Sample mode: sample on request

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• DAQ 1 sample (on request) vs samples keep

  Hello

  I have an NI USB-6501 data acquisition.  The device does not support the acquisition of continuous samples.  I need to constantly question the DAQ for signal change.  I was thinking about putting the DAQ inside a loop and just re-acquring 1 sample assist time and again.  Would be the cause of performance problems?  I would like to run the loop about 1000 times per second.

  See this reference. Your results may vary considerably and there might be large amounts of jitter.

  PS You have posted to the wrong Board. You should have posted in the digital I/o card.

• I've never set up a master password for firefox. Somehow the browser locked mode, now and request a master password. How can I get it to unlock?

  There is no URL line, that anything can be taken.

  Also, I have reinstalled the program as well. No change. Always default to a request for a password THAT I HAVE EVER CREATED.

  Full disclosure: I reached to reconnect cable and pressed my chest against my keyboard while the computer was in mode 'sleep', with Firefox running in background. When I was in, the browser has been locked. I tried all the passwords I know and use. No luck. Following addy won't charge, even if the entry on the home page.

  chrome://pippki/content/ResetPassword.XUL

  Yet once, no url line does open, I run the browser, more. I just get the following message:

  Please enter the master password for the software security device.

  Help! Thank you!

  Create a new profile as a test to see if your profile is the source of the problems.

  See "basic troubleshooting: a new profile:

  • https://support.Mozilla.com/kb/basic+troubleshooting#w_8-make-a-new-profile

  There may be extensions and plugins installed by default in a new profile, so check that in "tools > Modules > Extensions & Plugins" in case there are still problems.

  If this new profile works then you can transfer files from the old profile to the new profile, but make sure not to copy corrupted files.

  See:

  • http://KB.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

• Windows asks me a password and I never put a. I also try to boot into safe MODE and administrator request a password as well. How can I work around this connect? __

  can not connect to windows

  If you have forgotten your password, if you have another user who has administrative privileges account you can log in to that account and change the password of your account of origin of the user accounts applet in Control Panel. If you do not have another account like this set upwards or that you do not have the password which you will need to log on to the built-in Administrator account. In XP Home, start the computer in Mode safe. This, by repeatedly pressing the F8 key as the computer starts. This will put you in the right menu. Navigate using your arrow up; the mouse does not work here. Once in safe mode, you will see the normally hidden administrator account. The default password is white.

  In XP Pro, you don't need to go to Safe Mode. In the home screen, do Ctrl-Alt-Del twice to get the classic Windows logon box. Type in "Administrator" and the password that you assigned when you set up Windows.

  If you reset the password of the account administrator integrated into house or have Pro and don't remember the password, use NTpasswd to change the password of the built-in to a white administrator account. Download the bootable CD .iso image file, burn with third-party burning software such as free ImgBurn , Nero or Roxio. Burn as an image, not in the form of data. Start with the media that you have created. You need to maybe change the boot order in the BIOS or obtain a menu of boot command temporary with the pressure of a special key. NTpasswd will run. Follow the instructions carefully.

  http://home.eunet.no/pnordahl/ntpasswd/
  Then, go to the user accounts applet in Control Panel and set passwords that you remember and other changes. WRITE THE PASSWORDS DOWN AND PUT THEM SOMEWHERE YOU WON'T LOSE THEM.
  MS - MVP - Elephant Boy computers - don't panic!

• Recently bought Adobe CC, all applications are open in mode of trial requesting a serial number. What did I miss? I don't seem to have an activation code.

  I recently bought Adobe CC. Since then, applications open in trial mode asking me to basically enter a serial port or 'join' when I join, he says that I am already a member. How can I fix?

  Log, activation, or connection errors. CC, CS6, CS5.5

  Mylenium

• I am administrator on my computer, I forgot my password. I can not connect mode even without request even password (duh) I tried everything to remember. I can't. Please HELP: o

  I use windows XP

  Hello

  If you have another account administrative privileges in your system, then login and go to the command prompt

  At the command prompt, type "net user administrator *" without the quotes and press ENTER. It asks for a new password entered in and confirm the same.

  Sign in to the account administrator with this password.

  If this fails, you can try buying some records available online password reset.

  Saurabh yapi | E-mail address is removed from the privacy *.

• Why can I not make a continuous sampling of port 0 on USB 6216?

  I have a USB-6216 of NOR. I try to capture digital signals using port 0. However, the only way that I can function is samples on request. If I select N samples or continuous sampling, I get the following in the DAQ SignalExpress Wizard error message both Labview 2011. What I'm not doing correctly?

  Error-200077 occurred to the DAQ Assistant
  
  Possible reasons:
  Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.
  Property: SampTimingType
  
  Requested value: sample clock
  
  You can select: on request
  
  

  
  

  The 6216 not having a sample for the e/s digital clock as you can see from reading the specification, every time you try to use one, you will get this error message. Thus, in LabVIEW, whenever you want to do a reading, you must call a single value DAQmx Read mode single sample (or the DAQ Assistant, configured the same way). How many samples per second you take is going to be highly variable due to windows being nondeterministic.

• Reduce the period of sampling of the digital inputs of NOR-USB-6009

  Hello

  I need to read a line of digital input in the NI USB-6009 using NOR Express 2013 Signal box. I selected 1 sample (upon request) as acquisition mode. I need to define a smaller sampling period as 1 MS, but it gives error too short sampling period: "the current sampling period is too short.  Please specify a longer sampling period. ».
  I do not understand the reason for it and a way to slove this.

  Any help would be greatly appreciated!

  Thank you!!

  The 6009 doesn't have a clock that you can set for a sampling period. According to the specifications, the digital I/o is software programmed - sample on request you use now. I'm not at all familiar with SignalExpress but I don't think that you can find near a reliable khz sampling frequency on Windows or any other os non-deterministic.

• Generate N samples with NI USB 6501?

  Hi all

  I would use my 6501 NI USB DAQ (simple DAQ with 24 DIO) in order to generate a 16 - bit model. Using the DAQ assistant, I'm allowed to select "1 sample (on request)", 'Samples N' or 'samples continues. " But, unless I choose the first option, I get an error stating that I can choose only "1 sample (on request).

  What is a 6501 insurmountable limit?

  Thank you

  xdaf,

  Found this statement in the docs for 6501.  "All samples of the guidelines and updates lines are timed by the software.'".  I would say that it will only work in mode "1 sample on request.

• Sampling rate higher for the measurement of precision meter

  I have a BNC 6259 M Series DAQ USB. I am currently using the DAQ Assistant to perform simple cash rising measured with the measuring mode single sample on request. I tested my VI with a known square wave with a function generator signal and it clearly lacks a few edges. I think that the solution lies in faster sampling. However, I was not able to understand how to use clocks to set up continuous sampling mode. I tried the forums and I found articles that were close, but not quite exactly the problem I am facing with as (http://forums.ni.com/t5/Digital-I-O/trying-to-use-NI-6251-s-DIO-port-as-input-and-output/m-p/448035#...) or (http://forums.ni.com/t5/Multifunction-DAQ/Using-Counter-of-PCI-6024E-with-Quadrature-Encoder/m-p/984...). Any guidance here would be great.

  In fact, the calendar should not have anything to do with the edges being detected.  Configuration of a sample clock for a county of just edge task allows you to enjoy deterministically in the account register and has no impact on the edges which can be counted.  Also, the analog examples really have nothing to do with what you seem to be asking questions on.

  ... So it leaves the question unanswered as to why you might miss the edges.  Perhaps the following information could shed some light on the question:

  1. it is possible that you do not configure the counter exactly as you think you are.  Can you post the VI you use?  As a point of reference, count digital events shipping example does not use any clock sample timing and just questioned the value of the register count with a software loop, but the meter should not miss all this edge on the input source.  There are examples that are timed by the material available as well, but this is not necessary, unless you need a constant specified dt between your counter samples.  To use the examples of the timed sample, you will need to generate a clock of either another subsystem on the map or use an external clock.

  2. assuming that the configuration of the counter is not the issue, there may be a problem with the method that you use to determine if you are away from the edges.  How do you know that you are away from the edges?  The function generator produces only a finite pulse amount?  You start the meter before start out impulses?

  3. If the two points above do not raise red flags, it seems likely that the meter is registered just not some of the impulses of your FGEN.  Can I assume that the output of the FGEN is 0 - 5V TTL?  What is its frequency and duty cycle?  The maximum external source for the meter on the M-series products: DAQ (like the 6259) is specced at 20 MHz, but this depends on a clean signal with good connections.  At frequencies above it, the bandwidth of the front-end of the PFI lines becomes limiting.  If you have an available specification document for your FGEN I'd like to be able to see it.

  I hope this gets you throw on the right track to solve the problem - impatience comes back with more information.

  Best regards

• DAQ Assistant: Reading of the samples that are no longer available

  I'm trying to use the DAQ Assistant to read some data, but I get "error 200279 occurred at DAQmc Read (analog 1-d Wfm NChan NSamp) .vi:2.» The error message suggests to increase the size of the buffer, most frequently read data or by specifying a fixed number of samples to read instead of reading all the available samples. My sync settings are as follows: continuous samples for the Mode of Acquisition, 1 K samples to read, 1 K Sample Rate (Hz). I'm curious to know what would be the best settings for this. If I set the mode to 1 sample (on request), would simply take a sample each time the loop works? Help, please.

  Thank you

  Brian

  Brian,

  Please post on the Forums of NOR.  Adnan a reason on why you get this error. If you use the sample on request, you will get only a value returned for each iteration of the loop. If you only need to try from time to time and there is no need to be very consistent, then this might work for your applications, but it depends on what type of application you have. How fast do you need taste?

• USB 6008 DI sampling frequency

  Hello

  I would like samples N to a digital input on 6008 channel. In the port of GOT it, it is possible to put samples/channel and sampling frequency, but I couldn't find a way to do the same for the channel of DI.

  If I use MAX to read the N samples on request, I can increase or decrease the number of sampels to read but rates of mutation has no effect.

  using the:

  DAQmxErrChk (DAQmxCfgSampClkTiming (g_TaskHandle, "", samplesPerSecond, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, sampsPerChan));

  also gives me error.

  I don't know who do :-(

  Concerning

  RB

  Hi RB,.

  Digital I/o on the box USB-6008 are "static", meaning that they are controlled by the software. There is no sample clock to set the time a sample is read/written. Your software provides synchronization for DIO.

  Measuring mode 'Samples on request' refers to avoiding.

  Hardware timing (a sample clock) is available on most of the products OR providing DIO. As a low-cost product, the USB-6008 housing does not hardware timing for DIO.

  Best regards, Topp

• Single sampling Point Acq

  Hello, a little info on my system and I to start. I'm under LabVIEW 8.6 and using the NI USB-6259 box as my DAQ hardware. I'm new in the world of only having been LabVIEW use this configuration for 3 weeks (but a nice step to the top of the Win95 system I was using).

  I'm trying to order and circuit operating at 8 kHz. I want to read in a voltage of the circuit, detect a break in its derivative and then send the output voltage back into the circuit based on its signs at these crossings. To safely control circuit, I need to taste well above 8 kHz.

  The issue I'm having is speed limits due to a loop based around a DAQ Assistant of "1 sample (on request). I read a lot of messages saying to use timed HW sampling but I do not think that my DAQ hardware supports it. I used clocks to get a rough idea that my loop runs roughly 25 Hz.

  I don't know if the problem is in inefficient coding or limitations of my hardware and software. Attached, you will see my current VI.

  You're right, you use the acquisition of timmed softwared, you want to run in continuous mode, The 6259 should be able to acquire up to 1.25 MECH. / s.  Try to put it in place with the daq assistant since you're new to labview, or look at examples of analog acquisition.  essentially, you want to read in a loop using buffered continious CQI, then send the results to your vi loop or slave to the processor.   I would like samples at 5 - 10 times the 8 kHz to get a good representation of the signal you.  faster that the x 10 will give you nothing but too much data to deal with.  8 kHz is not too much data and you might be able to treat it in the same line as your read daq.

• How to write multiple entries with KHz sampling frequency in a file outside the loop?

  Hello

  I am able several entries of string tension using the wizard DAQ (1 sample on request) and it is placed inside a timed loop of frequency 1 KHz.

  This timed loop is placed inside an another while loop.

  Problem is with writing data to a file, although I can see 100 samples of 100 ms in the graphics cable to the out of the way, but the extent of writing to output file stores either only from 19 to 20 samples per second (when he wrote inside the timed loop) or does not store any (if placed outside the timed inner loop).

  I tried to set up producer consumer structure but in the loop of the consumer, I can't write the data in queue to a file saying data type mismatch. I placed the loop starting queue item and consumer out both loops and the element of queue inside the timed loop exit DAQ fed to the queue item.

  Can you please help me solve this problem file writing?

  I haven't looked so writing code from the top of the head, but access to the files is slow, and if you open and close the file, it is quite slow. What do you usually do it write to the file at a slower pace, for example once per second and write all the 1 k samples at a time. Try and also keep Ref file open during the test.

  /Y

• given high-frequency sampling one at a time

  Hello

  I'm using LabView 2011 for resistance measurements.  The express vi DAQ assistant is placed in a while loop and it acquires 1 sample (on request).

  Each sample is acquired, it is compared to a set point. If the resistance value is greater than the set value, a task is executed. If this is not the case, no action is taken.

  Now, I would like to increase the frequency of acquisition of say 5 kHz. As before, I wish the DAQ to give each value because it is acquired and compare it with the desired value.  However, only one point acquistion is limited by the speed of the while loop (which does not exceed a few Hz per second when I use the software-timer.)    If I use 'continuous samples' at 5 kHz, data acquisition does not give these samples one at a time.  It seems to acquire until the buffer is full and then released several samples at a time. It is therefore impossible to compare with the set value.

  Is it possible to get data at a high frequency and do compare to the set value, one at a time?

  The code is simple enough to do this.

  But the problem, it all comes down to how fast all of the other code in the loop takes to run.

  The first problem is that you use the DAQ Assistant, which provides a lot of extra load in the loop, especially if you don't set it up properly.  (And we can't say because no code is set to look at us.

  You should try a real code DAQmx where launch you acquisition continuous samples before the loop, acquire exactly 1 sample in the loop.  Then close the DAQmx task once the loop ends.  See if keeps.

  Why do you need to do this?  Note that all instant Windows might decide to fly a second or two and go and do something else like a virus check.  If you need at that moment (how exactly do you need that?), then Windows is not the right system for this run.