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Contact Us
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Morset Sound Development
+47 73915000
Persauneveien 25
7045 Trondheim, Norway
contact@winmls.com
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WinMLS User Tips and Hints
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Post your helpful tips that users find to make the setup, operation, or diagnostics of using WinMLS easier.
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Subject Absolute Calibration (SPL)
Date
Wed Nov 20 2002 00:12
Author Lars Morset
(morset@winmls.com)
File: Why does my calibration not seem to be correct.doc
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This is issues found by our new Swiss distributor which we really look forward to working together with:
> (A) Inconsistency of calibration with measurement:
> We calibrate the system (ch 1) using an external calibrator that generates
> 93.8dB @ 1kHz. This seems to work fine. We then perform a measurement ("no
> excitation (scope)") with the exact same calibrator in place and
> we look at
> the resulting measurement file (frequency response) which at 1kHz should
> show the level of 93.8dB. The plot consistently shows a level that is a
> couple of dBs lower than 93.8dB (around 88dB to 91dB). A workaround is to
> shift the plot by a few dB in the F5 menue, but we don't like this very
> much... :-) Any ideas why this could be the case?
SOLUTION: SEE THE ATTACHED DOCUMENT (find the attachement as a link above).
> eventually be nice to have some kind of dB SPL (A, C, fast, slow, even
> better: Leq) implemented in the system, where the ultraprecise level cal
> would be an absolute requirement.
This can be done. Except fast and slow, which we plan to implement.
Select the plot type Levels, click F5 to open the plot type settings and select dBA. You can check your calibration with this plot type as well.
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