Explanation of a MULTISIM circuit

I need explanation for multisim14 circuit which measures speed of PM DC motor. Could anyone please explain about the need for the DC source at the speed terminal of the motor. the circuit can be found out in the example ckts of multisim 14 in machine category

Hi Amaravian:
That V2 dc source is used to simulate a constant speed load. You can see how it is linked to a rad/s to rpm converter. In other words, in the mechanical domain you are saying 20 rad/s...convert them to RPM...so they are used in the DC machine as a constant speed load.
You can highlight (select) the RAD_PER_SEC_TO_RPM component and press F1 to pull the Help for this part.
You can also, in the Multisim Help (Help > Multisim Help) find information about simulating in the mechanical domain if you go to Contents tab > Component Reference > Electromechanical Components > Machines and find some topics, like Machine Modeling and Designing in the Mechanical Domain.
Hopefully this helps understand these concepts.
Regards,

Similar Messages

How do I send my Multisim circuit in a pdf to my professor

How do I send my professor my Multisim circuits project as a pdf? My professor told me he was unable to to view the project simulation results. He told me to send in a pdf or MS Word document and I don't have word. I know there has to be a answer in the site somewhere but I can not find it. If someone could lead me in the right direction I would be very grateful. Thank you

Yup indeed, you can google it and select a fine PDF printer whose way of processing is simple and fast to help you with the related work. It will be better if it is totally manual and can be customized by users according to our own favors. Remember to check its free trial package first if possible. I hope you success. Good luck.
Best regards,
Arron

Parallel LED circuit not reading correctly

Good day,
Can anyone tell me if there is something wrong with this circuit or if the software is acting funny?
I have a voltage source positive going into 3 parallel circuits. Each circuit contains a 30 ohm reisiter connected in series to 3 parallel LED's. The LED's have a forward operating current of 20mA.
the first branch is reading 1.9V the second branch is reading 2.2V and the third branch is reading 3.4V across the parallel LED's.
hoping it is a bug I introduced or maybe I am misunderstanding how to connect the components properly.
I have a file with a cap screen to show how it is connected
Attachments:
multisim circuit.doc ‏138 KB

1. Please create .png files from your screenshots and insert them directly into the post. The little Tree icon in the toolbar just above the text box where you type your message inserts images. Some people on the Forum will not open attachements in other file formats.
2. Real LEDs have different voltage drops for different colors due to different chemical composition. Also the parallel LEDs (at least real ones) would have slightly different VI characteristics so that each of the three LEDs(of the same color) would have different currents and, thus, different light output.
3. It is not clear what your intention is. Normally LEDs are connected in series so that the same current flows through each (same color). Rather than fixed resistorrs use some king of current regulating circuit to adjust the current in each series string to get your RGB effects. Note that you will have very little "headroom" between the source (V1) and the series string of blue LEDs (~10 V).
Lynn

Why does the circuit not simulate correctly when i put two circuits in the same design.

Hi,
I have two circuits that i can simulate in their own designs and they work correctly but when i put the two circuits within the same design, one circuit does not work. I don't understand why this is happening. Could someone please explain why this is happening and how to solve it please?
Below is the circuit i'm attempting to simulate. Each little circuit is what i've made previously in their own designs.
When i simulate each circuit in it's own design i get the following waveforms.
When i simulate both of the circuits together i get the following waveforms. The yellow and red signals have been attached to the right hand side of the 10nF caps. The signals have also been offset.
Thanks for any help.

By the Multisim circuit file do you mean the .ms12 file? If so, i've attached a copy of it here.
Attachments:
NchPch togther.ms12 ‏185 KB

How to get MultiSim 10 Update

After i installed the Education Eval and ran the "check for updates" thingy, it says that there is a critical update "suu90147.exe" and it even gives directions on how to download it. but when i follow the link there is no "download" button. where is this "critical" update???

I am having the same problem when I downloaded and installed NI Electronics Workbench Group Version 10.0.1 Software (250MB) for Professionals. Brand new install on a system with no previous versions of Multisim (Circuit Design Suite) installed (though I do have LabView and LabWindows).
Message Edited by hoffmmd on 10-03-2007 11:36 AM

Hyperlink connection between labview to multisim.

hi ,
i want to open multisim circuits through labview software.is it possible?how to do this?
please reply me.
thanks in advance.
regards
basavaraj

Please stop creating double posts!
You can bump your original thread after some amount of time. But keep in mind: most members of this forum are free volunteers answering in their spare time!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Interface between labview and multisim

hi ,
i have labview 2012 full edition. i have created some blocks in lavbview and these blocks having some circuits are there i need to create those in multisim and also i need to open these multisim circuits in labview is it possible ? possible means ,what are all toolkits required?
please reply me
regards
basavaraj

Yamaeda wrote:
DLL's are for using C# code within a LV program, that's not what you're doing.
Actually DLLs are strictly speaking normally shared libraries exporting standard C functions. They get interfaced with the Call Library Node. .Net libraries (written in C#, VB or whatever) are normally called assemblies, although the are usually packaged in a file with a DLL extension, but they are VERY different from normal shared libraries.To access .Net assemblies you use the .Net Nodes in LabVIEW. In LabVIEW you can create normal DLLs or .Net assemblies from VIs.
It's probably possible with some involved magic to write normal DLLs in C# but most likely a pain in the ass and a quite useless exercise. And if you want to call a normal DLL from C# you have to use unmanaged interface, which is also a pain in the ass, since you have to worry about the same things as when you use the Call Library Node to interface to a DLL.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Running Multisim with Labview

Hey,
I am trying to convert a series of student labs for a dynamic systems course to run on a newer, better setup. Previously, the lab I am working on took input from a sensor, fed that input through an analog circuit, and fed the output from that circuit into a Labview VI. My question is, can that be done using a Multisim simulation instead of a physical circuit? I have found volumes regarding running Labview VIs in Multisim, but nothing regarding a VI taking input from a Multisim circuit. If this can be done, what configuration would you suggest?

bjw5,
It is likely due to the fact that some of the vi.lib or DAQ driver libraries that you need to link into the VI are missing in the build of your Multisim LabVIEW .llb.   If Multisim cannot locate missing subVIs (from vi.lib or elsewhere) Multisim will not load the LabVIEW VIs that you have built.   Sometimes you need to include these vi.lib subVIs (usually contained in a LabVIEW library - lvlib) in the project build (by default all vi.lib functions are excluded).   When Multisim loads, it loads in the appropriate base level LabVIEW functionality only - this includes most LabVIEW functions, basic math, etc - however any advanced measurments or additional toolkits or drivers need to be included in the .llb build or the support folder directly.
How do you know? In your LabVIEW project, if you click on the 'Dependencies' +/- twisty you will see any subVIs or .lvlibs which contain subVIs that may be used in your Multisim VI application ...
Here is a sampling of a recent project that I used that included some advanced measurement VIs in LabVIEW.   I believe the only ones included by default in Multisim are the 'Base' lvlibs (which does include most of the LV functionality, but for my application advanced measurements were needed).
If you DO have any that say 'Pro' in the name or any hardware driver level functions or subVIs, you'll need to do one of two things:
1. Easiest method - Include all vi.libs in the Source Distribution under 'Additional Preferences'
Basically change this ....
to this...
Note that it will take some additional time to build (since when LabVIEW builds your llb it will search all of the lvlibs for VIs that it thinks are in your application and then remove the ones that are not)... but your VI should then run in Multisim...
2.   Advanced method -> explicitly add the subVIs or lvlibs to the top level project and make them 'always included' in the Source Distribution 'Source Files' options.
Here you can explicitely call the lvlibs to be included in your build and then take out functions you don't need (but you may not know what subVIs are used if they are embedded in lvlibs that you're not aware you are using (such as the case with Express VIs) ).   You also have to be careful since I have found out the hard way that menus within the lvlibs cannot be included in .llbs, so you have to exclude any menus folders within the lvlibs (you can include/exclude pieces of lvlibs by the way)...   Sometimes this can reduce the build time, but it can be a little trickier since you need to know which things to include/exclude.   If you are just beginning, use method #1 at first.
Ok thats they way it is with most Multisim VIs that I am familiar with but there may be some things that I am missing because you are using myDAQ...   I've requested that someone familiar with the myDAQ products on the academic team also reply to this thread.
Hope this helps and good luck!
Regards,
Pat Noonan

MultiSim configuration management

Hi,
In attempting to add some basic configuration management to my MultiSim circuits, I've found there are no built-in SCM tools or interfaces to 3rd party tools. The .ms10 files are binary and can become quite large, especially if you save simulation data in your circuit files, which makes use of typical SCM tools (Subversion, CVS, Git, etc) not an ideal choice.
Besides zipping the entire directory structure, what tools are the rest of the community using for SCM?
-J

Although we don't have a direct integration with other 3rd party system configuration/mgt tools, there are several things that you can do in Multiism that give users a basic level of configuration management...
1. Multisim Project.
a. User can use the project concept to keep track of schematic files, PCB files and other associated information such as PDFs or simulation results.   When you start a project (File -> New Project) you choose a main location and a backup directory location (they can be the same).   Files of any type can be added.
b. Users have the ability to lock files and create archived versions of that project (a unique system ID is created) - these can be used to take a snapshot of the design as is in the system.
2. Alternative method using source control tools?
a. While it is true that the files are binary, some users have kept track of and verified changes to Multisim files by exporting netlists, BOM and SPICE reports - which are all text files.   Think of the SPICE code as the source code for your circuit simulation.
b. Export the SPICE code for a circuit simulation by exporting the netlist... (Transfer -> Export Netlist).   You can also export the Bill of Material report (BOM) and netlist report by going to the appropriate menu item under Reports.
c. It is relatively easy to then track changes to the design with third party tools using these export text files.
Regards,
Patrick Noonan
Business Development Manager
National Instruments - Electronics Workbench Group
50 Market St. 1-A
S. Portland, ME 04106
Email: [email protected]
Tel. (207) 892-9130
Fax. (207) 892-9508

Multisim dc motor speed controller skematic

Where would I find schematics for a brushless dc motor speed controller to put into a Multisim circuit schematic?

Hi Mikki1295,
If you go to place->component, select Electro_Mechanical in the drop-down box in Group, then in the Family select MACHIENES, find the one you want in the component menu on the right. Same way for choosing the controller. Hope that helps.
Regards,
Derek Z.
National Instruments

PXI-2570 switch capacitance

I am generating a 5V peak, 400 kHz signal from an ARB (NI 5401) and inputting it into an amplfier with a gain of about 2, current draw around 400mA and an input voltage of 13V. I am taking the output of that amplifier and going straight into the PXI-2570 relay switches. From NO-1 and NO-2 I run the cable directly to DUT and get a ~2.5V peak-peak signal in which i should be getting a 10V peak-peak signal. If I take the output of the amplifier and without putting it through the relays I run it directly to the DUT i get the 10V peak-peak.
My Question is why when i generate the 5V peak, 400 kHz signal and run it through the PXI-2570 and attach to the DUT do I see the large decrease in peak to peak voltage? Is there some internal capacitance of the relays that would be causing such a drop? The spec for PXI-2570 seems to be able to handle a 400 kHz signal?

Murphyky,
There’s one more test I’d like you to do with your setup. Connect the signal from your amplifier, through the switch (modeled as 1 Ohm resistors), and then to a large load (not connected to your DUT). If the signal shows up without attenuation, then we can confirm that the switch itself is working correctly.
Switches have a resistance listed in the specifications manual. It is small, but it should still be considered in your design. You’ve basically built a voltage divider with your circuit.
A colleague of mine simulated your DUT in our Multisim circuit design software to see if we could determine the exact source of the signal attenuation in your DUT. What sort of load are the two transformers driving? We found that we could get a wide range of voltages across the DUT just by altering the load attached to the transformers. See the images I’ve attached for reference:
With the transformers driving 2 Megaohm loads:
With one load reduced to 100 Ohms:
Do you know the specifications of the amplifier that you're using? Is it possible that it can't source the power required to drive the DUT.
Let me know how the test with the switch goes. If it passes, there is some other limitation in the circuit that is causing the signal attenuation.
Good luck with everything.
Regards,
Jared R.
Precision DC Product Support Engineer
National Instruments

Design Rule Check Error

I have a component in my Multisim layout that has a package MINISOIC-10(MUB10A). It is for the audio amplifier LM4667MM. When the Multisim circuit is transferred to Ultiboard and the autoroute option is used it gives the error that nets are too close together. When finding these nets I find that it does not like how close the pins are from the component and therefore cannont find a route for the trace. I know this is the correct package so how do I get Ultiboard to realize the spacing between the nets for the pins cannot be changed.

Hi Hallee,
There is not much you can do about the pin locations and often sizes, if the pin default settings resulted in DRC errors where pins are too close, I would just set all pin clearances to 0, you can rely on the net settings for DRC check. You can double click on a pin and a pin properties dialog box should appear, under the "General" tab you can change the pins clearance. If you select all the pins, when you change one pin the other will change as well.
Tien P.
National Instruments

Transient analysis frequency estimate

Hi,
I have a simple analog tone generator that produces a sine wave after some short startup delay. Is there a function in Multisim that would allow me to take my transient analysis data and estimate the frequency of oscillation? What I'm looking for is similar to the frequency counter available in the runtime tools.
Specifically, I need to generate a table of results from a Monte carlo transient analysis. Currently, I'm forced to export the 200 or so MC time series and perform an FFT in MATLAB on each series.
I'm not looking for a monte carlo Fourier analysis, because I need much better resolution than this tool provides. Is there something I can do with the post processor to extract a frequency estimate?
-J

Hi Jay,
In Multisim, you can use the probe or frequency counter to read signal frequency, but once you use any of the analysis such as transient, the option to find frequency is not available.
What you can do is use LabVIEW to control Multisim and there is a pre-built function available that can calculate a signal frequency. To make this work, you need LabVIEW and the LabVIEW Multisim API Toolkit which can be downloaded from the links below:
https://lumen.ni.com/nicif/us/evalmultisimtlkt/content.xhtml
https://lumen.ni.com/nicif/us/evaltlktembdes/content.xhtml
Once you install the required software, in LabVIEW you can create a VI (a program) to launch Multisim, run a circuit 200 times and each time change component values and calculate the output frequency for each run.
Attached is a sample circuit and the VI I created. Double click on the Reading Signal Frequency.vi file, click on the folder in the front panel (the screen with the grey background) and select and select the Multisim circuit which is attached. In this program, I am changing a resistor R1 in the Multisim circuit and run the simulation 10 times, once finished, the result will appear in the array in the front panel.
You can use this example and modify the VI for your circuit.
Tien P.
National Instruments
Attachments:
PhaseShiftOscillator_a.ms12 ‏98 KB
Reading signal Frequency.vi ‏69 KB

LabVIEW LVM voltage

I made a LVM file which was made by LabVIEW8.20.
I tied to use the LVM file from LabVIEW LVM voltage
But error was occured "Error:No nodes present in circuit. simulation aborted".
What is a problem with that?

It may help if you posted your circuit for us to look at. That way we can give it a proper going over and provide you with a correct solution. Also post your Labview file because I am not sure that this file would be transfered with the Multisim circuit file.Message Edited by lacy on 11-01-2007 07:19 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

Voltage squarer using the AD633JN

hello there i am trying to implement a voltage squarer using the AD633JN IC, i have first tried simulating it in multisim. well its transfer function is
W = [ {(X1-X2)(Y1-Y2)} / 10V] + Z.
Given this transfer function, squaring can easily be achieved by making X1 equal to Y1 and making X2 and Y2 equal to zero. This is done by connecting X1 and Y1 to the same input voltage (E) and grounding X2 and Y2. This is basically the same as connecting the X and Y inputs in parallel with each other.
The over-all transfer function of this circuit is as follows: W = (E squared) /(10 V).
Well i have looked at the data sheet of the AD633JN, and in it they describe how to change the scalar to something else using two resistors.i want the transfer function to be W = E squared , hence implementing the squaring function .so i want to remove the "10" in the denominator but iv failed...some one to help...Thank you so much.
attached is the datasheet (check under the ""variable scale factor"" section on page 8) and my multisim circuit.

Hi,
I do not see the attachments. Can you please attach the files again.
Regards,
Tayyab R,
National Instruments.

Explanation of a MULTISIM circuit

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