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Audio and Video Talk
The Vintage Audio Section
AVO Mk 4 calibratrion
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<blockquote data-quote="darrylo" data-source="post: 276976" data-attributes="member: 666"><p>I quickly grabed some resistors anda nice 10k multi turn pot (expensive pot :faint<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I fed exactly 32uA through the meter. this should get me a full scale deflection.</p><p></p><p>I got 92%. Its read 8% low :vsad:</p><p>On the Set ac position it should read 27uA but mine is 0n 31.5uA</p><p></p><p>I had a look at the shunt to see how much I can gain there. I managed to get the ac at 30.5uA and FSD at 34uA</p><p></p><p>set AC 30.5uA expected at 27uA</p><p>FSD 34uA expected at 32uA</p><p>1ma/v 24uA expected at 22uA</p><p></p><p>at 32uA I get 95% deflection so it under reads by 5% now.</p><p></p><p>No do I go with increasing the flux and keeping the circuit original or make this mod? http://www.vintage-radio.net/forum/showthread.php?t=50786</p></blockquote><p></p>
[QUOTE="darrylo, post: 276976, member: 666"] I quickly grabed some resistors anda nice 10k multi turn pot (expensive pot :faint:) I fed exactly 32uA through the meter. this should get me a full scale deflection. I got 92%. Its read 8% low :vsad: On the Set ac position it should read 27uA but mine is 0n 31.5uA I had a look at the shunt to see how much I can gain there. I managed to get the ac at 30.5uA and FSD at 34uA set AC 30.5uA expected at 27uA FSD 34uA expected at 32uA 1ma/v 24uA expected at 22uA at 32uA I get 95% deflection so it under reads by 5% now. No do I go with increasing the flux and keeping the circuit original or make this mod? http://www.vintage-radio.net/forum/showthread.php?t=50786 [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
AVO Mk 4 calibratrion
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