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<p>Thanks, Crispin. So it looks like +6 VU at 1 kHz Sine for a
minute or two ought to be acceptable. Not comfortable, but
acceptable.</p>
<p><br>
</p>
<p><br>
</p>
<p>Best wishes,</p>
<p><br>
</p>
<p><br>
</p>
<p>Bob</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 1/28/21 1:47 PM, Crispin HT wrote:<br>
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<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The
Sifams we use are a taut band design – a rectangular wire
takes the current in and out of the coil, suspended in a
magnet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The
torsion on the wire counters the electric force to make the
meter stop at the desired level.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US">When
you overload it, the meter needle stops the coil from
rotating anymore, and as you pass more current through it,
the coil will start to move away from the centre of the
magnet, stretching the taut wire, and potentially grounding
the coil on the magnet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US">My
guess is you can put a lot more than +6 into it without
damage for a period of time, a bit like heatsinking on a
semi, high overload for a short time, low overload for a
long time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I’m
guessing + 12VU should be OK for a longish period ( 4 x
voltage, 16 x power), but YMMV<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe
UI",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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style="font-size:10.0pt;font-family:"Segoe
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style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:10.0pt;font-family:"Segoe
UI",sans-serif;color:#1F497D">Crispin Herrod-Taylor<br>
</span></b><b><span
style="font-size:10.0pt;font-family:"Segoe
UI",sans-serif;color:black">Managing Director,
Crookwood</span></b><b><span
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</span></b><span
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<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> ProAudio
<a class="moz-txt-link-rfc2396E" href="mailto:proaudio-bounces@bach.pgm.com"><proaudio-bounces@bach.pgm.com></a> <b>On Behalf Of </b>Bob
Katz via ProAudio<br>
<b>Sent:</b> 28 January 2021 17:27<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:proaudio@bach.pgm.com">proaudio@bach.pgm.com</a><br>
<b>Subject:</b> [ProAudio] VU meter permitted overdrive
with a sine wave...<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>This list has been remarkably silent, but I am very grateful
that it's around when I have a question to ask AUDIO EXPERTS.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>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.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><o:p> </o:p></p>
<p>Thanks and happy New Year!<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><o:p> </o:p></p>
<p>Bob<o:p></o:p></p>
<div>
<p class="MsoNormal">-- <o:p></o:p></p>
<pre><span style="font-family:"3D"Courier"",serif"><o:p> </o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif"><o:p> </o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif">If you want good sound on your album, come to<o:p></o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif">Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO<o:p></o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif">Author: <b>Mastering Audio</b><o:p></o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif"><a href="https://www.digido.com/" moz-do-not-send="true">Digital Domain Website</a><o:p></o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif"><o:p> </o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif">No trees were killed in the sending of this message. However a large number<o:p></o:p></span></pre>
<pre><span style="font-family:"3D"Courier"",serif">of electrons were terribly inconvenienced.</span><o:p></o:p></pre>
<pre> <o:p></o:p></pre>
</div>
</div>
</blockquote>
<div class="moz-signature">-- <br>
<pre><font class="3D""" face="3D"Courier"">
If you want good sound on your album, come to
Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
Author: <b>Mastering Audio</b>
<a href="https://www.digido.com/">Digital Domain Website</a>
No trees were killed in the sending of this message. However a large number
of electrons were terribly inconvenienced.</font>
</pre>
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