Bad data from daq

I am taking data off of a radar gun. The gun is connected to one channel of a 16 channel circuit board which sends the data through an ide cable to a DAQ notebook card. This exact setup worked at one time on an older computer. Now the signal from the gun is too weak to read. I have watched the data real-time using the test panel in the Measurement & Automation Explorer. In doing so, I noticed one aditional concern. The data peaked whenever I lifted my feet off the ground. This peak was even more dramatic if I had one hand touching the radar gun.
Thanks for the help.
Albert

Albert,
It sounds like you may have a grounding issue. Is your board configured for reference single-ended (RSE) or non-reference single-ended (NRSE)? When you say "too weak", does this mean you aren't reading anything? What voltage are you expecting to read. Is the laptop plugged in when you are acquiring data? That is, does it have its own ground reference? You may want to analyze your setup as far as determining your various ground references. I would also suggest reading the following tutorial that discusses many factors that need to be taken into account when wiring signals in the field.
Tutorial

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Acquiring data from DAQ

Please, I am writing a VI to acquire data from one micrometer (like a quad encoder) and a quad encoder for the position. How can I store data coming from the micrometer ( read by a channel of a multifunction DAQ ) in an array of 5000 positions ( one for each millimeter of movement ) ? Thanks

First initialize a 5000 element array (Not a Number (NaN) data suggested), then run your acquisition loop and replace the array with the acquired data at index position. This is much more efficient than building the array progressively. Use a feedback node to store the array during execution. Look at the attached vi.
Note that this works with single data points. If you were recording multiple data at each loop iteration, then you would have to calculate the replace position by multiplying the loop iondex with the data length.
Hope this helps !
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
Fill_array.vi.zip ‏12 KB

Acquiring data from daq-pad and saving video at the same time

I am trying to record data from my daq-pad at 100 samples per second. At the same time I am using a usb interfaced camera to record a video feed. The idea is that when i begin recording data i also begin recording the video feed.
The way I record the video feed works fine in its own VI (I need it to record at 30fps and it does this just fine). But when I integrate it with the data record/capture VI the framing rate slows down to only 10 fps. I suspect this is because the VI gets caught capturing the data from the daq-pad thus slowing down its ability to record the video feed. I was hoping you could give me some help with how to record the data at 100 samples per second and get the VI to capture 30 frames per second. Thanks in advance for anyone who helps out.
I've attached the VI that has both the data capture and the video capture already integrated.
Attachments:
usa_swimming with video21.vi ‏892 KB

Hi,
I took a look at your code and the problem is that you have both the data acquistion and the image acquistion in the same loop. Have you tried using parellel loops? There is more information about this in the labview tutorials that are available online if you are unsure how to do that. The problem is that you are doing a lot of things in that loop (acquiring data, doing some analysis, and writing to file), so you can't acquire images very fast because it depends on the speed of the loop iteration. I hope this helps.
Have a great day,
GG

Bad Data from Cache after infoprovider update

Hello,
We have queries running off of a multi-provider consisting of 4 cubes. Occasionally when we generate quires after deltas have been loaded into the cubes we get incomplete or bad data. Deactivating the cache or deleting the cache and runing the query again always seems to resolve the problem.
Any thoughts on what the issue might be and how to resolve?
Thanks
Stan Pickford

Stanley,
after any data change in an InfoCube, table RSDINFOPROVDATA should contain the timestamp. This timestamp is used by the OLAP cache to determine if new data has been loaded or if the cache is still valid.
I'm not aware of any problems. If it is reproducible and you can't fix it, open a message to SAP Support.
Regards,
Marc
SAP NetWeaver RIG

Bad data from LinOPC server

I am working on a LabVIEW SCADA system which connects to a Eurotherm DCS using the LinOPC server. After startup, all tags with unchanging values (eg setpoints, booleans) return a default value and bad status in the (LabVIEW 7.1) tagengine. Once the value of the tag has changed (either from the DCS or by writting a value [if writeable] the status becomes good and the correct value is returned. I have tried changing the engine update parameters without success. Connecting to the tags in the LinOPC server using NIs Server Explorer produces similar results, but connecting using Eurotherm's iTools OPC Scope returns all values. Has anyone experienced this problem or know of a solution/work around?

Duplicate Post

I'm a newer in using Datasocket,now I want to send data from DAQ(6052E) to another computer B,

I have two types data,so Datasocket write string
vector.vi and Datasocket write double vector.vi are used in my application,but in computer B my programm always reports "Not permitted to creat new item (0*80004005) ",Datasocket read double
vector can recieve data properly. What should I
do?

Most probably the permission settings are not correct. Launch "DataSocket Server Manager" on the server side and add computer B IP address under "DefaultReaders" and under "DefaultWriter".
I usually like to have "everyone" as reader and write to solve such problems if security is not a big concern. That way i don't have to change the setting everytime new machine wants to read/write.
hope this helps
A Rafiq
National Instruments
http://www.ni.com/ask

Problem with recovering data from Bit Locker enabled hard disk with bad sectors

Hi,
I have Lenovo T430 laptop with Windows 7 and Bit Locker enabled hard disk. While working I encountered blue screen error multiple times. After some time, the laptop stopped to boot by itself and started showing error 'A disk read write error has occurred.
Press Ctrl+Alt+Del to restart' message. I tried to connect the hard disk to a different PC as a secondary drive and tried to check the disk to recover the data. The 500 GB disk is showing as unallocated space and I am not sure how to recover the
data from the hard disk. Appreciate your help to recover the data from corrupted hard disk.
I used the Lenovo Diagnostics tools available in BIOS and it showed 48 bad sector errors on the hard disk. I also used Windows 7 CD and tried auto repair but it looks like it didn't do anything.
Thanks in advance!

Hi SenneVL,
Since there are 48 bad sectors on your hard disk, this means the system can not boot any more, the data might not be restored in a normal way, you'd better turn to data restore company for help.
Regards
Wade Liu
TechNet Community Support

How do I move data from a DAQ into and out of loops and structures?

I have a set of RTD probes set up to read data into LabView through a DAQ. This block of code is in a while loop
that executes alongside of several other loops simultaneously. I need to use the data from the RTD probes in other
loops and case structures specifically for logic tests.
The problem is that I can't seem to bring the dynamic data out of the DAQ containing while loop or into the other structures.
Any ideas?
I have had some success with using multiple DAQs and stopping all others while I need the data inside of a case structure.
Is there a way to reference data from a DAQ or to run multiple DAQs that read the same data from the same channels without getting a "Task in use error"?
Thanks,
-David

Search the forums for Prodcuer/consumer architecture.
This uses queues to pass data from the producer loop (such as your data acquisition loop) to other "consumer" loops. These are the other loops where you want to use the data.
You won't be able to use multiple DAQ Read functions at the same time. As you've seen you get error -50103 about the resources already being in use.

How to acquire data from 2 chs of the same DAQ card at different sampling rate

I am using single DAQ card (either 6013 or 6014) in my system i want to acquire data from 2 (or more) channels with following requirements
1. sampling rate of each channel should be independant of each other (say one is 20 Hz and other is 15 kHz)
2. data from all the channels should be acquired simultaneously.
3. coding must be done using DAQmx VIs
I have tried out following things
1. I created separate task for each channel: i found out that two tasks can not run simultaneously even though the channels are different
2. I tried out single task with two channels included in it. and i used 'channels to Read' property to determine from which ch. i want to acquire data: this method works fine if the sampling rates are same. but if i change the sampling rate of one channel it gets reflected in other channels as well.
can somebody help me out to solve this problem.
i will appreciate if somebody can post the sample code as my deadline is approaching
Tushar Jambhekar
[email protected]
Jambhekar Automation Solutions
LabVIEW Consultancy, LabVIEW Training
Rent a LabVIEW Developer, My Blog

Hi Dennis Knutson
Thanks for your suggestion.
Tushar Jambhekar
[email protected]
Jambhekar Automation Solutions
LabVIEW Consultancy, LabVIEW Training
Rent a LabVIEW Developer, My Blog

I am trying to log data from 4 voltage input signal using labview, but when i use DAQ assistant i am able to log data from one signal at a time only.

I am trying to log data from 4 voltage input signal using labview, but when i use DAQ assiatant i am able to log data from one signal at a time only.I am trying to get all 4 input data to logged in a single file againt time. I am new to Labview, I need to sample this data within a couple of days can someone help please.

Naveen
Check out the info in the Analog Input section of the document linked below. (Ignore the part about Global Channels.) In Figure 5, notice that you can select multiple channels while holding <Ctrl> or <Shift>.
Developer Zone Tutorial: NI-DAQmx Express VI Tutorial
Kyle B | Product Support Engineer | ni.com/support

BADI for transfering data from one modal to another modal within single appset

Hallo Experts,
My Business Requirement is Transfer of data from one modal to another in same environment and did this taking reference from below document.(How to custom badi for replicating destination app)
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/e04b5d24-085f-2c10-d5a2-c1153a9f9346?QuickLink=index&…
Document contains TR for implementing BADI, but this document supports bpc version 7.0 and we are using is bpc 10.0.
So i make all compatible changes in BADI implementation and activate it. Now i am testing using transaction UJKT using following script.
and the result is records successfully written back to application MIS, but when i check data is not moved to target application MIS.
I am facing stuck situation in my project work. Please Suggest. Hope for positive reply.
Script:
*XDIM_MEMBERSET WM_ACCOUNT = WM_041,
*XDIM_MEMBERSET WM_UOM_02 = UOM_004
*XDIM_MEMBERSET WM_UD_2 = WM_07
*XDIM_MEMBERSET WD_EXT_MAT_GRP =CHALK-PH-I,CHALK-PH-II,CHAVN-PH-I,CHAVN-PH-II,NASHIK-WM,RAJASTHAN-WM,TAMILNADU-WM
*XDIM_MEMBERSET CATEGORY= Plan
*XDIM_MEMBERSET AUDITTRAIL=Input
*XDIM_MEMBERSET P_ENTITY = SIL
*XDIM_MEMBERSET RPTCURRENCY = LC
*START_BADI DAPP
   DESTINATION_APP ="MIS"
   RENAME_DIM ="WD_EXT_MAT_GRP= PRODUCT"
   ADD_DIM ="PLANT=NO_PLANT","MIS_ACCOUNTS=CAIN0058040008","COST_CENTER=NO_COST_CENTER","FLOW=Opening","UOM=AMT","CUSTOMER_SALES_2=NO_CUSTOMER","CATEGORY=Plan","AUDITTRAIL=Input"
   DEBUG = ON
   WRITE = OFF
   QUERY = ON
*END_BADI
Please find attached result.
Regards,
Dipesh Mudras.

Hello,
Here is the manual to copy data between apps (it works with BPC NW75):
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b0480970-894f-2d10-f9a5-d4b1160be203?quicklink=index&overridelayout=true
It works me, but now I need to modify the Script Logic to make that a "property" from the origin dimension has to be copied to the destination dimension as "id", like follow:
//*XDIM_MEMBERSET CATEGORY = %CATEGORY_SET%
//*XDIM_MEMBERSET TIME = %TIME_SET%
//*XDIM_MEMBERSET ENTITY = %ENTITY_SET%
//*XDIM_MEMBERSET RPTCURRENCY = %RPTCURRENCY_SET%
*START_BADI FiltroPD
     WRITE = OFF
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     ADD_DIM = "ORIGEN = APPVENTAS"
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*END_BADI

Can I recover data from a reformatted hard drive? I did not do a back up prior to talking to Apple Support and the guy having me delete the hard drive and start anew. My bad but is all lost??

Can I recover data from a reformatted hard drive? I did not complete a back up prior to talking to Apple Support and the guy having me delete the hard drive (10.5.8) and start anew (10.6.3). My bad but is all lost?? Years of very important information....

You will need to purchase reovery sofware such as such as FileSalvage
http://subrosasoft.com/software/filesalvage
You can download a demo copy that will tell you what it can recover
If you want to recover that you must pay for the software then
When you do the recovery, you will need another disk drive to receive the recovered files
Having install a new operating system on the disk after the retformat is going to gradually reduce the amount of data that this software will be able to recover for you
Allan

How to properly read data from one DAQ-assistant and write simultaneously with another DAQ-assistant (which is inside a loop)

Hello.
I'm a newbie working on my Master's thesis conserning a project that is based on old G-code made by another newbie so bear with me.
I need to create a sequance of output controls. For this I'm using a for loop that eventually creates two triangular ramps during a period of 90 seconds. I've confirmed that this function works properly by measuring the actual output of the DAQ-decice (NI USB 6353).
The problem is the following: During this controll-cycle I need to simultanously collect data from the same DAQ-device. At this point there is only one DAQ-assistant output-block in the main loop of the program and all the signals are derived from it to where they are needed.There is a case-structure (the bottom case structure in the picture) that contains the functions needed to collect the data during the test cycle. However these two actions, outputting data and inputting data, are not synchronized in any way which may be the reason why I get the 200279 error or alternatively the 200284 error during the test cycle. I've tried changing the sample rate, buffer size and the timeout time as adviced but nothing seems to help.
What would be the simplest way to solve this problem?
Help is greatly appreciated!
Attachments:
problem.jpg ‏206 KB

Thanks for quick reply.
However, I did try it (see the picture) but I still have a problem: I only get 100 samples / channel during the test sequence (all from the first seconds of the sequence) in total even though I've set the data aqcuiring DAQ-assistant as "continous" and "samples to read = 95k" and rate is 1000Hz.
Edit.
And lastly, I have trouble adding this "extra" DAQ-assistant to the vi. because I get an error about a resource (The 6353) being reserved, even though I connected a false constant to the "STOP" -input of the main DAQ-assistant.
Attachments:
is_this_what_you_meant.jpg ‏212 KB

How to recover data from bad hard drive

Once a hard drive goes bad (cannot get into the computer), is there any hope of recovering any data from it? If so, how?

Do you mean the hard drive is mechanically broken for sure? It's not a data corruption issue that is causing a problem with starting up the Mac, but maybe not be a bad mechanism?
If the drive is definitely broken, there are businesses that specialize in recovering data from bad hard drives. For example
http://www.drivesaversdatarecovery.com/ (I always saw their booth at MacWorld Expos...)
The cost of such services is usually high.
cannot get into the computer
So that probably means the hard drive in question is the internal drive? If you don't know for sure that the hard drive is physically broken, you can try starting up using your Mac OS X installation disc. Insert disc in optical drive and start up with the C key held down. When you get to Installer's screen, go up to the menu bar and run Disk Utility from the Utilities menu. Does the internal drive appear in the Disk Utility sidebar?
Alternately, if you have another Mac (that has FireWire), you can try starting the Mac with the problem in FireWire Target Disk Mode,
http://support.apple.com/kb/HT1661
Connect the "target" Mac to the other Mac (running normally) using a FireWire cable. Run Disk Utility on that Mac. Does the hard drive of the Mac in FireWire Target Disk Mode appear in the sidebar?
If you can get the internal drive to appear in Disk Utility, you may be able to run Repair Disk on the First Aid tab. There are also third-party utilities, such as TechTool Pro (Micromat), Drive Genius (Prosoft), and Disk Warrior (Alsoft), that may be able to fix (or at least recover data from) the hard drive.

How to recover data from a hard drive with bad blocks?

An external hard drive, 4TB Iomega...connected via eSATA cable...had a power outage and the drive won't be read by OSX now. (Yes, it was on a surge protector and no I did not have a backup. I was actually preparing for the process of creating a backup when the power went out!) Anyway, I have tried using Data Rescue 3 and DiskDrill to try and recover data from the drive. I can recover the first 1/3 of the drive, but it ejects when either app tries to access the bad block. Can anyone tell me how/what software to use to recover the data? I know there are programs that will avoid the bad block but I've only found them for Windows. Are there any that will do such a thing in Lion? Any help will be appreciated...and no, I can not afford a data recovery service. Trying to do this on my own.

Basics of File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive. Two free alternatives are Disk Drill and TestDisk. Look for them and demos at MacUpdate or CNET Downloads.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.

Bad data from daq

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