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28th December 2006, 08:14 PM
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#1 |
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diyAudio Member
Join Date: Aug 2002
Location: Germany
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What do I see on my scope?
While checking an amp, feeding it with a pure sine wave, I can see that sine wave in ok shape but painted in a thick line. What should that tell me?
Without a signal, the amp shows only background noise, Rüdiger
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"I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog |
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28th December 2006, 09:21 PM
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#3 |
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diyAudio Member
Join Date: Aug 2002
Location: Germany
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Argh, always my darkest dreams come true
  Rüdiger
__________________
"I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog |
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28th December 2006, 10:39 PM
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#4 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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It may not be as bad as you fear. That kind of problem with low level oscillation may well be solvable by lead dress or better PSU decoupling.
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Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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28th December 2006, 10:40 PM
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#5 |
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diyAudio Member
Join Date: Jan 2006
Location: Fairmount, GA
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Harmonics?
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Poor stereo mix? Switch to mono! Perfect. |
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28th December 2006, 10:47 PM
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#6 | |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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Quote:
__________________
Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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28th December 2006, 11:46 PM
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#7 |
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diyAudio Moderator
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Depending on the test frequency, it can also be hum/ripple. Try synching to the line and play with the trigger level to see if there's some low frequency stuff in there.
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“Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache |
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29th December 2006, 04:16 AM
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#8 |
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diyAudio Member
Join Date: Jan 2005
Location: Phoenix, Az.
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It may also be a crappy scope. A lot of old scopes get fuzzy as the capacitors in their power supplies go bad. A good scope will display a thin, sharply focused line. Does the scope have a 1 kHz square wave calibration signal you can look at?
I_F |
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29th December 2006, 04:43 AM
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#9 |
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diyAudio Moderator
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If it's a Class-D amp, it the switching RF!
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Take the Speaker Voltage Test! |
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29th December 2006, 05:41 AM
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#10 | ||
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diyAudio Member
Join Date: Apr 2004
Location: 12km off the alaska highway in northern BC
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Quote:
Quote:
sorry, hard to refrain with question like these.... |
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