Increase acquisition time in Cont Acq&Graph Voltage-Analog SW Trigger.vi

The NI example Cont Acq&Graph Voltage-Analog SW Trigger.vi takes one second of data. I need to take much more and can't figure out how to increase the acquisition time.
Is this something that has to be adjusted in one of the DAQmx task sub VIs?

Hello Richard,
Welcome to the forums. You post this question on the DAQ forums and that is the correct one to ask this so let keep it there and do not hesitate in posting back if you need more help.
Best,
Message Edited by Yardov on 07-09-2007 11:44 AM
Gerardo O.
RF Systems Engineering
National Instruments

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Cont Acq&Graph Voltage-Analog SW Trigger.vi

can thus example be modified so that its is sending out a wafeform, say a pulse for example; for analysis on an external scope?
i have been having problems generating a pulse output with my 6008, apparently it does not support hadware timin, so im wondering if
i can overcome this with the config, but in reverse? i.e using software timing

This example does not generate a signal on analog output channels
It acquires a signal on its analog input channels
Look at example vi's you will find in this folder
Find examples>>Hardware input/output>> DAQmx>> Analog generation and choose suitable analog generation vi from that folder

Error 89136 at DAQmx start task (Acq&Graph Voltage-Ext Clk-Analog Ref.vi)

HI,
I am trying to run example vi Acq&Graph Voltage-Ext Clk-Analog Ref.vi ( I have made some modifcations) in labview 8.2
I am trying to read pressure (from a compressor),
I have an encoder with 1024 pulses per revolution,
So I want to read 1024 samples for each of the 1024 pulses of the encoder and use the encoder as the trigger (with a channel that gives one pulse per revolution),
I get the error above and I have no idea why (I don't understand the settings at all).
Please help.
Attachments:
Acq&Graph Voltage-Ext Clk-Analog Ref.vi ‏43 KB

educob wrote:
Hi,
english is a foreigner language for me but i don't have significant problems understanding it.
My problem is lack of technical labview knowledge.
I want to read the pressure each time a encoder produces a pulse.
It should be as easy as setting the trigger (the encoder signal for each complete revolution) and the external clock (the enconder train of pulses).
But as easy as it sounds I can't do it.
Thanks.
Since that error message is telling that you are doing something that is wrong. I suggest you read the capabilities of the hardware. What you think the hardware should be able to do has no bearing on what it CAN do.

Why "Acq&Graph Voltage-Int Clk.vi" does not get constant voltage for constant voltage input?

Dear All
Labview 7.1/XP/NI6221
I try to use NI 6221 to read analog input by using "Acq&Graph Voltage-Int Clk.vi".
The reading voltage does not constant and not correct value, when I put constant voltage.
How should I solve this problem? Thank you.
When I use "DAQ Assistant" to read analog input it work well.
Thongchai

Thongchai,
As I recall from an earlier discussion exchange with you, you are performing Reference Single Ended (RSE) measurements on channels 0-3, is that correct? In the example, there is no selection for the input terminal configuration on the DAQmx Create Task -- for M-Series boards on channels 0-8 the default configuration is differential. If you right click on this input and select "Create Constant", you can choose RSE and it should measure the correct values. Let me know how that works for you.
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Applications Engineer
National Instruments

Acq&Graph Voltage-Int Clk.vi error-2147220712

Hi All,
I had this Acq&Graph Voltage-Int Clk.vi running excellently since 4yrs. Only yesterday I see this error poping when I run this program.
The pop up says : Error-2147220712 occured at DAQmx Create channel (AI-Voltage-Basic).vi
I tried to run the example Acq&Graph Voltage-Int Clk.vi and I get the same error.
could you help me to resolve this. Thanks a lot.
Regards
Nag

Hi Nag,
I have looked at your error and tried to find other people having had this problem. It seems that for some people it was fixed by reinstalling/repairing the DAQmx drivers.
This can be done by going to:
my computer >> add/remove programs >> national instruments
In the dialog box you should see the DAQmx drivers and be given an option to do a repair. Try this and let me know how it goes.
Kind Regards,
Laurence C.
Senior Test Development Engineer
Dyson Ltd

Cont Acq to File (scaled) results in unexpected behavior

I am writing an application based on the "Cont Acq to File(scaled).vi example". The DAQ card on my system is the PCI-MIO-16E-4. I am acquiring only 1-chanel with the following data acquisition parameters: Scan Rate = 30000, Buffer Size = 300000, Number of Scans to Read at a time = 1000. Since each scaled sample is 4 bytes and my scan rate is 30000 scan/sec, I would expect that with an hour of acquisition my file size would be approximately 432 MB (4*108000000 samples/hr). However my data file after an hour of recording only grows to about 1.2 MB. So i am assuming that i've lost lots of data. I am not getting a "buffer overflow" error and my "scan backlog indicator" averages about 2 during the entire hour...so i am
assuming that i am reading the data fast enough. Help

Thanks for your response. I found the problem on my program...but it now leads to more questions. The problem was that the output from the "AI Read" (a 2-D array) was wired into the input of "Indexed Array" but instead of indexing column 0 (i needed to extract chan 0) i instead was indexing row 0. The output from the "index array" is wired into my "File Write". After making the correction, my data file is growing at the right size. Now my question is what was written to file when the row 0 was indexed instead of column 0(the data seemed to be the correct value but lots of missing data)?

Add PXI 6508 to existing Cont Acq to file (binary)

I currently run LV Rt on a PXI chassis that has a PXI 6030E card installed. I have modified the example vi: "Cont acq to file (binary).vi" that NI provides as a DAQ example , to acquire 6 analog channels. I now want to append digital data to the binary stream and save to disk. I'll be reading in 50 digital lines using the PXI-6508 card.
I'd like to know how I might add the digital data acquisition inside my existing loop, make sure that the digital lines are appended to teh analog data, and if possible, I'd like to use a digital signal coming into te PXI 6508 to trigger data acquisition (rather than jhust running at the 240S/s that i currently run).
I have attached my existing code for the data acquisition.
Basically this code controls the release of a sled chair in which a human subject sits. the subject initiates release of the chair by a joystick, a laser fixation point is turned on and off at various times, and data from the joystick as well as various linear acclerometers is acquired. The data acquistion loop is in frame three of the main sequence. You'll notice that i am using some of the digital lines of the PXI-6030E but want to include many more digital lines by using the 6058
cheers
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Attachments:
PXI_collect.vi ‏308 KB

Hello,
You would just need additional port configs and some port reads for the ports on the 6508 you are using. Appending this data to the end of the analog data is fine. When writing binary data, the only thing that is important about the formatting is that you read it back in the same format you wrote it. You might look at some of the digital-only examples as well as some of the analog input with start trigger examples to combine some of these concepts.
Also, if you have more questions about this, you might try positing this question to the general data acquisition group. This sort of operation would behave the same way in Windows as it would in RT, and you would get a larger audience there for more possible responses.

Memory pool Code Cache increasing over time

Hi,
We are using JConsole to monitor some of our servers which are running JCAPS. We have a couple of JCAPS applications deployed on these servers. We are using JConsole to monitor this server and we can see that the Memory pool Code Cache seems to be increasing over time. It is around 21M at the moment and has gone up from 18M 3 days back. Is this accepted behavior? Should it not be a varying graph, going down coming back up again?
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This might be due to this bug raised for JDBC Client/Server connection
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Here are few conditions which are needed for this bug to occur:
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Acquisition time recording problem...

Hi buddies!
I have to do a program which permits me to get some datas from multimeter measurement. This program contains a delay time for the acquisition datas which are written both in a spreadsheet file and in a table.
My problem? In my table and in the created excel file, i don't get the data acquisition time but just the datas (that's not so bad). In the excel file i have the Universel time linked with my computer and in my table there is a date which is
"12/31/1903"
so : ??????
First, I'd like to change that and just have both a real date (not 31/12/1903 but for instance a date i can change to the current date) and the acquisition time of my program ie from the moment i decided to run it till end of acquisition i have decided either by stopping manually the programm or by the number of acquisitions. And if it were possible, having that both in my excel file and in my tablewould be perfect.
Thank you in advance, and i hope i have been well understood lol!
Daron
Attachments:
VOLTAGE MEASUREMENT & ACQUISITION RUNNING TIME.vi ‏192 KB

Hi Jarrod and Novatron!
First of all, thanks a lot guys for having answered me.
I have changed my program, it runs better. Concerning the excel file i succeeded in changing some things in my loop. Now i just want to had a fisrt line in my excel file, but as soon as the program running acquires the datas, the rpogram adds the first line i want him to written just one time.
I mean I just want in the first row, the topic of each column.
I just want this line to be written one time, and then every datas must be written in rows, each data for each column The example explains it very well.
Then i always get the same problem about the Universal time 12/31/1903 in my front panel and i don't know how to manage that.
I have tried to access to the write a table sub vi but no such a parameter can be changed...
Thanks for your help
I'm waiting for your suggestions...
Sincerely
Daron
PS : Jarrod enclosed the screenshot showing my problem concerning the time...
Attachments:
Wrong Date.jpg ‏131 KB
mesure example.xls ‏9 KB
VOLTAGE MEASUREMENTS last version.vi ‏163 KB

Data acquisition time of ocean optics spectrometer

Hi, LVers,
I has a S2000 multichannel fiber optic spectroscopy system. It includes two channels, master and slave. Additionally there is a channel labeled as 'LS-1'. I use labview and driver OOILVD32.dll to control this spectroscopy. In OOILVD32.dll, I use vi 'OOI SCAN' to acquire spectral data through master channel.
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Thanks in advance.

Hi Hello183,
Unfortunately, I do not know how your specific device works, however, I did find the product page for this device on the Ocean Optics web site, which points to the USB4000-series Plug-and-Play Spectrometer for more details. There seems to be a operations manual for this device. Perhaps this can shine some light on how the sampling works for your device as well.
Aaron P
National Instruments
Applications Engineer
http://www.ni.com/support

Data acquisition time not continuous, but starting over and over again

Hi,
My data acquisition time is not continuous but loops over and over
again. Could someone please take a look at my vi to see if you
have any thoughts on how to fix this. Also, I tried to set up my
vi so that I could take the mean of the signal at any time I
choose. However, at the same instance that the data acquistion
time "starts over" again, the mean is calculated (before I trigger it to take the mean)
I have attached my vi and my output file as a text file so that what
I'm trying to say will (hopefully) make a bit more sense.
Thanks for your help in advance!
Sherri
Attachments:
Datalog1 71805.vi ‏1252 KB

Hi,
Thanks for responding to my question. Attached is the vi with added
comments as to what I think I am doing. By DAQ time, I mean the
first column of data that is in the data file that I attached
previously. I am only simulating a signal (at the beginning) so
that I can program in my office. I do, however, have the same
problem as stated above when I change the simulate signal to DAQmx
using my instrument.
I hope this clearer. If not, I'll try again.
Thanks so much!
Sherri
Attachments:
Datalog1 71805 83.vi ‏1228 KB

How to increase the time at the end of what aaa requeries the authentication of a client web

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Increase acquisition time in Cont Acq&Graph Voltage-Analog SW Trigger.vi

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