timed control loop
Hello I am trying to control some devices (triggers for other devices, etc) at given "absolute" times, not related to any other events. I consider that the best way would be to use the sample clock of...
View ArticleHow to reset counter with each iteration and how to introduce a delay
Hi everyone, First I apologize for the basic level of my questions, I am very new with Labview... I am reading counts off of a USB-6008 labview chip using the DAQ assistant and I write the output to...
View Article660x weak pull-down resistor schematic
The 660x spec sheet mentions that the Power-on state has a Input (high-Z) with weak pull-downs, but I cannot find a schematic with this weak pull-down resistor value. I want to measure a clock signal...
View Articlesynchronized counting
Hello everyone! I have the following at hand: I am working with NI PXIe-6361 X series Multifunctional DAQ and to it is connected SCB-68 I/O box. I also have TDC (sync) and CAD pulses from a testbench...
View ArticleNI-6602 acquistion delay and buffer overflow
Hi everyone,I am using a NI PCI-6602 to record photon arrival times. Basically, it counts the number of rising edges on the 80MHz sample clock that occur between two risingedges on the photon TTL...
View Articleerror 200329 reoccurring
I've been having an issue with getting error 200329 for my analog input into my NI Elvis board. The first time I got the error I left and came back to my Labview program the next day and the error had...
View ArticleNiveaux de tension entré carte PXI-6602
J'ai 108 délais de temps (un trigger et 108 signaux différents...) à mesurer (14 cartes PXI-6602). Je voudrais enlever un boitier ``buffer`` avec optocoupler entre signal et PXI (enlever une source de...
View Articlepci 5154 sampling rate
Hello, What is the max sampling rate of PCI 5154 for two channel inputs? The manual indicates the 2GS/s is for a single channel only. Then, am I not able to get a 1GHz bandwidth for simultaneous two...
View Articlelow cost sampling rate
I am currently using a usb 6008 to generate a pulse train. I seem to be able to generate it at 200Hz. What other hardware is availibe to do this?The usb 6210 will do this by using one of the counters...
View Articlestart acquisition at a certain time, and for a certain time
Hi every one,I want to start the acquisition every ten minutes for 30 second each.I thought about the while loop and timers but I'm not experienced enough to know how to do it.Labview 2009, please help...
View ArticleSyncronizing based on CO, retriggerable
I would like to synchronize AI, AO and DO finite tasks that are retriggerable based on a CO pulse train. I have set up a CO Pulse Freq task to run off ctr3 of my 9178 chassis. The rising edge...
View ArticleCounter output, on demand
I'd like to have a counter output a single pulse whenever a condition occurs within a loop. My current solution (in pseudocode; I use LabWindows CVI on a RT target) looks like this:...
View Articlepulse train from encoder
Hi,I am attempting to generate a pulse train to trigger a camera using an X4 quadrature encoder with A, B and Z index, the Ni 9401 and the NI 9172 chassis. My encoder generates 2500 pulses per...
View ArticleOnboard Timing with Daqmx on PCI 6132
Hello, My collegue and I are trying to make a program in Labview 2012 that starts a timer when the first trigger(sensor) is hit and stops the timer when the second trigger(sensor) is hit. We currently...
View ArticleCounter Out task, initial delay, and commit
I don't know whether it's a bug, a feature, or me not understanding how to do things correctly.I create a counter-out task with DAQmxCreateCOPulseChanTime, with an initial delay. Then I set...
View ArticleSampling rate of Pressure sensor
The code attached shows an encoder triggering the pressure sensor on A pulse. Encoder has 1000pulse per rev. I am able to trigger the sensor, but I finding it dificult to sample it with respect to the...
View Articlemeasurement digial input or analog input
Hello, I am trying to measure frequency using NI DAQmx task and then convert this to an RPM if at all possible. I have the following hardware . I have NI DAQ-9174 with the DI (NI 9421) modules (8...
View Article6014 board problems with counter 0
Hi all, I'm working on a project with a 6014 board and Real-Time Windows Target of Matlab. I need to interface the signals from two incremental encoders. The qudrature signals are converted into a...
View Articlehow to measure rpm
I have an NI 9401, labview 8.6 and a 9172 chassis and I am trying to measure the rpm of my rotating shaft. The code I wrote works at low speeds but is not accurate at high speeds. Does anyone have a...
View ArticleWhat is error 50103? at DAQmx START task?
Hi,I am using cDAQ 9174 with NI 9401 to measure encoder period. I have two encoders, and learned that I need to have a separate task for each. Initially, I got an error telling me that the task was...
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