Oscilloscope
Folder: Electronics
Lecroy WaveAce224 - Pass/Fail
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Finally!
I've received a brand new Lecroy WaveAce224 digital storage oscilloscope (reduced price promotion).
When I'm lucky I might find some time to play with it on the weekends.
Not so clean edge
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The question: is the ringing real? In this case it was caused by sin(x)/x interpolation.
I was instantly suspicious as this effect only showed up at one zoom setting.
Serial data at 9600bps
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With 104µs the average bit time is pretty much on spec. A nice thing when running with a ceramic resonator. I had to tune the bit-delays to get there. The ATtiny85 unfortunately doesn't have a hardware UART.
Clean edge
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Serial data at 9600bps
MIBAM waveform
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As expected / feared, memory depth is always too low :-( Every DSO should have at least 1M per channel.
MIBAM waveform
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This should be a representation of the number 1110 = 14. The small spikes are caused by interrupt code running. The low periods should have lengths of 2N, 4N, 8N. I'll have to try this again with an external trigger. There is too much jitter to get a stable image.
MIBAM
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Confused trigger
Confused trigger
MIBAM
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Playing with the persistence setting. It is variable, but unfortunately the old traces don't fade out. They just vanish after a timeout.
MIBAM
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MIBAM - trying to get it to trigger
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MIBAM
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MIBAM - delayed interrupt
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Once in a while the interrupt gets delayed. The green pulse-train shows when and how long the ISR runs. This causes fluctuations in brightness.
MIBAM - bad ISR runtime
MIBAM - OK ISR run time
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Now the ISR is short enough as not to interfere too much with the least significant bits.
MIBAM
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