adulbrich
5,000+ posts
Olive oil un-virginer
Ok, so we tried to set my gains with this scope tonight:
Portable Arm Nano DSO201 Oscilloscope Mini Storage LCD Digital Pocket Sized Kit | eBay
It's my understanding that lots of you have this scope. Several people recommended it to me.
I downloaded a 40hz test tone that was supposed to be at 0db. First, I wanted to see what volume my headunit clipped at. From previous setups, I guessed was at 22/35. Kept turning it up more and more. Maxed out the HU at 35, with the sub level at +15. Wave was still perfectly clean. I was a little surprised that it didn't show any clipping, but moved on anyways.
Connected RCA's to amp (after turning everything off, of course). Then we tried to set the gains on the amp with the scope. Ended turning the gain dial all the way up, and the signal coming out of the amp was still perfectly clean. At this point, I knew something had to be wrong. No way I had a completely clean output signal with HU and amp gain both all the way up.
I re-connected a sub to test the settings. Turned the head-unit all the way down to zero, then started some music that I normally listen to. Then, I slowly rolled up the volume until the clipping light started to flicker on the remote gain knob. It was clean up to 17/35. At 18/35 it occasionally flickered. Anything higher and it flickered bad.
On a song with long bass notes, we tried to look at the waves and set gains based on that, but the window wasn't big enough. Couldn't zoom out or put sensitivity low enough to see the whole waveform.
I'm guessing the test tone I downloaded is at a recording level much lower than 0db.
Where can I download a true 0db sine wave for 40hz or 50hz? Also need one for 500hz and 5,000 hz.
Also, what's the biggest or most powerful amp you guys have used this scope for? Couldn't see the full waveform close to full output //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif
Any useful tips or advice is appreciated.
Portable Arm Nano DSO201 Oscilloscope Mini Storage LCD Digital Pocket Sized Kit | eBay
It's my understanding that lots of you have this scope. Several people recommended it to me.
I downloaded a 40hz test tone that was supposed to be at 0db. First, I wanted to see what volume my headunit clipped at. From previous setups, I guessed was at 22/35. Kept turning it up more and more. Maxed out the HU at 35, with the sub level at +15. Wave was still perfectly clean. I was a little surprised that it didn't show any clipping, but moved on anyways.
Connected RCA's to amp (after turning everything off, of course). Then we tried to set the gains on the amp with the scope. Ended turning the gain dial all the way up, and the signal coming out of the amp was still perfectly clean. At this point, I knew something had to be wrong. No way I had a completely clean output signal with HU and amp gain both all the way up.
I re-connected a sub to test the settings. Turned the head-unit all the way down to zero, then started some music that I normally listen to. Then, I slowly rolled up the volume until the clipping light started to flicker on the remote gain knob. It was clean up to 17/35. At 18/35 it occasionally flickered. Anything higher and it flickered bad.
On a song with long bass notes, we tried to look at the waves and set gains based on that, but the window wasn't big enough. Couldn't zoom out or put sensitivity low enough to see the whole waveform.
I'm guessing the test tone I downloaded is at a recording level much lower than 0db.
Where can I download a true 0db sine wave for 40hz or 50hz? Also need one for 500hz and 5,000 hz.
Also, what's the biggest or most powerful amp you guys have used this scope for? Couldn't see the full waveform close to full output //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif
Any useful tips or advice is appreciated.