Why NOT-9233 with IEPE micro report 39dBA as a minimum noise level?

Hello

I used an ACO Pacific 1/2 "microphone and preamp (7052SYS) with cDAQ IEPE and 9233 IEPE module. The microphone of the COA is very similar to the 46AE G.R.A.S. (50 mV/Pa) but with sensitivity 20 mV/Pa. With this facility in a hemi-anechoic room, the NPA is reported as on 39dBA (using audio and vibration standard "meter" VI). Again, the third laboratory signals Analyzer reports the House about 25dBA. I partially checked installation OR with a 1 kHz, 114dB Sizer. Putting in place OR says about 114.3dBA. We are so on the money there.

Is there a background noise on the 9233 I treat? Any thoughts? Recently, my company has built its own hemi-anechoic and we love the tools NOR. We had hoped to use the newer 9234 with a chassis cDAQ since the 51.2 kech / s is sufficient for our range of 20 to 20 kHz. We already use it cDAQ widely here.

Thank you

-JD

The 9233 plug:

Integrating the density of noise:
Weighted power = (factor of a power of weighting for bandwidth) * (bandwidth) * (noise level) ^ 2
Weighted power = (0.53) * (20-20000 Hz) * (400 nV / sqrt (Hz) / 20 mV / Pa) ^ 2
Weighted power = 4.26u Pa ^ 2 rms
(Weighted) Leq = 2.06 m Pa rms DB 40.2 (a) ref 20u Pa

Calculation of noise at full scale:
FS = voltage range / sensitivity
FS = (5 / sqrt (2)) V rms / (20 mV / Pa) = 176.8 Pa rms = 138.9 dB ref 20u Pa
Noise 138.9 DB ref 20u Pa - 95 dB FS - 2.73 DB(a) = 41.2 DB(a) ref 20u Pa

So the fact that you are reading 39 DB(a) indicates your 9233 noise meets the specifications. There is always a problem that it takes efforts to better reflect the range of the signal on the input of the 9233 range. You can add some signals external conditioning apply pregain (20 dB) to the microphone output before the 9233. You also have some other options material DSA that include the input gain.

Tags: NI Products

Similar Questions

  • The latest update of firefox is not compatible with trend micro security and people with disabilities, it's when I clicked on install. How to bring back my trend micro?

    I downloaded a firefox security update. When I clicked on install (or apply), I was told it disabled my security from trend micro, and there is no version compatible with trend micro. He told me they keep control and let me know what is available. NOT GOOD. I paid a lot of money for my trend micro and want it to be functional. Help! I didn't click on finish. Does that mean the upgrade is not installed and that trend micro still works?

    I seem to have fixed that by going to the site of Trend Micro and upgrade to the latest version of Trend Micro Titanium 2012 V5.0. It uninstalled the previous version on my computer and then install the latest version. Trend Micro is working now and I can browse with Firefox. The upgrade was free.

  • Host CPU is not compatible with the requirements of the virtual machine in the level 0 CPUI register x 1 'ecx '.

    I have a cluster of three ESX servers.  They are IBM 3650 and they are the exact same material bought at the same time.  They even the same exact versions of the firmware (bios, bmc, nic firmware, HBAs, raid, HDD firmware, rsa, etc.).  I started their reclassification of ESX 3.5u3 to ESX4 with all the latest patches.  Then I updated one moved some top vm and upgraded vmware tools and virtual materials without problem.  So, I went and upgraded the following ESX Server and has started moving the machines on that one and upgraded vmware tools and virtual hardware.  I tested the functionality of the ESX servers and they seem to work fine.  I vmotioned machine version 4 hardware virtual machine between the two developed level ESX host very well so I me with the upgrade process.  Then I had to vmotion, one of the virtual machines updated (version 7 of material) between the two ESX hosts newly improved and they won't vmotion.  It gives me the error CPU host is not compatible with the requirements of the judgment of the VM to CPUID level register 0 x 1 'ecx '.  The full error message is in the attachment.

    Apparently, the virtual machine hardware upgrade exposed a few additional things virtual machine that prevents vmotion to work.  I don't know what and I'm quite surprised because these machines are identical identical hardware and firmware.

    All of the suggestions.

    This is a known unfortunately problem

    http://KB.VMware.com/kb/1011294

  • Why has Adobe decided to do cloud subscription and not continue with the Collections?

    I know that it is hard to predict the future and trends. And I know wanted offer convenience, but it's an inconvenience when you do not offer a time offer without continually having to pay for a product. Yes. Adobe is an exceptional product. But you could potentially lose a good customer because continually have to pay for a product year after year without ever owning. People prefer to invest a lump sum, then ending up paying more in the long term. I just wanted to know why not continue with CS 7, 8, 9. Or if you want clouds. Let a time buy and be able to have available for use without the CD.

    You can always buy cs6 (Creative Cloud now includes the features of Creative Suite Master Collection and Design Premium)and a handful of other adobe programs.

  • BlackBerry 8530 Curve smartphones does not sync with my Microsoft Outlook 2010.

    Curve 8530 does not sync with my Microsoft Outlook 2010.

    Although I used a Palm Treo years, I am new to BB and Metro PCS. The OS is v5.0.0.973. (The Palm Treo has not correctly synchronized since this summer. that's why I got the Blackberry.) Some old Palm Treo data are saved as ASCII files).

    I connect my new BB 8530 via the USB port on my computer. From the Blackberry Desktop Manager 5.0.1 version, I click the icon synchronize. I select the boxes to synchronize the data of the Organizer, to update the time and date of the device and synchronize automatically. When I click on synchronize, the message box asks me if I want to configure synchronization settings now. Ok.

    He asks me to choose an application to synchronize. By clicking on the calendar, select Microsoft Outlook and 2 way to sync. Complete the installation schedule welcome.

    However, when I cliquerai to finish, I get the error message "Microsoft Outlook Connector error: no available message store.» The setting does not save.

    the same result for other applications.

    I shut down my computer and restarted. I deleted the Intellisync folder, as suggested in another post. still no synchronization.

    Sync Suggestions welcome!

    Davsco

    Hi and welcome to the Forums!

    Office of RIM 5.0.1 software tells you that you are using is not compatible with Outlook 2010. You need to upgrade to level 6.0 from the RIM of the Desktop for Outlook 2010 compatibility software. However, if you use Outlook 2010 64-bit, there currently is no version of RIM software which is compatible... only the 32-bit Outlook 2010 is currently compatible.

    Good luck!

  • Why not all the partition tables

    Hello

    In our project we propse to all partition tables (even if they are small, in MBs) in order to use the feature partiion exchange.
    But our DBAs say that maintenance will be a problem if create us partitions for each table. We said, only tablespace is fine for all partitions that we thought to maintain storage different is a problem.
    But always DBA are not approved.
    I just want to know what are the disadvantages of partitioning. Why DBA are generally against the idea of creating partitions. If we use the same storage space for all of the partitions is there any side down for creating partitions for each table?
    Is there is disadvantage?



    Thank you
    Pramod Garre

    Pramod Garre wrote:
    We plan to use range partitioning (in the quarters).
    There is a duty to remove a quarter of the table data, then refresh with new data as and when the user update some recored of frontend.this should arrive in real-time.

    Looks like you are having the app trigger partition management... which doesn't seem a good idea.
    It also looks like you really don't have justification for partitioning on a few tables. Far from being the "all" tables you inquired. And even that looks like your concept of the use of these scores may be wrong.

    Why not work with your databases instead of look at foreigners for the justification to fight them. Sounds to me like they are doing exactly what they were hired to do.

    We thought instead of delete and insert, if we use excahnge partitions, it will be real quick as Exchange just updated partition in the dictionary.
    On these lines, do you think that it be the disadvantages of the use of partitioning?

    Note: Delete and Insert works OK (2 minutes) compared to the swap partition (20 ms).

    And Yes, each table has PK.

    Thank you
    Pramod Garre

  • Personas do not work with firefox 3.6 and yet he directs me to the personas rather than themes page why?

    I've recently updated to Firefox 3.6.3. and I was wondering why I can't use personas, I discovered that they are not compatible with 3.6. But my problem is that whenever I click on 'Get themes' in the section modules, I've redirected the page to personas and tells me I need to upgrade to get the most out of the site (essentially, downgrade to version 3.5) is there any other way around this?

    == I upgraded to 3.6

    Personas (light themes) are integrated in Firefox 3.6.

    Where did you see that they are not compatible with 3.6?

    This is the reason why they probably do not work for you is your Firefox User Agent string is marred by another program you have installed, or maybe a failed attempt to usurp IE 6.
    http://en.Wikipedia.org/wiki/USER_AGENT

    • Type of topic: config in the URL bar and press ENTER.
    • If you see a warning, you can confirm that you want to move forward.
    • Filter = general.useragent.
    • Preferences that are bold, one line at a time, right-click and select Reset.
    • Then restart Firefox

    Check out the Web sites or modules incorrectly report incompatible browser and find what version of Firefox you are using

  • Why Bitmoji will not work with iOS 10?

    Why Bitmoji does not work with ios10?

    What I found was that by changing the bitmoji keyboard and turn it back on, the selections of bitmoji are back. Good luck!

  • Why personas do not work with all themes?

    Why personas do not work with all themes?

    Not all personas work well with a custom theme, the developers of Firefox have decided to return to the theme by default if you install a character.

    A theme can allow personsas with this line in the install.rdf file, as does the default theme.

    • < em: skinnable > true < / em: skinnable >

    So if a theme doesn't work with a character then skinnable is not enabled.

  • I use a Mac 10.5.8 and your software says it must be compatible with 10.5, but he says it's not compatible with my operating system. Why?

    I use a Mac 10.5.8 and your software says it must be compatible with 10.5, but he says it's not compatible with my operating system. Why?

    10.5.8 it is compatible with firefox only with Intel see 10.0:

    http://www.Mozilla.org/en-us/Firefox/10.0/system-requirements/

    for your ppc mac, the most recent is the version that you have 3.6.26 see:

    http://www.Mozilla.org/en-us/Firefox/3.6/system-requirements/

    Thank you

    Please check 'Resolved' the answer really solve the problem, to help others with a similar problem.

  • I have Trend Micro antivirus for Windows 7, but I'm told it's not compatible with Mozilla 9.1, how to get an older version or to adapt?

    I use a computer laptop, just reinstalled everything and now have Firefox 9.1 and tells me that is not compatible with my antivirus, Trend Micro Titanium. I am running Windows 7.

    This situation should not come up again with future versions of Firefox. From Firefox 10.0 (to be released Jan 31 Mar) modules will be assumed to be compatible with the new version of Firefox and they will be not disabled, as in the past. Well sure, if an add-on does not work correctly or totally screws to the top of Firefox, it is up to the user to sort only the cottages, with a little help from those of us who provide Firefox support.

  • Why this scriipt does not work with Firefox? &lt; embed src = "News2008Fall.pdf" width = '615' height = '3200' &gt; &lt; / embed &gt; "

    Please tell me why this script does not work with Firefox. It works with Safari. Here is the page that includes the script: www.lionsgatehoa.org/newslettertest.html. Thank you. Tom Engleman

    Here's the script in my html document:

    < embed src = "News2008Fall.pdf" width = '615' height = '3200' > < / embed > "

    Edit: removed # phone

    Works for me on Linux.

    Your system details list does not display the Adobe Reader plugin, so you'll have to (re) install this program.

    See:

  • Why the iPad is not compatible with Amazon Pro premium?

    DDoes anyone know why the Pro is not compatible with Amazon prime? I can get the first one on my iPad two old as well as my partners air2.

    Strange, isn't it?

  • "This issue is not compatible with your device." Why?

    Hello Firefox! I don't understand, why can't I just install Mozilla browser on my Motorola Milestone XT720? I read "this point is not compatible with your device." Why? Please answer me! Thank you!

    http://bit.LY/fennecftp

    Although it would be good to do a datasheet for your phone. I was under the impression that all milestones were 256 MB.

  • Why mackbook Airdrop and bluetooth can not work with iphone 5s?

    Hello.

    I have a macbook pro late 2011 (os x El Captain) and iPhone 5s version 9.1.2

    Question 2:

    1. I turn on and correctly configured AirDrop (select all) but Airdrop macbook can't find iPhone 5s.

    Why? because my macbook before 2012?

    2 - Iphone can not connected with bluetooth macbook.

    The first macbook paired iphone / go to the bluetooth menu in mac / iphone / click on to connect to the network

    then I see this notification:

    the network is unavailable. Make sure that your access is activated.

    Please help me

    Thank you

    1. it's okay.

    To send items to an iPhone, iPad or iPod touch, you have a 2012 model or more recent Mac with OS X Yosemite or later version, except the Mac Pro (mid-2012).

    Use AirDrop to send the contents of your Mac - Apple Support

    2 iPhone Bluetooth is not designed for the transfer of files. You can send the files some other way, such as e-mail, Cloud Computing service or photo stream (for photos).

Maybe you are looking for