[ProAudio] VU meter permitted overdrive with a sine wave...

[Bob Katz]

Thank you, Jay. I may have an original VU paper filed somewhere. But the 
list was so quiet I thought I would wake it up. :-)


Best wishes,



Bob


On 1/28/21 10:15 PM, Jay at MRL Support wrote:
> Re: [ProAudio] VU meter permitted overdrive with a sine wave... Hello Bob,
>
> It appears that no-one has ever read any of the once-published 
> standards on the vu meter.
>
> "15 Overload input level - Performance requirement
> "The indicator shall withstand, without damage or any effect on 
> calibration,
> an overload of ten times the voltage giving reference indication for a 
> time
> interval of 5 s and an overload of three times that voltage for unlimited
> period of time. "
>
> That would be +20 dB and +10 dB, respectively
>
> This same text is in the original Chinn IRE ~1940 paper ( 
> https://www.aes.org/aeshc/pdf/chinn_a-new-svi.pdf ), the IRE Standard, 
> the IEEE Standard, the ANSI Standard, or the current Standard, IEC 268-17.
>
> On Thursday, January 28, 2021 at 9:26, you (Bob Katz via ProAudio) wrote:
>
>
> 	This list has been remarkably silent, but I am very grateful that 
> it's around when I have a question to ask AUDIO EXPERTS.
>
> Who here knows the acceptable rating of a standard mechanical VU meter 
> above 0 VU with a sine wave?  If I recall correctly, they are designed 
> to accept as high as +6 VU or even higher. For example, when doing 
> testing of a tape recorder for headroom. It's still ideal to shut off 
> the meter, but in some cases that's not possible.
>
>
> Thanks and happy New Year!
>
>
> Bob
> -- 
>
>
>
> /--
> Best regards,
> Jay McKnight
> at
> Magnetic Reference Laboratory, Inc /mailto:mrltapes at comcast.net
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-- 

If you want good sound on your album, come to Bob Katz 407-831-0233 
DIGITAL DOMAIN MASTERING STUDIO Author: *Mastering Audio* Digital Domain 
Website <https://www.digido.com/> No trees were killed in the sending of 
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