Multiple channels displayed in curves

Is it possible to simultaneously diplay multiple channels side-by-side with their respective curves and histograms when making curves adjustments? --Not just simply overlaid upon each other in a single grid.

No. I'm not even sure what that would be good for other than gobbling up tons of screen space, since it really doesn't tell you anything. It's one of the less endearing features in som color correction tools. Anyway, you have two redundant sets of keyboard shortcurts for switching channels inside such panels, and I'm sure that this allows switching fast enough to get whatever adjustments you need done just as quickly.
Mylenium

Similar Messages

Display multiple channels on waveform graph

Hello,
I would like to display multiple channels of acoustic data on one waveform graph. I currently have them separated and controlled by tabs inside a case Structure. I sometimes have run into DAQ error because I'm looking at 10 channels of 1/3 Octave data real-time. I woundering if I display all the channels on one waveform graph would I elimnate this error.
can anyone help?

Philip,
I'm acquiring data at 44KHz sample rate and my frequency range is 0-20kHz (2 ni-4472 DAQ cards). Since I been using LV (off and on now for about a year) my application is still in the development stage. I tried including pics but could only include 1 at a time, so heres a copy of my vi for you. There is several things I'd like to figure out, I'm viewing data real-time and writing data to file. However, as I'm writing data to file I don't want the data to display in real-time (I think this is where my problem is). The other issued is when I've stopped writing data to file, the case structure outside the while loop opens the file and processed the data, however I'd like to see the data in the same display (waveform graph in while loop). Take look and give me thoughts.
R/Scott
Attachments:
Submarine DAQ_writing reading OFFLINE_Rev2.vi ‏829 KB

Displaying real-time data using gui meter from multiple channels.

I am using DAQ USB-6009 for my assignment. Part of my task is to display real-data from multiple channels in the form of gui meters. eg. irradiance and voltage...
I used a split signal to separate the signals from different channels coming out of the data output terminal of the DAQ assistant. The problem is that I do not know which vi to connect in between the split signal and the gui meter. I am looking for one vi that is capable of handling signals (measurement) and outputting the data to the gui meters simultaneously and individually based on the channel they are coming from.

Thnx for your tip, Dennis.
However, I have another problem that just occurred to me when my VI manages to execute as I wanted.
I noticed that the needle on my gui meter will only "appears" to be responding to every changes to its input when I have set it to run continuously and the only way to stop it is via abortion which might leave the resources (eg. external hardware) in unknown state. Is there any safer and workable ways to organise the VIs using while loop?
I have placed my DAQ assistant, write to measurement file (vi), add function, split signal and gui meters all in 1 single while loop.
    DAQ-------> write to measurement file
             |
             |                                                                    |--------------------------------> add function----> gui meters
             ---------------------------------------------> split signals ---|--------------------------------> add function----> gui meters
                                                                                  |--------------------------------> add function----> gui meters
If I do the following steps,
1. press run continuously to start the VI
2. click the same button to disable continuous run when the VI has completed its task.
3. click the stop button in the front panel to stop the while loop
Does doing these steps ensure that I will not leave resources in unknown state? Is it a safer way to stop a VI which is running continuously?
Pardon me for I am new to LabView. Even though, I have read the user's
manual and tried out all the execises, there are some concepts that I
need clarification on and mistakes that I need to discover through more hands-on.

ERROR MESSAGE: Automation, Multiple Channels?

7.1.1
Sometimes when I'm refining already existing volume automation with the mouse+on screen fader, the fader gets b!tchy about being moved and all kinds of jagged automation curves results from otherwise smooth movements of the mouse. If I click on some of the nodes to straighten them out, a dialog box appears saying something about "multiple channels found, do you want to convert them".
Anyone else run across this message? Wondering why it's happening too...
-=iS=-

"Events of the same type with multiple MIDI channels found!"
Anybody know how to disable this message or overide it?
This most usually happens when I copy a MIDI region (including automation) to another MIDI track and then adjust the automation in the new track.
I assume this is not an error message because it's not indicating a mistake. Logic is just asking how to proceed (and there's no 'Cancel'option). Logic probably recognizes the identical nature of the two regions and asks if I want the same changes to be mirrored in both regions (which is handy), but more often than not I don't. Clicking 'Keep the Same'
How do I get Logic to not display this message? Is there any Global MIDI editing preferences?

Data acquisition from multiple channels.

Hello
Right now, I am able to acquire the signal from a single load cell and display it.But I would like to know of how to acquire acquire signals from two load cells simultaneously.I am using Labview 6i and I am using AI S-Scan with AI config to acquire the waveform.It would be of great help if you could suggest a simple method to acquire the signals.
PS: Please find the attached file used for acquisition from a single load cell.
Looking forward for your reply.
Manasa
Attachments:
test 4.vi ‏102 KB

Hi Manasa,
If I understand what you are trying to do, it is relatively
straightforward to configure your application to acquire data on two channels.
I was unable to run your vi as it was missing some of the subVI’s
from your application. However, your
attachment was sufficient to see what you are trying to do.
Here is how to add channels:
1.
In the I/O Channel Constant, you can add
additional channels by using a comma or a semi-colon. For example, to scan the first four channels
you would put 0:3 in the constant (see attached screenshot ChannelConfig.jpg). To scan the first and third channel you would
put 0,2.
2.
The AI Single Scan VI will now read from
multiple channels. Often it easiest to
configure the output of this VI for viewing by first putting the data into an
array using the Build Array VI. It can
then be plotted in a waveform graph. (see attached screenshot ReadtoGraph.jpg
and WaveFormGraph.jpg)
Just a few notes about “simultaneous” sampling:
Most of the NI data acquisition cards have a multiplexer
between the various input channels and the Analog to Digital (A/D) converter
creating a very small delay between each channel (usually ms range or
smaller). NI does make several data acquisition
cards that can perform true simultaneous sampling, meaning that there is an A/D
converter for each channel.
For the large majority of applications, the small delay
between channels is negligible.
Jared T.
Attachments:
ReadtoGraph.JPG ‏21 KB
ChannelConfig.JPG ‏288 KB
WaveFromChart.JPG ‏61 KB

How would you apply different calibrations to multiple channels

I'm attempting to apply calibration data to multiple channels. The calibrations could have been done at different times for different channels and could be using different fits. I think I have a solution for just applying the calibration information to one channel. I'm posting the solution for one channel in this post. In the next post I will include the multi-channel problem I'm working on. I had to add txt onto the initial file in order to post this.
Thanks in advance.
Solved!
Go to Solution.
Attachments:
Apply Calibration One Channel.vi ‏138 KB
Initial.txt ‏1 KB

Thanks for the links John. I just logged on to post my working solution so I haven’t had a chance to look at them yet.
I’ve been working on this problem and have come up with the below attachment. I believe the logic is correct, but do not know if this is the most efficient way of doing this. I start by reading the calibration information in my ini file for only the channels that I am collecting data for. This is accomplished by the case structure enclosed in the for loop. The calibration values are stored as variables so I don’t have to read them with each data point I collect. I then start the data collection within my while loop. As I collect the data I pass it through a for loop where I apply the calibration curve to it and pull the calibration variables from the 2nd case structure. I’m using a for loop for this so I can index the wave files and apply the correct calibration information to each one. The channels and sections will be inputs to this vi from the choose channel vi.
John I don’t know if this is better or worse than what you are suggesting. I will read the links you sent me.
Does anybody have any comments on what I’ve put together?
Thanks, Eric
Attachments:
Acquire and Transform Data.vi ‏209 KB

Multiple channel sampling and write file

Hei,
I wrote a interface which is supposed to allow me to plot multiple channel and write all those datas in a file ; The problem is that :
1- not all the curves are plot in my graph (in fact just one is ploted).
2- At the same time it write in a file but after some times it stoped due to an error : buffer size...related to the offset.
I have attached the vi, I don't understand exactly where those problems are comming from and how to solve them easily.
Thanks for the help
P.
Attachments:
project.vi ‏207 KB

Hi thanks those tips. In fact I had solved those problems mentionned above ; I have alomst finish my interface except that I am trying to write all my datas in a file , in column (all channels) and create a first column at the time (maybe from the sampling time). The problem is that I don't know the output fomat of the "analog 2D DBL" vi and it seems that my way of writing datas time step per time are not right. have you already see this kind of used (analog 2D DBL)? I am using a PCI-6229, and DAQmx 7.3 Drivers
Thanks for your help
P.
Attachments:
project_acquisition.vi ‏338 KB

Acquiring Analog Input from Multiple Channels in Labview

Hello,
i am working on a VI where i need to acquire signals from multiple channels in Labview using NI-9129.Initially i want to acquire contineous input signals (voltage and current) and display it on the graph.
Having looked at forum and Labview examples i tried to make an initail VI but i am not sure if the setup i made needs any modification to serve my purpose.I am fairly new to Labview software.
All i want is
1.To acquire conteneously current and voltage
2.Display current and voltage individually on the graph.
3.Perform some basic calculations like MAXIMUM,MINIMUM and AVERAGE values of voltage and current.
4.Log the data into excel file
I have attached the VI i made so far.i need abit of advice if i am moving in the right direction or not.
Thank You for having a look at my question.
Attachments:
Voltage-Current VI.vi ‏81 KB

Engr_tech wrote:
i think i already have the tdms for data logging.as far as the tdms data logging is concerned,when i enable the logging mode to "read and log" the data logged inside the excel sheet would be seperate for current and voltage.?
Is it practically possible to acquire data from 4 different channels and plot them.if yes,then am i right to assume that all i need is to modify the current VI for four channels having all of them in parallel.
Yes, you are logging directly to a TDMS file. This is definately the best route for data logging from a DAQ. The currents and voltages will show up as different channels in the same group.
To add more channels, just add them to your DAQmx task. The logging will handle it with no issue. Your calculations will also a little work to add the extra channels. Same for the graphs, since you are using seperate charts.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Sme device multiple channel different bridge

Hi
I am using NI 9219
I have input from three different channel configured in different bridge mode with internal excitation.
I am able to acquire signal from each channel individually,
But I am not able to acquire data from all channel from a single vi an display them in a single graph.
Please help ASAP
Thnx
Ravinedr

Hi Revinedr,
It sounds like you are probably trying to run multiple analog input tasks at the same time. You can only run one of these tasks at a time. You can set up your task to include multiple channels with different bridge configurations, just set them up sequentially with the Create Virtual Channel VI.
Message Edited by PBear on 06-20-2008 12:53 PM
PBear
NI RF
Attachments:
multiplechannelbridges.gif ‏5 KB

How to create multiple channels in DAQmx

Hello ,
I created an application based from this example program, MultiFunctionSyncAIAO_DigStart (from VCNet).
I added another input and output channels, which later on I plan to add trigger features between
the two signals ( could be both inputs, both outputs or a combination of I/O). For now,
I am concentrating in the creation/ setup of multiple signals.
I desperately created multiple channels by converting the variables to array. Obviously, this
is not a smart move. Then, I saw this function DAQmxAddGlobalChansToTask which creates multiple channels.
Unfortunately, I do not know how to use it. ( clueless )
Please send me a snippet of the function usage for further understanding.
Are there any other methods to create multiple channels based from the function/s used in the attachment?
Thank you.
A
DAQTestingDlg.cpp (14 kb)

Hi Patrick
To convert the code using multi I/Os, I included the multi reader/ writer header files.
Plus, those variables that require updating of data type are now in CNiReal64Matrix.
I also omitted the SineWave(), which i think I cannot use it with the CNiReal64Matrix data type.
But, I wonder why is that I have no significant output based from the amplitude. I hooked it up
with the scope but saw nothing. Aside from the changes that I mentioned, I didnt do anything
drastic. To make the conversion fuss-free using the same example, i retained the UI and converted
the single functions to the multi functions. I will add the control for additional I/Os later on.
Please point it to me why the code has no output after the m_outputTask->Start(). I really can't get the output
portion working it. I browsed through the different voltage analog output for VC++ but all examples
use the single function.
Btw, is there a way that i can use a sine wave or similar function to display a nicer waveform?
Thanks a bunch for all the help,
A
Attachments:
MultiFunctionSyncAIAO_DigStartDlg1.cpp ‏15 KB

Audio Volume Sliders for multiple channels of audio

I don't even know if this is possible, but I was wondering if
there was any way you can set up volume sliders to control multiple
channels of audio. For a project I'm working on I am going to have
background audio and comentary. I want the user to be able to
adjust the volume of both the background audio and the comentary.
Is there any was I can make seperate sliders for each of those
tracks of audio?
Thanks!

you can not.
the only workaround i can think of would be to create a volume curve on one track, and then duplicate that track as many times as needed, and drag the regions of your other tracks into these duplicated tracks.

Reading multiple channels for multiple graphs

Hey I am fairly new to Labview and am using it just temorarily. My project is to take in readings from a Gaussometer (X,Y, and Z axis) and graph them in read time. The Gaussometer outputs a DC Voltage equal to the gauss of the magnetic field. The X,Y,Z all come in on three differnet channels. Connected to a NI USB-6009
I know I can use the Express> DAQ Assistant, however that outputs "Data" and I was hoping to use this in an Array. So I used the DDT to Array to convert it to the Array format that I needed (thanks to the forums for the help there). My only problem is that I don't know how to do this with multiple channels at the same time. But I have possibly been going about this all wrong.
So I just wanted to know if I could get some help on how to read multiple channels and write to them to three different graphs in real time that would be of great help.

Whether or not you use the Convert From Dynamic Data or the Split Signal, your data should be shown as soon as the DAQ Assistant returns. How you format the data is irrelevant. If the number of samples you request is greater than the sample rate, then it will take longer to acquire the data and there is nothing you can do about that except reduce the number of samples and acquire in a loop. You can append new data to old and display everything in a graph if you want.

How do I read multiple channels at one time using labview with the Fluke Hydra Data Bucket 2620a using serial port?

I need to take a reading of 15 channels about once a second. I can read one value at a time using the monitor function on the read values.vi driver, but this takes forever to read all the channels.

I don't have this instrument but I took a look at the instrument driver and it appears that you can only configure one channel at a time to read from. You might want to take a look at the command set for this instrument and see if it allows for configuration of multiple channels. It could be that the instrument driver just doesn't have that built in.
J.R. Allen

How to Read from multiple channels

Dear Sir
I am acquiring data using FP-RTD-122 using OPC Client software. I ahve made one socket for that and i am using command
CWDataSocket1.AccessMode = cwdsReadAutoUpdate
CWDataSocket1.URL = "opc://localhost/National Instruments.OPCFieldPoint/FP Res\FP-RTD-122 @1\Channel 0"
CWDataSocket1.Connect
v = CWDataSocket1.Data.Value
where v is a variant type.But this is 8-channel RTD so how can i read values from all channels using single socket connection Because at presnt i have to use 8 sockets for all eight channels.

At least as of FieldPoint 4.0 and earlier (I do not know about 4.0.1 or later), the OPC Server did not support multiple channel analog items. Thus to read all eight channels of a FP-RTD-122 module, you would need 8 separate socket connections. For discrete modules (boolean), the "All" tag, is treated as a single 8 or 16 bit number.
Regards,
Aaron

How to use multiple channels with one remoteObject .

hi,
I have an application which is accessed through HPPS some
times , also it can be access on server with http service.
so I want to know how to configure config files or add
runtime channels which will support either channel depending on
the server it is accessed over.
Is there any one who can help me to solve this...i need it
soon.
thank you...

Hi,
Please visit the URL below for details on adding channel sets
at runtime. Add multiple channels to the channel set so that the
fall back mechanism works.
http://livedocs.adobe.com/blazeds/1/blazeds_devguide/runtimeconfig_5.html#194376
Hope this helps.

Multiple channels displayed in curves

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