Frequency problem in input-output control loop, LabviewRT
Hello,
I want to write a cotrol loop in LabView real-time. My target is to acquire a data from 5 channel in frequncy about 100 kHz, integrate the data and send them to the output in frequency about 10 kHz (every 10th sample). I made twou time-loops. One for acquiring and integrating, second for sending them to output. This loops are connected throug the rt fifo.
My problem is with a speed of acquisition. When I use "Hardware-timed single point" for acquiring, the result frequency is about 50 kHz. Continous sample and finite samples give me the desired frequency, but the output is not in in the same time as input (output waits until the input collects all data). Is there any problem with communication with the input and output channels in the same time?
My Hardware:
Computer: NI PXIe-8108 in NI PXIe-1062Q
card: NI PXIe-6358
My vi is attached
Attachments:
rt_headless_v1.2.vi 133 KB
Dear Kocman,
thanks for including your VI, it is useful to understand better your application.
However, the detailed requirements are still not entirely clear for me.
I think, starting with the right architecture and proper timing and synchronization schemes could save you a lot of effort while they ensure proper operation.
First, it should be defined what kind of timing your application requires. More specifically, if it needs to be hardware or software timed.
From your description it sounds like you would need hardware timed aquisition synchronized with generation, although your code tries to implement it using timed loops, which are inherently software timed.
You can find some useful additional information about the two methods and a nice white paper about synchronization techniques here:
http://zone.ni.com/reference/en-XX/help/370466V-01/TOC11.htm
http://www.ni.com/white-paper/4322/en
Probably it helps to review them or even try to test some of the methods to get a better feeling about it.
I hope this helps you to get to the proper solution.
Best Regards,
Adam Cseh
Applications/Systems Engineer
National Instruments
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Hi
Using Labview 7.1 and PCI 6071 DAQmx card i want to design a frequency sweep application. I mean that i need my analogue output channel to give a sine wave with incremental frequency of 100 Hz step, starting from 10000 Hz untli 100000 Hz (10000 Hz, 10100 Hz...100000 Hz). This wave is applied on a kind of a transformer, and each time the frequency changes, i need an input channel to acquire another also sinus wave coming from this transformer and measure its amplitude, in order to examine its frequency response. So, i came up with the attached vi.
The problem is, that when "sweeping" takes place ,i get amplitude values between 2 and 6 or even 7 volts something that can't be happening. I know that the amplitude values i should get are around 2 volts (+/- 500 mV maximum).
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Attachments:
sweep3.vi 140 KBHi
Please take a glance at the two attached vi's.
The first is the one i use in order to generate a steady frequency sinus wave,feed it to my transformer and acquire the also sinus output of the transformer through my input channel. Using two channels of an external oscilloscope i check and notice that for many frequency values, both sinus waves are steady and noiseless, with the expected amplitude voltages.
Now, using the second vi, in order to "sweep" the wave and check my transformers amplitude response, then these impossible amplitude "up's and down's" again came up.Again by looking at the oscilloscope's screen i can see the noisy waves tha "confuse" and the oscilloscope and my input channel, and so result in wrong amplitudes.
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I'd really use some help, or maybe even ideas for different design approaches for the frequency sweep.
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break;
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}Any pointers/tips/solutions/angry posts to tell me to stop trying to learn Java would be greatly appreciated.
Thanks in advance!
Oh, and in trying to work with it a bit further I realised I'm having a few problems with runtime errors due to exceptions. The first was due to the array being assigned out of bounds (fixed in the above code). But the second reads the following:
Exception in thread "main" java.lang.NullPointerException
at Loadingsaving.load(CaseStudy.java:330)
at QuizResults.(init)(CaseStudy.java.259)
at GUI.(init)(CaseStudy.java:34)
at CaseStudy.main(CaseStudy.java:15)Not quite sure what this one means or how to handle it. =\
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Sir/madam,
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I am currently working on an application where i have to generate a pwm to control the ON time duration . The pwm ON time depends on the frequency of an input signal.I want to retrieve the ON time value from a lookup table which contain the duty cycle values for the pwm at different frequencies of the input.This input also has to work as a trigger. The input is pulsed and the trigger has to generate the pwm at every rising edge. I am using a PCI 7831R- RIO series. I am urgently in need of some help and i have hardly a couple of weeks before i meet the deadline.
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Developing a PWM Interface using LabVIEW FPGA or PWM Output with LabVIEW FPGA
How this helps.
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AE
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Attachments:
Smith predictor for real control.jpg 517 KBHey Pablo,
To achieve the behavior you want - where a single step is executed for each step of a while loop you should use a single-stepped simulation subsystem (http://zone.ni.com/reference/en-XX/help/371894G-01/lvsimhowto/sim_h_subsyssa/) instead of using the CD+Sim loop. This will let you configure your code to run just one step per while loop iteration.
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Regards,
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Both modules appear to be available -
ls /lib/modules/$(uname -r)/kernel/arch/x86/kernel/cpu/cpufreq/
acpi-cpufreq.ko.gz gx-suspmod.ko.gz mperf.ko.gz powernow-k6.ko.gz speedstep-ich.ko.gz
cpufreq-nforce2.ko.gz longhaul.ko.gz p4-clockmod.ko.gz powernow-k7.ko.gz speedstep-lib.ko.gz
e_powersaver.ko.gz longrun.ko.gz pcc-cpufreq.ko.gz powernow-k8.ko.gz speedstep-smi.ko.gz
Last edited by belbo (2011-06-11 11:07:50)
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