absolute frequency

Similar Questions

• NEITHER 9237 quarter bridge absolute accuracy

  Given a NI 9237 bridge completion Module with NI 9944 accessory Terminal strain gauges and 120 ohms with GF = 2.11, how calculate we precision of strain?

  I was told that the absolute accuracy for bridges of quarter is given by

  Absolute accuracy = (Gain error * reading) + (error offset * range) + noise + half bridge watchkeeping tolerance tolerance.

  Since I'm on the NI 9944, watchkeeping tolerance would be 500 uV/V (given by OR R & D). The tolerance of half bridge is given in the manual OR 9237 being 1.2 mV/V.

  (1) it has no value of 'Noise' of entry for bridges on watch in the NI 9237 manual; We use only the sound of half-bridge?

  (2) if I use a sample rate of 1,613 kech. / s (the rate guaranteed valid sampling for the NI 9237 module) and my system is always in his 1st year of use, always is my gain error 0.05%? It is worth noting that 0.05% applies to the 50 kech. / s ; If the gain error does not apply to my low sampling frequency, how can I find the error of gain?

  (3) if my maximum/minimum deformation measures around 600 EU (microstrains), how can I change my values "Reading" and "Range" in the equation for absolute accuracy above, if they need to be adjusted?

  (4) why the absolute accuracy for a quarter-bridge set up does not include the half bridge tolerance?

  (5) is the equation for the conversion of precision of voltage precision for quarter of a bridge, of the strain , where U is the precision of the voltage given by the equation of absolute accuracy above.

  Example of calculation using the values assumed for quarter-bridge:

  Error error/gain Offset = 0.05%

  Reading distance / = 25 mV/V

  Half bridge noise = 1.6 mV/V * 3

  Half bridge tolerance = 1.2 mV/V

  Tolerance of watchkeeping = 500 uV/V

  Absolute accuracy = (V/V 0.0005*.025) + (0.0005*.025 V/V) + ((1.6e-6) * 3 V/V) + (1.2e - 3 V/V) + (500-6 V/V) = 25 mV/V +/-1.73 mV/V

  Accuracy of the strain =-4(V/Vex) / GF (1 + 4 (V/Vex)) = - 4 * (25 mV/V +/-1.73 mV/V) / (2.11) * (1 + 4 * (25 mV/V +/-1.73 mV/V))

  How to simplify this precision of strain to get a reading + / range of precision?

  Thanks for any help.

  (2) if I use a sample rate of 1,613 kech. / s (the rate guaranteed valid sampling for the NI 9237 module) and my system is always in his 1st year of use, always is my gain error 0.05%? It is worth noting that 0.05% applies to the 50 kech. / s ; If the gain error does not apply to my low sampling frequency, how can I find the error of gain?

  This applies at a rate of 50 kech. / s. lower data rate can have up to 0.20% gain additional error reading.  This can be found on page 24 the unit operating instructions and specifications document

  You get to know how to calculate what percentage of Reading (Gain error) I'd get according to what sampling frequency use? Otherwise, I guess I could use the error of gain of 0.20% in the worst case scenario.

  Yes, I so calculate the error of Gain for the worst case scenario (0.2%)

  (5) is the equation for the conversion of precision of voltage precision for quarter of a bridge, of the strain , where U is the precision of the voltage given by the equation of absolute accuracy above.

  Yes, I think it's the correct equation.

  It is more a matter of math - since you will be in the form of a reading + / a range (for example 25 mV/V +/-1.73 mV/V), do you know how I simplify or interpret the accuracy of strain after its replacement by the U-value?

  Accuracy of the strain =-4(V/Vex) / GF (1 + 4 (V/Vex)) = - 4 * (25 mV/V +/-1.73 mV/V) / (2.11) * (1 + 4 * (25 mV/V +/-1.73 mV/V))

  Just reuse the worst cases to calculate positive and negative values on 1.73mV.

• Frequency domain scaling graphic of waveform

  Hello world

  -I m buying a random voltage signal using a sampling rate of 200 kech. / s on my device NOR and trace the signal acquired on a waveform graph (Figure 1-a). After tasting the random voltage signal my Labview VI also calculates the PSD (power spectral density) of the random signal acquired and it is plotted on a waveform graph (Figure 1B). As the sampling frequency used was set at 200 kech. / s, the maximum value on the x-axis of the curve of PSD´s waveform should be 100 kHz (Shannon´s theorem). When Labview trace PSD´s waveform graph, the maximum value appears as 1. Is it possible to scale the chart of PSD´s waveform in order to define the maximum value on the x-axis as 100 kHz?

  Thank you in advance,

  Best regards!

  Of course, your numbers of the scale correctly and use a property of the range axis node x (your pdf says absolutely nothing about your program or your problem with it. Code would at least tell us something.)

  Cameron

• How current function (frequency) of the output to the last value in HP8510c

  Hello

  I have been using HP8510c for the calculation of the Q factor, the problem is, I need every S21 801 frequency values I get the raw data, in order to get the loaded Q factor.

  I use the STIMULUS as "RAMP" just for your information, which is also the default option.

  I couldn't understand this so, what I thought to do was get the frequency start and end and he interpolated between 801 points.

  Now I'm using vi 'Ouput function Active' that displays the value of any function, I chose. So if I select start and use this vi, he's going to show me the frequency of 'start '. But the problem is that the I don't get the whole figure.

  If it appears on the screen

  START = 4.46647456635 Ghz

  It will be output as

  4.46640000000 Ghz

  It is not that the GPIB bus truncates the data, I feel that the HP8510 firmware is configured to do this. What is another way by which we can get the value of the exact frequency?

  The accuracy is ideal for the accurate measurement of factor Q.

  LabVIEW does not otherwise deal with him. Your VI isn't close to being correct since you connected the County return since writing to the entrance of count bytes to read. There is absolutely no connection between the number of bytes you write and the number of bytes that the instrument will return. The number of bytes of the value to a number and see if it starts to work magically.

• DAQmx task Read DAQmx with sampling frequency of 10 Hz produced much too much data

  I have a simple configuration with a strain of channel 4 OR-9237 amp holds a carrier of series C of WLS - 9163 (wired ethernet mode) - Details probably does not matter.

  I used MAX to create a DAQmx task associated with which all four gauges samples.  The calendar setting is "Scan Loads" is continuous sampling, 2 k buffer (read samples) and 10 Hz rate.  I guess that this task would generate 40 data values per second - 10 for each channel.

  I have a simple loop of reading using DAQmx Read.vi that works always (without any stimulation time).  Playback is set to read all available data and then pump it into a table.
  In the attached example, I also added a few words of debugging to stop the loop after N iterations.

  As the loop is programmed with a 0.2 second period, I expect each pass of the loop to read about 8 samples or 2 samples per sensor.  Instead, I get hundreds each passage.  It's like reading has substituted the sampling frequency specified in the task of the unit.  I absolutely need data to be material to the rhythm.

  Where have I lost?

  Thanks Adnan,

  I changed your example I selected 'Strain gage' entry analog and then lowered the minimum and maximum thresholds to +-1-2.  What happens is that each other in the loop, I 2048 samples or zero samples.  The display flashes a whole line and then it clears any other past.

  In response to your second post, I understand that the loop cannot run quite right that I select.  I think that, but at a sampling frequency of 10 Hz, I have to sleep on the software side for nearly a minute before I built 2 K samples.

  I played with the frequency of sampling, assigning to various values from 0.1 to 10000Hz.  The behavior is the same until I approach the high rates where available samples remains to 2048-4096 sometimes, the display becomes continuous.

  Ahhh, Darn.  Yet another search was this link that points to the root of my confusion.  The 9237 can taste arbitrary rates using its internal clock.  Duoh!  I wish that the pilots are smart enough to warn you if there is a discrepancy between the selected sampling rate and capabilities of the device

• How to reduce the noise/smooth and frequency diagram

  Hello! I have a text file that contains a signal. I had read in a format of waveforms and trace the signal in the time domain. I then put the waveform to the PSD vi so graph of the waveform in the frequency domain. This chart has a lot of noise in it so I want to have a smoother graph.

  One possible way to smooth out the graph is to take the average of a few points each time interval and graphic news values. So I took the time signal and divide it into tables (time) x and y (amplitude). Then, I took the Fourier amplitude and took of the absolute value of it.

  From there, I'm trying to create a design where I would have the average of the values of fourier transform taken every 3 points and then add these points in a table. I would then draw this new table, spaced between 0 and the end point of the original frequency graph, which has a more smooth.

  My drawing went horribly wrong, however. The graph resulting goes crazy while drawing a straight line, and I'm also not sure how to have the points evenly spaced to the end point of the graph original frequency. So I have attached my vi and my signal text file and I was wondering if someone could help me solve this problem. Thank you!

  Yes, he was wrong.  You create a series of paintings to increase the length and the value of constant.  A filter for smoothing of 3 points is easy to implement with a shift register.  See the image below.

  Lynn

  

• Alternating - Signal Express sampling frequency

  Hi, Im trying to get data using Signal Express + NOR USB-6211, I put the sample rate to 44100 Hz. and everything seems to be ok, but when I checked the data I realized this time column does not increase in a period time constant (ie. sample FREQ not fixed).

  For example:

  1 / (Time (1) - Time (2)) = 43478,26 Hz.

  1 / (Time (2) - Time (3)) = 45454,54 Hz.

  and it constantly alternates between the two frequencies. I have to perform an FFT and Im not sure what is the actual frequency and which continues.

  I appreciate any help on this issue.

  Kind regards.

  This seems to be a bug that NEITHER should be aware of if they are not already.

  If you set the frequency of sampling to 44100, the actual sampling frequency will be (20 MHz / 453) or ~44.150 kHz.  The USB-6211 case has a basis of TIME 20 MHz (±50 ppm) and this clock is divided by an integer to derive the sample clock.  The sampling frequency is always be forced to match to the top if you choose a rate that can only be achieved with a wide divider.  Regardless of what the file shows, map DAQ itself samples at a uniform rate (unless you use an external clock, or something like that...).

  As for the behavior in the column duration... I know exactly how you look at it but I get the same behavior is written my data using 'absolute time' for the time column to an ASCII file (or by using a file LVM, which always uses the absolute time).  With the help of 'on time' however gives me a correct result.  I can't speculate on the cause... it seems likely to me that there is a comma floating rounding error (absolute time is in terms of seconds since 1904, so the software works with a large number at the same time requiring great precision).

  Best regards

• Entry of absolute encoder PWM w / 6008

  Hi, I'm quite new to the DAQ world so please be easy on me.

  Well basically, I have acquired a free 6008 and want to use it to track the absolute deviation of angle of a device I have.

  My scope involves the use of a labtab (USB only), as well as a range of measurement 0-90 degrees with an accuracy of 1 degree at most.

  So I came to the conclusion that I have to get an absolute encoder.

  Watching the encoders and their respective exits, I found the following: SSI, Linear Voltage (0-5 Volts) and PWM

  I have falling SSI my list because it seems a PCI data acquisition card is a requirement, and the linear voltage is all simply not precise enough, because the encoder outputs (0.056 volt/deg) and the 6008 can be read only with accuracy intervals (0,138 volt). Which means (2.484 degree/interval), I think.

  in any case, the last style of output that I found was the PWM signal.

  The encoder http://usdigital.com/products/encoders/absolute/rotary/shaft/ma3/

  If I have good outings (at intervals micro-sec 1026), where the duration of the pulse is the position of the encoder. (1026 counties/revolution).

  So I guess I have to be able to read the pulse of the order (1 micro-sec) for (1 head).

  My question is whether or not the 6008 is able to acquire the data for my use in LabView.

  Counter the 6008 says its able to detect more than (0,1 micro-sec) pulses.

  Does this mean the 6008 so capable of doing the job?

  Any help is grateful, as I have very little experience with LabView or DAQ instruments.

  Thank you.

  It is a limitation just to the meter of a USB-6008.  What you describe with 2 counters is actually very close to what we do for measures high frequency on our complete recommended counters.  The pulse actually measure that requires only one meter on our E-series, M-Series devices, meter Timer and X-series.

  In regards to the analogue output of the absolute encoder, I think you should be ok with the resolution.  The output of the encoder is 0 to 5V.  The typical accuracy on the 6008 for this interval is 4.28mV for differential connections.  Step for each degree size is 5 /(2^10) = 4.88mV.  Thus, it seems that you will be able to get a precision less than 1 degree.

  If you need better accuracy or would prefer to make the PWM output type, I would look at our M-Series USB for a portable data acquisition solution.  Let me know if you would and I'll give you a few recommendations.

  Regads,

  Paul C.

• compatibility with 802.11n to 5.0 GHz frequency

  Is the Thinkpad W701 (2541 CTO) compatible with 802.11n to 5.0 GHz.  I tried, it can not find the network to 5.0 GHz frequency. Please notify

  No, unfortunately, it does not support any operation at 5 GHz:

  http://www.Realtek.com.tw/products/productsView.aspx?langid=1&PNid=21&PFID=48&level=5&Conn=4&ProdID=...

  Frankly, I do not understand why Lenovo sells even such a laptop with nothing less than the Intel 6300 or 6250 WiFi cards. When you configure a W701 for the purchase, the link "Help me choose" for the WiFi cards:

  http://shop.Lenovo.com/SEUILibrary/controller/e/Web/LenovoPortal/en_US/SystemConfig.Runtime.workflow...

  tells customers absolutely NOTHING on the map "ThinkPad bgn wireless" that Lenovo offers for sale with the machine. Is the closest they come to discuss the "ThinkPad 11 b/g Wireless LAN Mini PCI Express Adapter III" which is any other card having different abilities. Any more than they do not mention something on the Intel 6300 or 6250 cards provided with the machine. But they do not address the card Intel 4965AGN, which was sold 2-3 years ago and is no longer offered.

  In short, link to "Help me choose" of Lenovo is totally unnecessary, and this has been a recurring problem on Lenovo configuration pages. Apparently, Lenovo has no one who is able and willing to re-read their configuration pages, and I see frequent complaints in ThinkPad forums about this.

  The Intel 6300 and 6250 support 802.11n at 2.4 GHz and 5 GHz operation. You can replace your existing card by one of them, but instead of paying $30-50 or more to buy the card online retailers, you will have to pay extra (generally $ 150-200 for the WiFi cards) rather buy the map directly from Lenovo, because otherwise the computer will not start.

  For the best WiFi, buy the Intel 6300. If you want to than WiMAX, which is a 4G service in some areas, instead buy the Intel 6250, although the 6250 WiFi performance than the 6300 has.

  Moderator edit: fixed formatting, a link.

• How can I absolutely clear everything, including updates of my watch

  How can I absolutely clear everything, including updates of my watch? training app stops randomly. Have tried all of the suggestions. First update to 2.2.1 to 2.2.2 problem. disconnection and several updates to 3.0 did not solve problem

  Hello

  Unpairing erase all content and settings of your watch.

  If you have tried all of the suggestions (see previous questions) and continue to have problems, the following steps may help:

  • Cancel the twinning of your watch by using the app Watch:
    • Cancel the twinning of your iPhone - Apple and Apple Watch Support
  • Make a backup of your iPhone:
    • If you use iTunes, be sure to choose the option encrypt iPhone backup.
    • The backup of your iPhone, iPad and iPod touch - Apple Support
  • Restore your iPhone via iTunes (install a new copy of iOS) settings:
    • Use iTunes on your Mac or PC to restore your iPhone, iPad or iPod settings - Apple Support
  • Restore your iPhone from backup encrypted;
    • Restore your iPhone, iPad or iPod touch from a backup - Apple Support
  • Associate your watch, set up either as a new watch or restore from a backup:
    • Set up your Apple Watch - Apple Support

  If the problem persists, I suggest you contact Apple technical support or make a Genius Bar reservation for assistance, including to have your watch checked whether recommended by Apple:

  • Contact - Support official Apple
  • https://Twitter.com/applesupport
  • http://www.Apple.com/retail/Geniusbar/

• How to move cells containing formulas without absolute references and maintain cell references

  I know about the selection of the absolute references, etc., but sometimes I'd like to be able to copy a group of cells with formulas and paste elsewhere all retaining the original cell references. For example, several cells with a formula referring to 'A1' continue referring to 'A1' even when I copy the cells elsewhere.

  Is there a change of copy and paste (for example, command + option + C or something?) so that I can copy the same that in Excel, that does not change the cell references when you copy a formula elsewhere?

  Thank you!

  Hi jivejive,

  I am not in anyway you want with a group of cells. I did it with individual cells by copying the function since the Inspector formula and then paste in the Inspector in the new location.

  Quinn

• Radio frequency for associated relay Netatmo Thermostat change

  I have been told by Netatmo to change my Thermostat Netatmo associated relay Radio frequency as there seems to be problems with interference causing the relay to stop working. Can someone tell how can I do that. Thank you very much!

  In airport utility, go to the wireless tab... from options wireless at the bottom of this page and then you will see the wireless channels

  

  

  I put the 5 GHz channel because she was using a channel in Australia which is BAD.

  Personally, I doubt that this will fix your problem... It is more likely caused by too wireless signal around you and the TC as a poor place.

  Use simple... No, apple names recommended... anyway, no spaces and pure alphanumeric characters and also pure alphanumeric passwords.

• Percentage of maximum CPU Windows 7 constantly frequency > 100%

  Under Windows, I find that my CPU fan runs constantly audible. The fan made ramp immediately after Windows starts, even with no applications running. Windows resource monitor shows the CPU usage in the range of 25 to 40%. However, the maximum percentage of CPU frequency is consistently above 100% (usually around 110-115%). This means that the system is too overclocking? If so, is it logical to deduce that this may cause the CPU fan to run so much? Finally, how can I get this back to 100% (or less)?

  The fan does not this way under MacOS.

  MB Pro (by 2012) running Windows 7 under Bootcamp (MacOS 10.11.6).

  reset the SMC

  Reset the management system (SCM) controller on your Mac - Apple Support

• Absolute cell to the cell range reference

  I would like to refer to a range of cells on one worksheet to another, all in the same worksheet.  When shoves and columns are changed on the source worksheet, I would like the second sheet to reflect this change, so I think that I need the absolute references.  I know I can do this for a single cell by making reference to the cell, by clicking on the arrow and horizontal and vertical locking.  Is it possible to do it for a range of cells?

  Thanks for your help.

  Hi GB,

  In the example, copy table cells reference the same cell in the Source, using the INDEX table.

  

  The formula entered in B2 is the following:

  B2: = INDEX (Source: $A:B,ROW(),COLUMN()))

  That the form is completed on the columns, the reference to a column remains the same, and the column reference b change to match the column containing this iteration of the formula.

  The reference by specifying only the columns where a range is average planned is in all cells in the column.

  Complete the form on the left to A2, then fill both down to line 3.

  Add rows or columns in the Source table and filling the new cells of data has no effect on the copy table.

  

  The copy table should be expanded using the column and handles command line at the top right and bottom left of the table, or the control handle of lines and columns in the lower right corner (visible on the first image of th, where a single table is selected)

  As the rows and columns are added, numbers automatically fills the formula into the new rows or columns.

  

  If the copy table is extended beyond the size of the Source table, 'extra' columns or lines contains an error of "bad reference."

  

  Add lines to the source table removes the error in previously 'extra' copy lines, because there the range, specified as the "entire column" automatically sees the lines added.

  

  

  The column added, however, must be removed from the copy, and then added to copy the formula without error in column C in column D.

  Kind regards

  Barry

• Firefox for windows does not display absolute divs positioned on flash video

  I have a site that has a brightcove video player. About a month or two before I could separate the video of divs so that they would appear on top of the video player, using absolute positioning.

  You can see the drive here:

  lifeminute. TV/VSD/8 + 9 + 10 + 11 + 12 + 34/widget300s

  In Firefox (mac), Chrome (windows), Internet explorer (windows) and Safari (mac) it always display correctly. In Firefox (windows), the video player ignores the index-Z I assign and always place the divs below, except IF I give the div floating a solid background color.

  When I assign the following styles to the div that contains the overlay, I can see the text correctly, but of course the video is blurred.

     background-color: #FFFFFF;
     height: 158px;
     position: absolute;
     top: 4px;
     width: 275px;
  

  If I remove the entire overlay background color element appears at the back of the battery behind the video again.

  Is this a bug of windows FF or am I just missing something obvious?

  Sometimes, you gotta add wmode = "transparent" attribute to the flash video code embed.