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Question about setting gain with O scope
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<blockquote data-quote="FML" data-source="post: 8334120" data-attributes="member: 630747"><p><span style="color: blue">So, I just recently acquired an o scope to assist me in tuning my amp to my woofer. Im getting confused on the proper way of doing it. Iv only come across one tutorial that specified where your LPF should be set on your amp when running your test tone (in my case, 50hz) ,while using the o scope. That person said to have it all the way turned up, with the gain obviously all the way down to start.</span></p><p></p><p><span style="color: blue"> </span></p><p></p><p><span style="color: blue">What I noticed was, the signal clipped much sooner with the low pass filter all the way up after only turning the gain about 1/6 turn. But when I restarted the test, i set the LPF at about halfway and was able to turn my gain up about double the amount before I saw clipping. I didn't realize just messing with the filter on a very low gain setting would produce a squared off sine wave.</span></p><p></p><p><span style="color: blue"> </span></p><p></p><p><span style="color: blue">Iv heard to turn the LPF all the way up, set gain, then reduce the filter to desired level. But doing that, I got a reading probably 20 volts lower than where it previously was.</span></p><p></p><p><span style="color: blue"> </span></p><p></p><p><span style="color: blue">Does either way work, as long as my signal isn't clipped? I may be confusing some folks so ill paraphrase: </span></p><p></p><p><span style="color: blue"> </span></p><p></p><p><span style="color: blue">I could turn my gain a bit more than halfway up, with the LPF about a quarter turn and recieve a clean, unclipped signal. But when redoing it with the LPF all the way up at start, (the supposed correct way) I could only get a very small 1/6 turn on my gain knob before noticing clipping. </span></p><p></p><p><span style="color: blue"> </span></p><p></p><p><span style="color: blue">So which way do I want it? Higher filter, less gain, or more gain, less filter? Either knob I turn while running the o scope drastically changes the wave form and im confused. Thanks folks.</span></p><p></p><p><span style="color: blue"> </span></p></blockquote><p></p>
[QUOTE="FML, post: 8334120, member: 630747"] [COLOR=blue]So, I just recently acquired an o scope to assist me in tuning my amp to my woofer. Im getting confused on the proper way of doing it. Iv only come across one tutorial that specified where your LPF should be set on your amp when running your test tone (in my case, 50hz) ,while using the o scope. That person said to have it all the way turned up, with the gain obviously all the way down to start.[/COLOR] [COLOR=blue] [/COLOR] [COLOR=blue]What I noticed was, the signal clipped much sooner with the low pass filter all the way up after only turning the gain about 1/6 turn. But when I restarted the test, i set the LPF at about halfway and was able to turn my gain up about double the amount before I saw clipping. I didn't realize just messing with the filter on a very low gain setting would produce a squared off sine wave.[/COLOR] [COLOR=blue] [/COLOR] [COLOR=blue]Iv heard to turn the LPF all the way up, set gain, then reduce the filter to desired level. But doing that, I got a reading probably 20 volts lower than where it previously was.[/COLOR] [COLOR=blue] [/COLOR] [COLOR=blue]Does either way work, as long as my signal isn't clipped? I may be confusing some folks so ill paraphrase: [/COLOR] [COLOR=blue] [/COLOR] [COLOR=blue]I could turn my gain a bit more than halfway up, with the LPF about a quarter turn and recieve a clean, unclipped signal. But when redoing it with the LPF all the way up at start, (the supposed correct way) I could only get a very small 1/6 turn on my gain knob before noticing clipping. [/COLOR] [COLOR=blue] [/COLOR] [COLOR=blue]So which way do I want it? Higher filter, less gain, or more gain, less filter? Either knob I turn while running the o scope drastically changes the wave form and im confused. Thanks folks.[/COLOR] [COLOR=blue] [/COLOR] [/QUOTE]
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