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Sorrodje's mic calibration gadget loaner (US & EU)

Discussion in 'Closed Loaners' started by sphinxvc, Nov 11, 2016.

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  1. sphinxvc

    sphinxvc Gear Master (retired)

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    Last edited by a moderator: Nov 14, 2016
    sphinxvc, Nov 11, 2016
    #1
  2. Serious

    Serious Inquisitive Frequency Response Plot

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    Oh nice, definitely interested. I've not really seen him comment on it. @sorrodje was your UMIK calibration reasonably accurate out of the box?

    Everyone with a measurement rig, get in on this. I also secretly believe that @Marvey's calibration isn't 100% accurate. Would be nice if he could check.
     
    Serious, Nov 11, 2016
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  3. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    sorrodje, Nov 11, 2016
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  4. spwath

    spwath Hijinks master cum laudle

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    I have a measurement rig. Dont know how good my coupler is at the moment, but seems good.

    I would be interested if
    A: I would be aloud despite the fact im not a friend
    B: Somone would tell me how to use this to calibrate my mic
     
    spwath, Nov 12, 2016
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  5. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Very easy to use. you put the mic in the hole of the calibrator, use your software as a soundmeter, put the Calibrator ON at 94db and check if your mic measures 94db . if not you need to change you calibration. :)
     
    sorrodje, Nov 13, 2016
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  6. spwath

    spwath Hijinks master cum laudle

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    Actually would that even work with the little small mic I have, I made the one in the guide in the measurement section
     
    spwath, Nov 13, 2016
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  7. stratocaster

    stratocaster Friend

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    Would certainly like to try the calibrator once it is making its way around in the EU.
     
    stratocaster, Nov 13, 2016
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  8. atomicbob

    atomicbob dScope Yoda

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    I acquired one of those for rough field work. Don't like to take my calibrated Bruel & Kjaer 4231 out of the lab. For what it's worth, Scantek calibrates my 4231 and mics:
    http://scantekinc.com/
    When compared, the ND9 was off by approximately 0.7 dB at 94 dB SPL @ 1000 Hz. It also doesn't compensate well over temperature range. Hey what do you want for $115. But it does hold calibration over time, at the temperature which it was calibrated, pretty well.

    If it makes its way to me, I will be happy to run a calibration check against my 4231 using ACO 7046 mic capsule on a Josephson C617 body. I can also bring calibration into spec if desired.
     
    atomicbob, Nov 13, 2016
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  9. atomicbob

    atomicbob dScope Yoda

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    Made me think about running a calibration check today on the ND9. it had been a year since I last checked my ND9.
    Here are the results.

    Conditions:
    17.8 deg C
    56.9 % RH
    1010 hPa

    Summary:
    ND9 as found measured 93.4 dB SPL with battery at 8.757 Vdc
    ND9 as left calibrated to 94.0 dB SPL with battery at 8.757 Vdc
    replaced battery
    ND9 as found measured 93.9 dB SPL with battery at 9.552 Vdc
    ND9 as left calibrated to 94.0 dB SPL with battery at 9.552 Vdc

    pictures:
    IMG_1549a.jpg
    7046+C617 reference measurement mic and B&K 4231 mic calibrator for system calibration 94 dB SPL = -16 dBFS - Smaart will use this as reference for 94 dB.


    IMG_1551a.jpg
    ND9 cross calibration


    IMG_1554a.jpg
    Atmospheric conditions

    20161113-1035 B+K 4231 94dBSPL=-16dBFS 7046-28439.png
    Initial system calibration with 7046+C617 B&K 4231 94 dB SPL = -16 dBFS


    20161113-1045 ND9 as found cal 1 year ago Batt V 8_757 94dBSPL=-16dBFS 7046-28439.png
    ND9 as found measured 93.4 dB SPL with battery at 8.757 Vdc


    20161113-1050 ND9 as left calibrated Batt V 8_757 94dBSPL=-16dBFS 7046-28439.png
    ND9 as left calibrated to 94.0 dB SPL with battery at 8.757 Vdc

    Battery replaced at this point.

    20161113-1055 ND9 as found Batt V 9_552 94dBSPL=-16dBFS 7046-28439.png
    ND9 as found measured 93.9 dB SPL with battery at 9.552 Vdc


    20161113-1100 ND9 as left cal Batt V 9_552 94dBSPL=-16dBFS 7046-28439.png
    ND9 as left calibrated to 94.0 dB SPL with battery at 9.552 Vdc
     
    atomicbob, Nov 13, 2016
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  10. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Glad to see my money is well spent. :bird:
     
    sorrodje, Nov 14, 2016
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  11. ultrabike

    ultrabike Measurbator - Admin

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    Added a few folks to the list.
     
    ultrabike, Nov 14, 2016
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  12. sphinxvc

    sphinxvc Gear Master (retired)

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    Thanks, G. Came by to do just that.
     
    sphinxvc, Nov 14, 2016
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  13. sphinxvc

    sphinxvc Gear Master (retired)

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    @ultrabike, let us know when you receive. I'm guessing we can get this back home within 2-2.5 months.
     
    sphinxvc, Nov 19, 2016
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  14. ultrabike

    ultrabike Measurbator - Admin

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    ultrabike, Nov 21, 2016
    #14
  15. atomicbob

    atomicbob dScope Yoda

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    @sorrodje ND9 calibration

    Conditions:
    18.9 deg C
    54.0 % RH
    993 hPa

    Summary:
    ND9 as found measured 93.6 dB SPL with battery at 9.760 Vdc
    ND9 as left calibrated to 94.0 dB SPL with battery at 9.760 Vdc

    calibration setup for sorrodje's ND9
    IMG_1589a.jpg


    ND9 as found measured 93.6 dB SPL with battery at 9.760 Vdc
    20161127-1640 ND9 N785787 as found Batt V 9_760 94dBSPL=-16dBFS 7046-28439.png


    ND9 as left calibrated to 94.0 dB SPL with battery at 9.760 Vdc
    20161127-1650 ND9 N785787 as left Batt V 9_760 94dBSPL=-16dBFS 7046-28439.png
     
    atomicbob, Dec 4, 2016
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  16. atomicbob

    atomicbob dScope Yoda

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    atomicbob, Dec 4, 2016
    #16
  17. MrButchi

    MrButchi Gear Master Europe

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    As suggested by @sphinxvc, I will try and be the proxy from there on.
    Don't hesitate to PM me for any question.
     
    MrButchi, Dec 9, 2016
    #17
  18. sphinxvc

    sphinxvc Gear Master (retired)

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    sphinxvc, Dec 10, 2016
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  19. MrButchi

    MrButchi Gear Master Europe

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    Last edited: Jan 4, 2017
    MrButchi, Dec 13, 2016
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  20. landroni

    landroni Friend

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    I'm not a friend yet, but I was wondering if I could participate in this loaner (on its European leg). On @atomicbob's recommendation I got myself a Leaton DL1351, and I'd love to be able to calibrate it.

    If it helps, here's my trader's feedback on HF.
     
    landroni, Jan 2, 2017
    #20
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