Hi, I'm wondering if anyone has a LabView driver for a Shimadzu UV-1800 spectrophotometer. Thanks!
↧
Shimadzu UV-1800 driver
↧
How to implement this "simple" algorithm?
Hello.
I'm attempting to understand the logical algorithm Labview uses to convert relative time to dbl. I know that absolute time is converted by the number of seconds elapsed passed epoch - is relative time the number of seconds, or miliseconds, or something else?
I'm attempting to control the visible time period on a waveform chart, so I want to make sure I understand how Labview handles timestamps.
↧
↧
HMI
interfaz HMI para supervisor y controlar el estado de las luces, puertas y grifos de agua. La interfaz debe ser diseñada siguiendo las recomendaciones vistas en clase. Incluir contadores de tiempo que corran cuando las luces estan encendidas y mostrar un diagrama de tendencia que indique el consumo, asumiendo que cada bombillo consume 100Watt por hora.
¿mi pregunta es como hago el diagrama de tendencia?
agradezcomucho su colaboracion amigos.
↧
PARALLEL PROCESS
I NEED TO GENERATE RANDOM NUMBERS AT A DETERMINED FREQUENCY
WITHIN THE CONFIGURED TIME.
FOR EXAMPLE MY CONFIGURED TIME IS 30 SECONDS AND
I WANT TO GENERATE RANDOM NUMBERS EVERY 400 mS,
AND THESE RANDOM NUMBERS PUT INSIDE AN ARRAY
↧
Boolean Program Stop
Hello I want to stop a running graph so that the loop stops either if the stop button is pressed or if the current temperature is within 0.4 degrees of the average temperature from the 2nd and 4th previous readings. The Temperature Monitor VI acquires and displays temperature and averages the last five temperature measurements and display the running average on the waveform chart. I know this might be super simple but I can not wrap my head around how I should go about this. Thank you.
↧
↧
Re: I am a student and I am looking for a driver for the Instech Pump P720.
Hi,
I also need to make thermsitor measurement. Could you successfully use NI 9205 for this purpose? If yes, then how?
↧
traditional ni-daq windows 7
Hi team
I am new to LabVIEW.i want know about how to crate traditional NI-DAQ(Lagacy)devices in NI max. Now I am using windows 7 PC. pls ref attachment for reference
thanks and regards
Mohan
↧
Read a data from excel - report generation
Hello all ,
i have an attached a VI . which Consists of several rows and several columns. Particularly in a 3rd column ( Test time ) is not reading properly in LabVIEW indicator. i was tried in many ways ( extract a column and adding a colon ). what was the reason ?? how to crack this ?
↧
Control ActiveX/Excel plot legent number of plots
Hello,
I am trying to familiarize myself with ActiveX & excel and I am using a vi (attached) that I found online. and when I run it excel opens up and in the graph the plot legend has 7 plots listed instead of 1. How can I change this to go according to the number of plots I actually have?
Thank you in advance
↧
↧
Timed Loop in LabView RT cRIO
Dear all,
I have a setup the period of timed loop to be 2000 microseconds, however, when I calculate the loop time using tick count (in milliseconds), it is different than the period. The period still shows me 20 ms, but the loop time indicate 10 ms. Is the period in timed loop different than the actual loop time, if yes, then what is the difference. If not, then what can be the reason behind this?
Regards,
Noor
↧
letter to graph points
hello, i am doing project and i wanted to place the letter in xy graph and wanted all the set of coordinates where the dark there,i have uploaded some example images,please can any one suggest me how to do in labview and provide the site link
↧
Array Cluster of booleans
How do I make the Boolean buttons act like a radio button in this Cluster array.
If the user clicks on one of the buttons I want all other buttons to be false.
Is this the right control to use of is there something better.
I am trying to make a list of tests and the user will click on the Boolean to run the desired test.
↧
ULx driver - "null" as a Dependency
I installed the ULx driver from MCC Measurement Computing.
The driver gets installed in LabVIEW's vi.lib directory.
I don't understand why I am getting a null entry in the test program project.
How do I fix this warning? I am wondering whether this has something to do with the ULx driver being previously installed to LabVIEW's instr.lib directory in earlier versions of the driver.
There are no broken VIs.
↧
↧
How to determine the size and position of a subpanel
Hi,
I want to load a sub-vi to a subpanel. However in the sub-Panel I want the only thing to be visible a graph in the subvi. I know I can set Sub Panel height and width but it still leaves me the scrollbar and does not initially show the graph only. How could I solve this?
Regards
↧
Error 1003 from Open VI Reference in executable on Windows 10
Hi,
I have searched the forums and found several topics relating to this error however I have not found a solution for my problem which seems to be different to any I could find.
I have a large executable that is built in LabVIEW 2011 and works perfectly on Windows 7.
On Windows 10 I get the Error 1003, a screenshot of the error is attached. I have also a snip of the VI where the error occurs. It occurs in a Launcher VI which is trying to call the main vi, Eval.vi, when the error occurs.
The main vi is "Always Included" in the application. And works perfectly on Windows 7 so is there something about how Windows 10 uses relative paths that could be affecting it?
Any help would be much appreciated.
Regards,
Cathal.
↧
How to set the position of the XYGraph elements programmatically
Hello,
I am looking for a possibility to set the position of different elements of an XYGraph programmatically. I could find the positions (to set) for the plot area, the axes (X and Y Scale), and the Plot Legend, but not of for the Graph Palette, the X Scrollbar, the Scale Legend, and the Cursor Legend (LabVIEW 2013 SP1).
↧
Measuring Time Between Pulses
Problem: Measurement of time between photon arrivals.
Hardware/Software: Hamamatsu PMT, NI 6612 Counter/Timer, LabView 2015
I am attempting to measure the time elapsed between subsequent photon arrivals to my Hamamatsu PMT. Previously, I have connected the PMT to the NI 6612 counter/timer, and written a program to count the number of photons incident on the PMT, and then back-calculate to find the photon arrival times. That program had a few issues with sampling time / frequency, so that I was unable to acquire data about photon arrival times. I was advised to measure the time between the pulses, so that there would be less data to acquire. I am looking for a way to acquire a data array of time durations between incident photons.
So far I have three ideas on how to do this:
- Use a rising edge on the first counter(signifying the arrival of a photon) to trigger another counter to start counting ticks. The next rising edge would reset the counter to 0, and it would begin counting ticks again. I was unable to figure out how to use the first counter as a trigger, and therefore input the number of ticks from the second counter into an array.
- Use pulse-width or semi-period measurements. As I understand it, pulse width only measures the time that the signal is high, and I would be unable to measure the total time until the next rising edge. Additionally, my pulses would not be coming with regular frequency, so I do not know if a period measurement would be appropriate.
- Write a variation on the "two-signal edge separation task". This task looks perfect for what I wish to do, except that my signal is coming in on only one line.
I am very new at LabVIEW, and have spent a lot of time reading through the forums, but must admit that I didn't understand many of the problems/solutions that were similar in nature to mine. I hope that my question is clear. Thanks for any help in advance.
↧
↧
How to generate an ideal sine wave from an inputted sine wave?
I have a sine wave that is being inputted, and would like to generate a perfect sine wave that match the inputted sine wave, and then be able to compare them. I'm having an issue getting the frequency correct on the generated signal. The inputted signal is not time based, but rather sample based. It takes a total of 8192 samples, over a full 360 degree revolution, and have anywhere from 2 cycles up to 128 cycles over that time. My initial thought was to do : Average_amplitude*Sine((360/8192)+x)) where x starts at 0. Having that run for 8192 loops gives me a created signal with a frequency that is too high. I've been playing around with this and trying all kinds of combinations I can think of, but can't just can't get the right combo.
↧
Labview crashing during execution, after updating class properties
During debugging of an issue, labview began crashing frequently. I started to suspect a corrupt file in the project, so I reverted to a version of the project prior to these problems and started re-introducing the changes in smaller increments, and narrowed down the problem to the re-ordering of the controls in a class definition.
The class in question is an Actor class. If I run a version of the project just before this problem started, everything executes without problems. I then open that actor’s property cluster, re-order the controls, close the property cluster and save all – that is the only change. Do Ctrl-L, and now dozens of VIs are shown as broken (but not cause of breakage listed). Close labview and re-open the project and no more broken VIs. Run the project and everything is fine, until an instance of this Actor is run, then Labview crashes. I don’t even get the usual pop up that tell me Labview is going to shutdown and asks me if I want to tell NI about the crash. All Labview windows just suddenly disappear. Sometime when re-starting LV, I get a pop up about an ‘internal warning’ that occurred the last time LV ran.
We have tried numerous ideas to resolve, including opening the class independently from the project and re-saving (as suggested in another post), re-compiling, and checking all bundle and unbundle by name functions to ensure nothing got messed up during the re-order (as has happened to me in the past).
Now resorting to rebuilding this class, but this is a huge class could be many days of work. Any other ideas out there to re-pair this class?
↧
FPGA Target is missing after Installing LV 2017
I recently upgraded from LV 2010 to LV 2017. Since doing so, the FPGA target is missing from my project, as shown in this screen shot (left). Further, if I try to add a new FPGA target (right-click on the project, and select New / Add Targets or devices), my installed FPGA isn't listed (as shown on the right).
My board is a PCIe-7842R. It is recognized and registered with NI. I installed the R-series multifunction drivers, and this board IS supported by the current version of LV according to this page: http://www.ni.com/product-documentation/10622/en/
Any thoughts on what I'm doing wrong with my installation?
↧