Learning as I go... Just finished recapping my Harman Kardon 330A receiver. Bought my first oscilloscope and am trying to execute the "Predriver/driver adjustment" indicated in the 330A manual.
1) On the fifth step, both channels already seem to show fairly balanced clipping. But each has a sort of double clip on one side. The right channel shows it on the top and the left on the bottom. I.e. two different clipping levels are visible at the same time on one half of the waveform. Not sure why, or which I should reference were I to adjust to perfectly balance the clipping.
2) On the sixth step, well I'm confused by the instruction. What's the crossover notch and is this something I'd see on the scope? I need help parsing the paragraph. It looks to me if I read it right that everything up to "(0.9 V RMS) output)," is one way to do it and everything after is another method, yes? Should I use the scope or a vu meter to measure the 0.9V RMS, and would that be measured across the speaker output with the dummy load in place?
Any pointers much appreciated - thanks!
-Mark M.
1) On the fifth step, both channels already seem to show fairly balanced clipping. But each has a sort of double clip on one side. The right channel shows it on the top and the left on the bottom. I.e. two different clipping levels are visible at the same time on one half of the waveform. Not sure why, or which I should reference were I to adjust to perfectly balance the clipping.
2) On the sixth step, well I'm confused by the instruction. What's the crossover notch and is this something I'd see on the scope? I need help parsing the paragraph. It looks to me if I read it right that everything up to "(0.9 V RMS) output)," is one way to do it and everything after is another method, yes? Should I use the scope or a vu meter to measure the 0.9V RMS, and would that be measured across the speaker output with the dummy load in place?
Any pointers much appreciated - thanks!
-Mark M.
