Controlling Kistler Quattro Jump Force Plate

Hi everyone,
Our lab recently acquired a Kistler Quattro Jump force plate (model #9290AD). Supposedly a great plate, but so far I've been unable to set up any sort of communication with it. From a company software side, they don't yet support Windows 7, and lo and behold, all of our computers run Windows 7. "No big deal, I can use LabView," I told myself. In the long run, this would be the better option anyway, as we can integrate accelerometers, potentiometers, etc. if/when we receive more funding. We don't currently have a DAQ system so that sort of integration is a long way off, but the plate has its own amplifier and DAQ built in so we should be able to communicate with it. Back to this in a second.
The other issue is that the plate only has a serial port. Much the same as our Windows situation, none of our computers have serial ports, so I purchased a serial-to-USB converter from the now-defunct Cables Unlimited. I installed the necessary drivers and made sure they are up to date. The port is recognized as COM3 on my desktop and COM4 on my laptop. I attempted running VISA, and in both cases (laptop and desktop), VISA recognizes the plate is there, but I receive "(Hex 0xBFFF0015) Timeout expired before operation completed." I also tried running Instrument Assistant with similar results. I imagine the converter could be the issue in this case, but securing funds for a unit from NI is unlikely at this point in time (yay, Bureaucracy). If anyone has ideas as far as what converter I could look into (if it is the issue), I would appreciate it. If the converter isn't the issue, though...
The user manual (included in the zip) states that the Quattro Jump software sends a signal to the force plate during data collection to turn it on. I reason this could be the issue affecting my ability to connect to the plate through VISA, but that's just speculation at this point. I've attempted to compensate for this by adjusting query time and other settings, but I'm really flying in the dark.
To attack this from another angle, Kistler included a system called QJServer (also included in the zip) to allow for third-party connections to the force plate. It's great they've included it, but as my bad luck seems to be continuing, I don't understand enough about programming to utilize the information they've provided. I downloaded VC++ and poked around with the files, but they're gibberish to me. I've tried running the dll importer and Call Library Function node, but again, I don't really know what I'm looking for in terms of the correct dll/header file. I also don't know if I need to compile my own dll or include a header from the Windows SDK or what. So, I'm hoping someone can at least point me in the right direction. I've heard nada back from Kistler at this point, so any information would be extremely helpful.
As far as what I'm attempting to do on the VI side of things, we're using the plate for jump testing and isometric pull testing with our athletes. The jump collection will look very similar to the VI I've attached (likely sans Scaling and Mapping node), though a friend of mine is currently refining a more complex version that can provide us with instant feedback instead of requiring a separate analysis program.
Sorry if the post is information overload; I'm just attempting to cover all bases. Any help would be appreciated, and I'll be sure to promptly reply to any other questions you might have.
Thanks!
(As a side note, I'm unable to upload the entire Quattro Jump folder as it's about 4 MB too large; these files should contain the main information, though)
Attachments:
Documents.zip ‏548 KB
QJServer.zip ‏375 KB
RC Jump Data Collection.vi ‏205 KB

Hey, everyone, thanks for your replies. I figured as much on the QJServer side of things. I've attempted to get in contact with their regional office here in NY, but haven't heard anything back thus far. When it comes to C++/VB, I have two main issues. 1) I have no programming experience outside LabView, and 2) the examples they have don't seem to mesh well with the version of VC++ I have. I can likely work around the first issue (the examples from their BioWare software had guidelines built in, so I imagine the examples for QJS provide something similar). As far as issue 2 goes, is there another program you would recommend I check out to open the projects?
On the VI side of things, it was actually written by a friend whose lab uses NI equipment. At this point, we probably can't secure funding to purchase a DAQ system. I've used other calling nodes in hopes of finding something that will interface with the plate, but I attached the current VI to provide an example of what I'm looking to do. Once I find a way to interface with the plate, I'll be sure to edit the VI.
Thanks again!

Similar Messages

Trying to use labview to analyse analog data from a jump on a force plate and measure peak force (at two points, initial land and 2nd land from jump). Also need to mark the time of flight (time off plate).

Attached is a file of 3 trials of a drop vertical jump activity onto a force plate. the subject stands on a platform off the force plate, jumps onto the force place and immediately jumps up as if going for a rebound. I am able to run this data and obtain a waveform graph with no problems. however, I need to be able to find the initial contact with the force palte, the peak of the drop, the intial time off the force plate (prior to the jump), the return from the jump and finally the second peak (landing from the jump).
I want to calculate the time of flight ( time off the plate and in the air after the intial drop) to calculate juimp height.
I had someone write me a mathscript for it and it works well, however, I need to do it without mathscript as I do not understand mathscript (nor Labview!!).
Please help
Attachments:
Jose_Index and shift register6.vi ‏130 KB
NI post.docx ‏365 KB

OK, but I'm not understanding what you're asking us to do... Are you asking us to explain what the MathScript code is doing? (It's searching the array for the elements when the values are above or below a threshold.) Are you asking someone to convert the whole MathScript code to LabVIEW (we are not a code-writing service), or you just want to be able to calculate the new stuff you want with LabVIEW?
In the future, please do not post proprietary file formats. Most people do not have Word, or Word 2007 for that matter. Please post text files or PDFs. Thanks.

I would like to tare (rezero) the input signal from a forceplate (glorified

I would like to tare (rezero) the input signal from a forceplate (glorified scale) so that the base signal is set to zero, e.g.: a button on the front panel that resets the signal to zero prior to getting a measurement from a subject.
We calibrate the force plate through labview and input our new equation into our scaling and mapping box which sets the signal to zero (or near zero) and the change in newtons (force reading) is accurate but when the application is closed and reopened the signal does not always start at zero (-400 to +1200 N), while the change in newtons is still accurate. I am NO engineer, I have Forest Gumped my way into getting some nice working VIs but I can't seem to find this function.
Thank you very much for your time.

Maybe that is the limitation of Acquire Input Data.vi.The vi can't identify the Unformal key.
You can try to use Event structure and set to listen "key down" event.
There are two terminals VKey, ScanCode will sent out the information when you press key.
There are two pictures in attached file, 2.jpg will show you the detail.
Good luck.
Attachments:
SpecialKey.zip ‏17 KB

Time stamp for BioBench

I am acquiring EMG data with BioBench while acquiring gait data from another source simultaneously. To correlate the data, it's important that the date stamps match. I would like to know where the time stamp comes from, and if there is a way to get more precision (milliseconds instead of seconds). Also, can I get more precision when I export, since this chops it off to the nearest minute.
Thanks!

The gait data can't be acquired with BioBench since it is from a motion capture package that acquires data in a completely different way with lots of complicated analysis involved. It processes dozens of frames per second from several video cameras to find the markers etc. I want to match the movement with the EMG signal exactly, to see when the movement begins in relation to the EMG signal. Therefore, I need to know exactly at what time each point in the BioBench file takes place in order to find out how much earlier the EMG signal started than the movement. Knowing when the EMG signal started to the nearest second is not nearly good enough resolution to say anything meaningful about the time difference between the onset of the EMG signal and the movement. The
whole point of acquiring data at up to 1000 Hz is defeated if I only know the absolute time to the nearest second. For anyone who can't acquire all of their data with a DAQCard (motion capture, force plate, etc), the data can't be correlated if the creation time isn't accurate and precise, which really makes BioBench useless for data acquisition or analysis.
Is there anyway to get the creation time to a better resolution? And does the creation time correspond exactly to the first point in the data? I think this would be a necessary improvement for many users.

Getting only 1 peak value per cycle

Hi,
I am studying hopping, and my subjects hop on a force plate at 2.2Hz for 30 seconds. I am attempting to output one peak ground reaction force for each hop in a bar chart, but my program is running so quickly that I get multiple peaks for each hop (see attached .png file). I have added conditionals to try to eliminate the extra peaks, but they only seem to be getting rid of the unnecessary peaks that occur before the actual peak. I've also tried to used a timed loop instead of a while loop, which sometimes removes the extra peaks, but not consistently. Does any one have other ideas about getting a single peak for each hop. Thanks.
Solved!
Go to Solution.
Attachments:
Hoptest_output.png ‏586 KB
HopTest_MLE_BPS111.vi ‏31 KB

Hi bp,
you probably tried to find pulses at the wire going into that "Peak" chart. You can't search for pulses on a scalar value...
When you tried that on your waveform (directly after DAQmxRead): how many samples do you read per DAQmx call? How many values are in your waveform?
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Low pass filter help

Hi all,
I'm trying to read in a channel, filter the noise out (supposedly the noise is about 10Hz), and then provide visual feedback for forces. Without the filter, everything works as it's supposed to, with the connection being between the data output of the DAQmx read and the input of the array. But when I add the filter, I get the error: Analysis: The following conditions must be met: 0 < f_low <= f_high <= fs/2. I'm not sure why I am getting this error and why it stops my feedback from occurring. I also have a version with a "nonexpress" filter but my feedback isn't working on this version either. both are attached!
Thank you!
Attachments:
expressfilterAIM2.vi ‏103 KB
nonexpressfilterAIM2.vi ‏55 KB

We still have an issue going on. To further explain the program, the program displays peak ground reaction force (GRF) on a chart of someone hopping on a force plate. The program finds the peak GRF by using shift registers, essentially it displays force only when the GRF at the i-1 iteration is greater than GRF at both the previous and next iteration (Aim2Hop2014_v4run.vi). This works until we add a filter (Aim2Hop2014_filt_test.vi). We're not sure what the problem could be, but the case structure is always false for Aim2Hop2014_filt_test.vi, when we didn't have this problem for Aim2Hop2014_v4run.vi. The problem seems to be some lack of compatibility between the case structure and the data coming out of the filter. Does anyone have any ideas about how we can fix this?
Thank you!
Attachments:
AIM2Hop2014_filt_test.vi ‏53 KB
AIM2Hop2014_v4run.vi ‏46 KB

Running two different VI codes simultaneously

Hello guys
I am conducting a study in which I am required to run multiple codes for different harwares simultaneously, I have the vi codes for them, I am looking for suggestions on how I can integrate them in such a way that all of them run simultaneously, can I use "Sync" option provided in the pallate.
Please suggest
Thanks in advance
Best
Deependra
P.S- All the hardwares are independent and I am not using any chassis to sync them externally, I only need to integrate the vi codes

Are you just reading from the EMG and force plate?
I'm not hearing anything that says you need absolute synchronization. So I would just run them as two separate subVIs. You will want to get away from the example and use the actual driver VIs. If they both are just reading, them put then in the same loop. Read the EMG then read the force plate. Do whatever with the data and loop through it again. This usually works well as a Queued Message Handler.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to release and read another external file

My vi is set to read an external file (a previously collected force plate signal), then perform a string of analyses on it and finally save the analytical output. Currently, "Read from measurement file" is outside the while loop containing all of my analysis.
Without completely restarting the vi, I would like to be able to release the file and load another. How might I do this?
Thanks!

I would do several things to clean up the block diagram.
whenever you have multiple outputs that are related to each other (PF, F100, F150, F200, F250, etc...) or all of the RFDs and Impulses, you can bundle them together and then display them with one big cluster, or as an array, if that makes sense. This will reduce your total number of outputs and maybe improve organizaiton.
If you have a seqeunce of functions that go together, you can combine them into a SubVI to save blockdiagram space and making things more logical.
If you have several places where the same sort of function is being done, (for example, you have Extract-Statistics-Formula several times and Extract-Integral-Statisics several times) you can make this into a sub-VI and then loop through it. That way you can execute the function multiple times (with slight changes on each loop), but you only have to have the code written once. It also makes it much easier to improve the code because you only have to make one change instead of four.
The attached VI shows two ways of doing something. On the left is your code, which is four sets of the same thing. On the right, I've taken this code and put it into a loop so it does the same thing four times.
Attachments:
Simplified Code.vi ‏896 KB

Gait data: step count and average waveform

I am currently evaluating DIAdem to determine if it will be usable for my task. I have human gait force/moment data to analyze. In particular, I am analyzing force data similar to force plate data. Data is anticipated to be collected over periods of days so they will be relatively large files. First, I need to segment the data according to activity (inactive, standing, walking, localized movement). I have figured out how to do this manually using flags and visual inspection. If I go forward with the software, I will want to automate this process but my current questions are regarding the analysis of the segmented data.
(1)    For the walking and localized movement segments, I want to know the number (count) of gait steps. One complete step is illustrated in the pdf between the two black solid lines. The gait movement typically has a double peak appearance but that is not always the case, sometimes it resembles a single peak. The peak search does not necessary give me what I want.
(2)    For the walking segment, I want an average gait step waveform. Take all the individual steps and display an average waveform (one complete step).
(3)    For each activity segment, I want to know the total duration for the activity. The sampling rate is not necessary constant and might fluctuate or change. Since the segmented time data references the relative time location, I haven’t been able to figure out how to represent the total time especially since the sample rate changes.
I have attached a sample of the data which includes the complete force data and manually segmented activity data. I am not experienced with VBscript writing. Suggestions/assistance with any of these tasks will be helpful or indication if any of these tasks are not feasible with DIAdem.
Thanks
Attachments:
Gait Waveform.pdf ‏39 KB
Trial Data.zip ‏1189 KB

Hi MJG3,
What you are trying to do is definitely possible with DIAdem and while it is a lot easier than it would be in other languages, it isn't necessarily simple - especially if you don't have much experience with VBscripting. I took a look at the data that you attached and you will definitely need to create an algorithm to filter out each different section of your data to create separate graphs. In order to actually create these graphs, it is probably easier to record a macro in the Scripting tab that creates a subset of data and then adds it to your report (or wherever you need it) than to write it from scratch. Then, from there, I would use the algorithm you develop to determine where to put each data point.
As far as the actual algorithm goes, I have a general idea of how you might want to do this. You could use a 'filter' (if/else if) statements that look at the following parameters to determine whether you are walking, standing, localized, or inactive.
If you are walking, it looks like you could use the frequency and amplitude of your signal to determine if you are walking (If Frequency > limit && Amp > limit2)
Next, I would check to see if you are standing by determining if the change in amplitude over a certain period of time is less than a certain amount but the amplitude is greater than a set limit. I might suggest using an offset of your localized data followed by an integral to get the area under the curve to determine the change.
To determine if you are 'inactive', I would use the same parameters as standing but you would want to look below the set limit.
Finally, any data that is not accounted for is 'localized' which appears to be more random than the other three data sets.
Of course, to do all of this you will need to take subsets of your data and scan each section x points at a time. The number of points to look at is going to vary based on the rate that you are acquiring data, how fast you expect your subjects to walk, etc. I would use something similar to this example in order to count the number of peaks from walking which would tell you the number of steps.
I wish you the best of luck on your project!
Regards,
Trey C.

1D Array for Data to buffer

I have a force plate that sends out forces in the x,y,z and i need to be able to index them into a 1D array for a buffer. I think i have the ground work of the program laid out but im not sure where to go from here. See attached program. Thanks for any possible help.
Attachments:
Buffer.vi ‏20 KB

Your VI will run forever because you have a False constant wired to the stop terminal of the loop.
Why do you have a while loop in there anyway?
You don't have any element going into your replace array subset. So you have a broken arrow.
I don't understand the meaning of your buffer full boolean. It really isn't telling whether your buffer is full or not. It doesn't even track how many times you've replaced various elements in the array. It just checks whether the value you used for index is a multiple of your buffer size. Let's say yor buffer size is 10. If you use an index 9, the remainder of 9 mod 10 is 9, it's not equal to 0, so the boolean is false. Okay.
Now if your index is 10, 10 mod 10 is 0, it's equal to 0, so the boolean is true. Okay.
Now if your index is 11 (obviously bigger than 10) 11 mod 10 is 1. It's not equal to 0, so the boolean is back to false. But is seems like you really intend for it to be true.
You aren't really ever checking if your array is "full". You are just comparing your entered index to your "buffer size" input, which may not actually have anything to do with the size of the array.

Motion capture camera

Hello Guys
My name is Deependra, I am new to the software lab view and I am trying to understand it, I work at a lab at the UM Dbn campus and here we' re trying to conduct a study on musculoskeletal disorders, in this, we' re trying to control the motion capture cameras with LabVIEW, I am trying to find the basic VI codes for this task, along with that, if anyone of you can give me some suggestion in this regard, I would really appreciate it.
Thanks in advance
Cheers
Deependra

We' re conducting a study on musculoskeletal disorders caused due to prolonged sitting, it's a project based on ergonomics, for that our quest to integrate all the components that we' re using, now these components inc a motion capture camera, the other hardware like force plate and emg, we have been able to calibrate them and integrate with LabVIEW, its' the motion capture camera, that we' re having issues with, so, I was hoping that if there's any VI code or any other source, citation from where I could get get some information on how to accomplish this.

MOVED: P45 Neo Problem

This topic has been moved to Overclockers & Modding Corner.
https://forum-en.msi.com/index.php?topic=124863.0

Quote from: Spax on 02-March-09, 02:19:07
But this is not overclocking it, the CPU's rated FSB is 1060MHz.
Runing at the jumper forced 266 means the CPU is running over 1GHz UNDER spec! (1.6GHz insted of 2.8GHz)
Without the 400mhz FSB the CPU is SLOWverclocked!!!
This jumper over clocking facility is pasted all over the Mobo box and literature and it seems to be somewhat fail
1) The default FSB-Frequency of your processor is 266 MHz (or 1066 MHz effectively). If you put the OC Jumpers into the 266 -> 333 MHz position, your processor will be hardware-overclocked to 333 MHz x 10.5 = 3496,5 MHz
2) If the power saving features of your processor are enabled (EIST and C1E Support (there is one option for each function in BIOS)) the multiplier will automatically reduced to x6 when the CPU is IDLE or has little workload. Giving the processor something to do, should cause the multiplier to rise back to x10.5. If the multiplier stays @x6 even though all power saving features are disabled in BIOS and/or the processor is under full load, you may have a serious temperature problem. The processor automatically clocks itself down, when it runs too hot.
3) Putting the jumpers into the 266 -> 333 MHz position does not mean that you cannot use the BIOS Settings to overclock further (400 MHz FSB-Clock Speed or more if you like.) Get ready to modify other settings as well (voltages and the FSB/DRAM Ratio) to get the system stable at higher speed.
4) Do not expect a system with an FSB-266-MHz-Processor to boot properly if your remove the OC Jumpers and force the FSB Clock Speed to 400 MHz. Most systems are not able to get through POST with that kind of frequency jump and without any further fine tuning of voltage settings.

Manually resetting the bios?

I cannot access bios visually, can I reset it by any other means?
Thanks in advance.

unplug it and use cmos jumper
if you oc the fsb use the jumper forces 100 fsb should sort you out

Send analog trigger every time data is acquired and saved

I am currently writing a program that acquires and calibrates data from 32 channels of force plates. Once the data is acquired and calibrated it is saved to a file. I need to send a pulse to another computer running labview once every time data is acquired and saved. I have written several versions of this code that send a continuous pulse train while data is being saved. I need to modify the code so that it does not send a continuous pulse, but an individual pulse that is a set frequency every time I acquire data. I believe that I need to use a software trigger to control the pulse, but I can't seem to find a way to have the hardware send a pulse only when I want it to.
The program uses a boolean as a start trigger for the acquisition process. In this manner when the data begins saving(i.e. the boolean is switched) it would send one analog pulse per iteration of the save loop. Unfortunantly I only seem to be able to either send a continuous pulse that I start before the acquisition begins or am not able send any pulse. During the time this pulse is being sent I am also constantly acquiring data from the card. I was wondering if there is any way that I can have the pulse start and initialize before the loop begins and then have it send one analog pulse of a set frequency every time the loop is iterated. I have tried both DAQmx and DAQ traditional solutions but have had no success.
Hardware: PCI-6071-E and BNC-2110 boxes, so I have a large selection of ports and my card seems to be compatible with all the latest software capabilities.
Thanks so much for any help!
~Matt

Actually after tinkering with it for several hours I managed to figure out a way to solve my problem. I'll explain it in case anyone else has a problem.
What the software does: The software is an acquisition loop that outputs a square wave pulse of finite frequency to another acquisition system at the beginning of each acquisition iteration while data is being saved. This is so that the data from the two systems can be synchronized later.
The program flow is this Send Single Synchronization Pulse-> Acquire Data->Calibrate Data->Save Data to file->Repeat
The pulse is triggered once data begins saving, but the device begins acquiring data on execution of the software.
To do this I set up the DAQmx Channl configuration to CO Pulse frequency. I then set the timing up to be finite iterations and the number of iterations to 1. Inside the acquisition loop I enclosed the whole acquisition process in a flat sequence. In the first sequence, if the program is saving data it turns the pulse on, if not saving the task passes through. The acquisition occurs in the middle sequence and in the final sequence if saving the task is turned off. If not saving the task passes through. This allowed me to send one pulse of a finite frequency every time the loop is run.
Thank you very much for your response though. If anyone else runs into a problem like this I can post a screenshot for future reference when I get a chance. Thanks again.

P45 Neo Problem

Hello folks, got a bit of a head scratcher here.
I built up my machine on Friday and had it running happily at 1.6 GHz with the mobo jumpers set in their default 266mhz positions. On Saturday I removed them to give me the 400mhz FSB, with this the machine was running happily @ 2.8GHz.
My next task was to flash the BIOS from 1.1 to 1.7 as I like to have everything up to date.
I carried out the bios flash and the computer restarted...
No POST...
After some head scratching I replaced the FSB jumpers back to their original 233mhx position, it then booted in to windows but I was back to 1.6GHz.
I tried flashing the BIOS back to 1.1 but still no POST with the OC jumpers removed.
Flashed back to 1.7, no POST with OC jumpers removed.
So after flashing the BIOS to 1.7 I have to keep the jumpers in the 233mhz position which limits the cpu to 1.6GHz. Using bios I manually configure the fsb to 400mhz with a multiplier of 7 to reach the chips specified 2.8GHz.
I boot in to windows and fire up CPUz which tells me the chip is running at 2.8GHz but the FSB is reporting a speed of 1600mhz, along with this windows has become unstable, my AV software (Kaspersky IS 2009) is unable to load, Opera web browser crashes while rendering pages and other programs also crash.
I bite the bullet and reformat but still find the same problems.
And reformat again, same results again.
I'm now on my 3rd format and posting here to see if anyone can shed any light on this.
This all occured after flashing the BIOS, which went as well as any other BIOS flash I've ever done.
I've got a tech question open with MSI (no reply yet ) if they can't help and I find no joy here then the board will be RMA'd ASAP
Cheers

Quote from: Spax on 02-March-09, 02:19:07
But this is not overclocking it, the CPU's rated FSB is 1060MHz.
Runing at the jumper forced 266 means the CPU is running over 1GHz UNDER spec! (1.6GHz insted of 2.8GHz)
Without the 400mhz FSB the CPU is SLOWverclocked!!!
This jumper over clocking facility is pasted all over the Mobo box and literature and it seems to be somewhat fail
1) The default FSB-Frequency of your processor is 266 MHz (or 1066 MHz effectively). If you put the OC Jumpers into the 266 -> 333 MHz position, your processor will be hardware-overclocked to 333 MHz x 10.5 = 3496,5 MHz
2) If the power saving features of your processor are enabled (EIST and C1E Support (there is one option for each function in BIOS)) the multiplier will automatically reduced to x6 when the CPU is IDLE or has little workload. Giving the processor something to do, should cause the multiplier to rise back to x10.5. If the multiplier stays @x6 even though all power saving features are disabled in BIOS and/or the processor is under full load, you may have a serious temperature problem. The processor automatically clocks itself down, when it runs too hot.
3) Putting the jumpers into the 266 -> 333 MHz position does not mean that you cannot use the BIOS Settings to overclock further (400 MHz FSB-Clock Speed or more if you like.) Get ready to modify other settings as well (voltages and the FSB/DRAM Ratio) to get the system stable at higher speed.
4) Do not expect a system with an FSB-266-MHz-Processor to boot properly if your remove the OC Jumpers and force the FSB Clock Speed to 400 MHz. Most systems are not able to get through POST with that kind of frequency jump and without any further fine tuning of voltage settings.

Controllin​g Kistler Quattro Jump Force Plate

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Controlling Kistler Quattro Jump Force Plate