Measure voltage low frequency

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• static/digital waveform output and low frequency measurement of voltage - SMU-6358

  Hello

  1. I have an attached VI [digital_voltage_output] who must generate a logical true or false static state in the output of the device/port0/line1 Word to say. When the VI works I click the button several times, but nothing happens to the port0/lines1.

  2 such a thing [digital_voltage_waveform_output_square] if I'm trying to generate a digital waveform to pin the same with the waveform generating VI. If I connect a waveform chart to the output of the generator function VI, then the chart will show me the good waveform I want, but still nothing is written to the text file.

  3. I have read the manual for the X series cards, but it remains unclear for me a little how to things of the road in LV I have a measure of the frequency measurement VI low frequency that I downloaded. It offers me the ports for the supply frequency - ctr0, 1, 2, etc. As far as I'm concerned the PFI ports are responsible for these types of actions. How can I find out the LV that I want to connect say ctr0 and pfi0? »

  I use LV 8.6.

  Thank you

  Kriváň

  Hi Kriváň,

  The problem you had with the choice of a specific digital line as a physical channel, is that the control that was previously used in this example was created for a data acquisition task that uses a whole port rather than a specific line. I was able to overcome this problem by removing the control and recreate. The control now gives you the option to choose the specific digital lines e.g. port0/PXI1Slot2/$line0.

  I was also able to overcome the error of-200802 you mentioned. I was able to do this in a real constant of wiring at the entrance to auto-start the VI DAQmx writing then remove the DAQmx beginning the subsequent code VI. The modified code is attached.

  I hope this helps.

  Best regards

  Christian Hartshorne

  NIUK

• NEITHER USB-6343: erratic low frequency 1 counter measures

  Dear members,

  I'm looking for help with a measure of low frequency counter.  I tried to make it work for a week or two, but I keep getting erratic measures.  It will read the rpm properly for a second or two and then it will give a ridiculous value on the order of 10,000 times the correct value. I can not get a constant value.

  I use a DAQ series X NI USB-6343 multifunction with Geartooth Honeywell GTN1A111 sensor. I enclose a sketch of the wiring configuration.  I think that it is correct.  Sensor output to the door of the meter.

  To try to solve this problem, I hooked the sensor to an analog input channel to make sure that I was getting a TTL signal by sensor.  I noticed every once in a while I'd see a glitch of little noise in the signal and I guess that's what is causing my problem with the meter.  I inserted two waveforms of the sensor signal (one with the clean signal) and the other with the glitch of noise.  My understanding of a TTL signal meter channel will examine LO voltage when it is below 0.8V and HI when it is larger than 3.8V.  So I really do not understand why these little glitches could be the cause of the problem because they are well below and above 0.8V and 3.8V, respectively.  I think that the noise comes from a frequency converter used to drive the engine.  I tried the system as much as possible of the Earth.

  

  

  I guess I'm looking for another approach.  I could potentially use a digital filter to help with noise? The glitch is in fact the problem or I forgot something.  The VI in question is attached.

  Thanks in advance,

  Mike

  Have you tried to set up a digital filter yet?  Obviously the seeds are collected as an additional transition (the method of low frequency counter 1 measure the period and then reverse, so a short glitch would record as a very high frequency).

  You can enable the digital filter with the following property node:

  

  Min pulse width is guaranteed pulse past the filter, so it should be low enough for the real signal is guaranteed to pass through (but high enough so that the glitch is always rejected).

  Best regards

• Can I use 6115 measure DC or low frequency signal

  I use 6115 OR data acquisition if put singnal superior to 100 Hz, the result is very good.

  But if the frequency below 10 Hz, the result is not fair.

  I try MAE and choose the DC coupling mode, it still can not measure DC signal.

  What can I do? or the NI6115 can measure just the DC or the lower frequency signal.

  Thank you

  Hi xsfl,

  Please try the other channel. I wanted to ask, what are the characteristics of your signal? What is a sinusoidal signal, how often, what range of amplitude? Also, have you been able to measure low frequency signals before or is this the first time you try?

  Also, remember that you are above the minimum rate, 20kS/sec, sampling sampling as to the care.

• Memory running at a lower frequency

  I recently added 1 GB 667 DDR2 ram to my office, a1514in Pavilion (previously 1 GB 667 stick). But now the bios is show my DRAM frequency as 266 MHz (PC2-4200), these are the cases with different configs:

  -If I put only OLD stick of 1 GB 333 MHz (PC2-5300) show

  -If I put only NEW stick of 1 GB it will show 266 MHz (PC2-4200)

  -If I put both OLD & NEW 1 GB stick will show at 266 MHz (PC2-4200)

  Has also tried different machines slot but no use (I have only 2 slots and memory support for my system max is 2GB BIOS version 3.24)

  I am not able to understand what the problem is. In CPU - Z under the SPD, the two sticks are showing similar settings (I have not so good idea on these parameters). Please help me why the new RAM runs at a lower frequency... What should I do?

  Hello Khot
  
  What is the model of your Samsung of RAM stick?
  
  According to the specifications of your motherboard RAM supported, speed isn't PC2-4200 and PC2-5300.
  
  Another thing, usually by mixing different RAM is a bad idea. The reasoning is that each RAM stick is intended to be run at a specific frequency, timings and voltage. If two sticks use different frequencies, timings, tensions that the BIOS will be all run the highest common denominator. In your case, that your new stick of RAM PC2-4200 and, therefore, the BIOS reads your second stick is run at the same speed for stability purposes.

• low frequency with labview 2010 auto and agilent 35670a

  Hello

  I work on the automation of low-frequency measure a 35670A Agilent. I currently did a program that allows a measurement with an average of FFt given a frequency bandwidth and frequenct from beginning, see picture attached, but I try to measurement of spectrum using this power VI ( ), but unfortunately I can't seem to find how to convert a signal from my block diagram below in order to send the input signal power VI above spectrum X no indication or help will be appreciated.

  
  

• Meter very low frequency using PCI-MIO-16-4

  Hello

  I am trying to use a card PCI-MIO-16-4 with BNC-2090 to CI FREQ. Because the sometimes less than 1 Hz frequency of our leaders, or even no time measurement taken, the vi program always shows "Error-200527" and tells me that the min frequency must be greater than 1,192 Hz. If this card cannot measure very low (even zero) frequency in time measurement taken? If it is possible, how? Could you show me some examples? Thank you very much.

  Damien

  What method of measure do you use to measure your rate?  You are able to assign at least 0 (default) to 2 that would be the rounded version of 1,192.  Alternatively, you can try to use one of the other methods to measure and see if that helps.  All these values can be set with the channel to create VI.

• noise in the measurement of the frequency by using a counter

  Hi all

  I use a card 6602 for measurement of the frequency mode "bufferred range with 2 CTR", the signal of interest is a signal TTL of ODA, however, I got a signal as shown attached. It seems that the noise level varies with the level of the signal, y at - it a good way to eliminate this noise? Tried with digital filter, but it does not throw an error 200774. It seems that the source of the selected counter is set to default 'No Filter'. And I think also to use a bandpass filter, but given that the level of the signal changes (~ 300 Hz - ~ 300 kHz), high and low limits are not easy to define.

  Thanks in advance!

  Best,

  L.

  
  

• Satellite A215-S7444 - name of the low frequency amplifier

  I need to know the name of aplifier of low frequency in a Toshiba Satellite A215-S7444 main laptop Board. I have problem with my speakers because they beep. And the problem is with amplifier speakers.

  Please tell me the name of this integrated circuit.

  Hello

  I think that no one here can answer this question because it s only a user to user forum and I have never seen anyone from Toshiba here. I think that this question can be answered only authorized individuals.

  I recommend you contact an authorized service provider. Technicians could answer this question and help you get a new spare part.

  Good luck!

• Low-frequency shaking sound when the backlight is disabled

  Very starnge.  It only happens for some MP3 song, and when the backlight turns off, I hear that very clearly some low-frequency (about 3-4 Hz) sound poping out.  Once I press a button and the backlight was on, pop vanish.

  Yes, after changing the EQ for 'Rock' to 'Normal', the problem is resolved.  I don't even have to use "custom" for the equalizer.  This problem makes me very carefully listern for the background music/noise.

• Error-200141 with low frequency counter measures

  Hello

  I'm trying to measure the speed of a rotating shaft using a laser tacho Keyence and a counter on my PCI-6601 entry.

  I can't reach my vi, but I join a PNG of the section of code.

  Background:

  -L' tree turns to ~ 6000rom

  -The counter is updated frequency measure ona climbing on board.  There are 9 rising edges per revolution of the shaft.

  The problem:

  -If I put the vi to capture a small number of samples, it works very well.

  -If I put the vi to measure the samples more 200141 occurs error "data has been overwritten before it can be read by the system.

  -The number of samples, I can get without problem varies.  200 seems reliable enough.  Sometimes I can get 1200, sometimes 600, sometimes 150.

  -I would like to be able to get samples of ~ 2000.

  -If I try to get samples continuously, I encounter the same problem.

  If anyone can help with this problem it would be greatly appreciated.  This is something I continue to flow upward against but so far have been unable to rectify.  I'm sure I'm missing something, but I have no idea what.

  Thank you very much

  Martin

  version 8.2

• Measures voltage and temperature with 6221 and USB TC1

  Hello

  I make a program to make measurements of voltage with a card PCI 6221 37 pins Council and measures temperature with a USB-TC01. I use Labview 2009 SP1 and basically my program reads the data, it displays in a table and records in a file, all at a time which runs in a loop until I have to stop the program.

  The program is closed. I wasn't too sure about timing with the 2 devices. The tc01 works at a fixed rate, so I put DAQmx read 1 Chan 1 Samp. On the 6221, I defined a sampling frequency and chose to not 'continuous samples', set DAQmx read 1Chan Nsamp and 'samples to read' the value "-1".» And it seems to work fine, but only if 'samples to read' - 1 seems too easy. I'm missing something. What determines the speed at which the loop runs?

  Thank you

  Try putting a wait function (ms) in the loop.  Set the value of waiting for 100 to 1000 ms.  If everything goes faster than that, then the wait will determine the rate of the loop.

  Lynn

• Measurement of low-cost input analog (4-20mA) with data acquisition

  Hello

  I would like to have a very low cost measurement system loop which I can plug in my laptop current:

  I have a load, which is connected to a circuit of air conditioning/signal booster, which output a 4-20mA. I want to measure this current loop signal.

  An idea for the lowest cost system? I think that the most NOR DAQ are too expensive and too exaggerated.

  I have LabVIEW.

  Use of remote sensing current low-value resistance, then measure the fall of voltage through it with the help of an acquisition of data 6008/6009?  They have about $150.

  You will probably need to amplify current-sense with a MAX4372 or similar resistance to achieve a result that allows you to use a reasonable scale on data acquisition.  I measure the current through our products in almost all of our equipment to test in this way.  The size of the resistance of meaning as a result.  The 6008 is accurate enough, but it is not the fastest nor well presented.  But starting at $ 150, they are hard to beat.

• Analysis of low frequency - great obstacle, easy solution

  I'm trying to analyze a signal between 0-2 Hz. The signal is a clean sine curve where the amplitude and frequency changes.

  I wanted to use the ExpressVI which is called "Your measurement" as I am not that experienced with Labview.

  I used a signal generator to simulate, and it seems that it works very well for signals above 10 Hz. lower than that returns the high frequencies and amplitudes of false.

  Please help me out here. The signal I'm generating is sampled at 100 Hz, with n = 10.

  

  

  Well, I sort of figured it out by reading my own question. Increase the number of samples done...

• Voltage and frequency of the high processor Y500

  Hello

  I have problem with high CPU frequency and voltage when set on high Preformance, frequency exceeds 3.2 GHZ and the voltage is 20 + VAT, even if the CPU usage is 0 to 10%.

  I will be grateful for some advice and assistance.

  Well, high-performance forces the computer to High Performance. Try rather balanced.