.

  However, the resistance or voltage/current ratio do not seem to be constant on current values. Current increase seem to increase the resistance of .01ohms.

  I change the lines in my daq between 200-1-5 a 10 V.(+-) of heat due to the current, and changes in the sample of it are not a factor. Is that an offset voltage when changin ranges that affects it? I use the daq with no custom scale Wizard. I do, however, collect samples from 1000 to 1000 Hz and their average.

  Tried to use 4 wire measures?

  0.01 ohm in 30cm copper wire... seems reasonable...

  so: two sons for the current and two sons for the measurement of voltage (differential).  Guess the image below that is screwed is current and voltage

  

• HP and/or Techtronix Multisim and GRAPHER

  Is there anyway to have the results of the Tecktronix and the HP o-scopes in Multisim appear in the Grapher?  Not sure why they don't, but they do not.

  Hello

  Impossible to Multisim to connect directly with third-party tools and import signals from the scopes in Multisim. If you are able to get information on the scope and create a file .csv with this information, you can import this file in Multisim.

  I got this from another forum.

  "The Piecewise linear (PWL) source accepts data as the voltage or current time. You can find this part by selecting site > component, go to the group 'Sources' then select 'Sources of voltage Signal '. Place this part on the working area, double-click it and there should be an option to open a .txt file.

• Source of voltage controlled blow - once

  Hello

  How can I set the width of the pulses produced by the one-shots-controlled voltage source? Place IWant to 0.4 sec

  Thanks in advance,

  10CHAR.

• 1V - 5v linear output using power supply 5v, voltage divider, and variable resistance

  How can I get 1v - 5v output linear using power supply 5v, voltage divider, and variable resistance?

  Have the you wired as an attachment?  Using my schema, you can calculate the current flowing through the pot based on the fall of the tension in the pot

  4V / 10Kohm = 0.0004

  Kirchhoff's current law, we know that the same current flows through the circuit so now we can calculate the leg below the wall, based on the current and the fall of desired voltage across the resistance

  1V / 0.0004 A = 2.5 K Ohm

  My scheme maintains the current flowing through the circuit of constant, so the voltage divider must never change.  Assuming a linear pot, you will get a swing of such linear voltage as measured at the wiper.  If you wired the pot, a different way, then more then likely, you change the total resistance of 5V ground that would have the common effect that would effect the tensions.

• No linearity between the pixels and width of linear scan

  Hello

  I develop a gauge width based on a linear scan camera.

  The gauge is to measure the surface of a strip steel moving at 200 m/s.

  I found a non linearity between the relationship of pixels and the actual width:

  1904 mm X 6635, 6pixels

  1308 mm X 4616, 7pixels

  814 X 2880 mm, 6pixels

  I tried the distances of work between 2600 to 2800mm.

  The field of vision is 2200mm.

  The focal length is 35 mm.

  The size of the CCD is 28.67 mm (3.5um X 8192pixels - Basler raL8192 - 12 gm).

  Someone has already faced this problem?

  Thank you

  Alexander.

  There are many ways to do it, as the adjustment of an equation in your data that you can then use, but if you want to be fast (and if you use a very quick line scan camera, so I assume you are), I think the fastest way is to use a table like this:

  

  This simply assumes that the relationship is piecewise linear, i.e. linear between point each of your measured data (and that you have already provided three).  Keep filling in the Bay of cluster with paired values (pixels, width), ensuring that the values are in a strictly ascending and 1 d interpolating function Array used here does all the work and seems to be very fast too.  You only need enough points in the table to make your quite precise interpolation for your needs.

  There are certainly ways to do it though, so someone else might have a better suggestion.

• How to get 5V off NI USB 6501 from + 5 v source

  Hi all

  I have a problem that when I plug the usb adapter into my desktop usb and measure the source pin 5V, I get the output from this PIN voltage I NI USB 6501 DAQ board. its 0v

  Y at - it all the necessary parameters to allow the + 5V voltage source.

  How can I activate the source of 5V to NI USB 6501

  Please let me know

  You don't have to do anything to turn it on. What two pins connect you to when you take the step?

• Activating/Deactivating IEPE power switch for voltage 9234

  I use this material: NI USB9162 or cDAQ9172 with the NI 9234 module. I want to be able to select weather to use regular accelerometers or IEPE accelerometers with the 9234. I built a LabVIEW Vi where I want to be able to configure the channel of the accelerometer as a voltage channel and input sensitivity data later. Here are my experiences:

  1. If I use "Voltage Custom with excitation" I get the message "no device supported found. What happens in MAX 'task to create', labview DAQassistant or 'DAQmx create a channel' + 'personalized with excitation voltage.
  2. If I use 'DAQmx create channel' (with or without excitation) and define the source of excitation and value as a property I still have the same problem
  3. If I do as well as in 1, but with the acceleration I don't have no problem Iex source parameter and value. But this isn't what I want.
  4. If I use "IEPE the enable" inside the MAX test panels I have no problem using the IEPE accelerometer and get the tension
  Can someone help me understand how I could activate an IEPE accelerometer as a voltage source?

  The problem is that you are using HAVE. Excit.DCorAC. This isn't the right to property.  AI. Excit.DCorAC must be set to DC for the 9234, by default.

  If you want to configure channel matching, you must use I. Mating.  You can get this in analog input-> General Properties-> entry Setup-> coupling

  If you want to configure each channel separately, use Active Channel in the node of your property to select a channel.  All the properties that you configure in this node is not available for the specified channel.