[ProAudio] VU meter permitted overdrive with a sine wave...
bobkatz at digido.com
Fri Jan 29 07:35:01 PST 2021
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. :-)
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
> an overload of ten times the voltage giving reference indication for a
> 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!
> Best regards,
> Jay McKnight
> Magnetic Reference Laboratory, Inc /mailto:mrltapes at comcast.net
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