Record data taken by NI ELVIS impedance analyzer

I need to display data taken by the impedance analyzer VI (magnitude and phase which are used to find resistance and reactance) in chart form in a given time interval (in addition to the polar graphic displayed currently). Also, when the program is terminated, the data should be saved to a spreadsheet. I am having trouble recording each variable in a separate column in both the spreadsheet and the chart. Apparently they need to be separate channels.

So, are you just needing a "log" option within the impedance analyzer? If so, then I would suggest to modify the impedance analyzer source code to write the data to a spreadsheet file.
The source code VI for the impedance analyzer can be found within the ...\Program Files\National Instruments\NI ELVIS 1.0\Source Code\Impedance Analyzer directory. You could add the Write to Spreadsheet File VI to the program to create a VI that would log the data to a spreadsheet file.
I hope this helps.
Regards,
Todd D.
NI Applications Engineer

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How to use IMPEDANCE ANALYZER to measure input $ output impedance of BJT circuit

Am currently doing experiments by using NI ELVIS IMPEDANCE ANALYZER but am now suffering a problem on how I can connect it so as to measure input and output impedance of a BJT circuit.
My circuit is as shown in my attachment.
Attachments:
ni.docx ‏46 KB

I see that you already posted on another thread. Please refer to it here:
http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/HOW-TO-USE-ELVIS-IMPEDANCE-ANALYZER-TO-MEASUR...
Regards,
Nathan S.
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Impedance Analyzer Sweep Getting Interrupted

Hi Everyone,
I am working on a LabView program for an impedance analyzer which finds a peak and records data around the frequency the peak is located at. While collecting data about a certain peak it is also designed to continue tracking that peak because the peak is not constant.
This program works in LabView Version 7, but this is not the case in Version 8.5. In 8.5, it looks like that the program begins sweeping (the little cursor on the display begins moving across the display) but gets interrupted and stops sweeping. This does not prevent the program from recording data - data is definitely being recorded. However, what this prevents us from doing is tracking the peak; eventually, the peak drifts off the span of the impedance analyzer and any data we collect is useless.Something I've noticed is that if I put LabView in "highlight execution" mode, the program works perfectly fine - no more interruptions! I'm not sure what is interrupting the sweep in normal mode - I'm relatively new to
LabView and attempted to use a WAITSRQ VI to remove any interruptions,
but this just ends up timing out.
While I have attempted tackling the problem from a programming point of view, the fact that this program works in version 7 but not 8.5 seems to indicate that it might not be a programming issue but rather something with the versions.
I have attached two files that may be helpful for anyone that looks at the problem. Mainly the problem is occuring when the control goes to the "Agilent4294APeakTracker_twochannel" file.The main file is the 4395A_no_curve_fit.vi file. If you have any questions about the program or anything I've been unclear about, please feel free to ask!
Thank you for your help!
Matt
Attachments:
4395A_no_curve_fit.vi ‏81 KB
Agilent4294APeakTracker_twochannel.vi ‏38 KB

Remember that this is all for your own good. I am surprised this program ever worked correctly. Dataflow, dataflow, dataflow. The sequence structures you are using perform no function. There is no coordination between your sub-vi and the main VI. Your are sending commands from both VI's with no flow of the timing. Review dataflow programming and clean up the VI, then you will be able to troubleshoot.

How can I record data from 2 devices synchronously

Hi,
I've been working on this VI for some time now and I've already recieved some prior help from these forums, so I hope I can get this problem solved.
I have a DAQpad 6020e, a hot wire thermo anemometer, and Labview 7.1. I need to take voltage measurements from the DAQpad at a scan rate I specify (I have it set to 1000 in the screenshot), while simultaneously taking readings from the anemometer. However, the anemometer only takes readings every 1.6 seconds, which it sends to the serial port in ASCII.
I have tried many iterations of this vi to try to get the data to come out synchronously. By synchronously, I just mean I want both measurements to START at the EXACT same time. Obvisously the scan rates are drastically different so I will have far more measurements from the DAQpad, but that is ok so long as both measurements start at the same time. I cannot control when the anemometer makes its reading, so what I have attempted to do is as follows:
1. VI starts, both reads initialize, then DAQpad scan begins.
2. If Scan Rate and "Scans to read" are equal, it takes one second for measurements to start being recorded from the DAQpad.
3. In an attempt to synchronize the measurements, I attempted to tell the anemometer WHILE loop (serial) to wait until the first measurement has been recorded from the DAQpad. (**Note, I have also tried using the "number read" lead off of the AI read command).
4. Because I only get 1 reading from my anemometer per 1.6 seconds, I can't predict when the next reading will be. But I want my measurements to be corrolated in time, so I have attempted to start the measurement file as soon as the case structure starts. This way, even if the very first reading is invalid, the rest of the readings will be valid and will be taken at times that directly correlate with the DAQpad measurements.
I have run this vi many times, with different results. I have gotten it to run sucessfully many times, meaning that both measurement files started recording data at the exact same instant, even if the anemometer reading wasn't available yet (I know this because the second measurement was taken at a time earlier than 1.6 seconds, meaning that the file did not wait for a measurement to be obtained in order to assign a value at 0 time). HOWEVER, other times, this vi does not run correctly. Sometimes the anemometer readings begin before the DAQpad readings, sometimes after. In every case where the vi does not work, it appears that the anemometer measurement has waited for its first measurement to be recorded at time 0 instead of starting the measurement file when the DAQpad starts.
I need to know why this vi doesn't run consistently. I can see it do what I want it to do over and over again, but I can't use this vi if it is not 100% consistent.
Thank you,
Jake
Attachments:
LabVIEW Synchronization Attempt.pdf ‏78 KB

For future reference, just post the actual VI. It is easier to troubleshoot than a print as a PDF.
Given the software complexities of separate threads and serial bus versus PCI bus, I don't see how you can say that the measurements actually start at the same time. The only way you can say that the measurements started together was if you were using a hardware trigger.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Why doesn't Lightroom organise videos/photos lacking "date taken" by "date modified" instead of "date created"?

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Recording data at particular iterations and writing to text file

Hi all,
this is my first time posting on the NI boards. I'm running into a couple problems I can't seem to figure out how to fix.
I'm collecting data using a LabJack U3-HV daq. I've taken one of the out-of-the-box streaming functions that comes with the LabJack and modified it for my purposes. I am attempting to simply save the recorded data to a text file in columns, one for each of my 4 analog strain gauge inputs, and one for time. For some reason when the 'write to measurement file.vi' executes it is puts everything in rows, and the data is unintelligible.
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Attachments:
3.5LCP strain gages v2.vi ‏66 KB

Hey carfreak,
I've attached a screenshot that shows three different ways of trying to keep track of incrementing data and/or time in a while loop. The top loop just shows a program that demonstrates how shift registers can be used to transfer data between loops. This code just writes the iteration value to the array using the Build Array function.
The first loop counts iterations in an extremely round-about way... the second shows that really you can just build the array directly using the iteration count (the blue "i" in the while loop is just an iteration counter).
The final loop shows how you can use a time stamp to actually keep track of the relative time when a loop executes.
Please note that these three should not actually be implemented together in one VI. I just built them in one BD for simplicity's sake for the screenshot. As described above, the producer-consumer architecture should be used when running parallel loops.
Does that answer your question?
Chris G
Applications Engineer
National Instruments
Attachments:
While Loops and Iterations.JPG ‏83 KB

Does digital output conflict with impedance analyzer

I am running one program that produces three digital outputs on DO [0..2] and I am also trying to run the Impedance analyzer at the same time. I get this error message:
Error -200429 occurred at DAQmx Write (Digital 1D Bool 1Chan 1Samp).vi:1
Possible
reason(s):
Value passed to the Task/Channels In control is an
empty string (or I/O control).
The value must refer to a valid
task or valid channels.
I'm not sure what this means, but does it have anything to do with a conflict in hardware when running digital outputs and impedance analyzer?
Any help would be great, I am relatively new at LabVIEW/ELVIS.
Thanks in advance
-Shane

Shane,
It sounds to be more a referencing issue than an issue between the DIO and impedance analyzer. Sounds like it may not be calling to the correct channel.
Heres some troubleshooting steps:
Can you communicate with the ELVIS board in Measurement and Automation Explorer (MAX)?
If so, can you use one of our example files to try to do some DIO?
If that works, try to comment out the impedance analyzer step to make sure it isn't causing the issue. You can comment things out by using the diagram disable structure, which is under programming->structures.
Regards,
Kyle Mozdzyn
Applications Engineering
National Instruments
Regards,
Kyle M.
Applications Engineering
National Instruments

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For clarifications on various date time tags, please refer to: http://forums.adobe.com/message/4879588
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Using a waveform graph, how to get all recorded data graphed?

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I am attaching the two VIs I have been trying to use. I started with examples from NI and didn't go far from that. Any assistance would be appreciated.
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Measure and Record Six Voltages with Express1.vi ‏119 KB
Graph Measurement Files1.vi ‏89 KB

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Record data taken by NI ELVIS impedance analyzer

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