Lecroy WaveAce224 - Pass/Fail

Oscilloscope

Folder: Electronics
Lecroy WaveAce224 - Pass/Fail

Lecroy WaveAce224 - Pass/Fail

24 Feb 2010 138
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

Not so clean edge

18 Apr 2012 150
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

Serial data at 9600bps

18 Apr 2012 129
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

Clean edge

18 Apr 2012 130
Serial data at 9600bps

Serial data at 9600bps

18 Apr 2012 143
The little insert is quite annoying. It simply doesn't want to move out of the way.
MIBAM waveform

MIBAM waveform

19 Apr 2012 145
As expected / feared, memory depth is always too low :-( Every DSO should have at least 1M per channel.
MIBAM waveform

MIBAM waveform

19 Apr 2012 146
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.
Confused trigger

Confused trigger

19 Apr 2012 138
This one should have triggered on a positive pulse shorter than 73µs.
Confused trigger

Confused trigger

19 Apr 2012 137
This one should have triggered on a positive pulse longer than 177µs.
MIBAM

MIBAM

19 Apr 2012 145
Playing with the persistence setting. It is variable, but unfortunately the old traces don't fade out. They just vanish after a timeout.
MIBAM - trying to get it to trigger

MIBAM - trying to get it to trigger

19 Apr 2012 147
MIBAM - delayed interrupt

MIBAM - delayed interrupt

19 Apr 2012 146
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 - bad ISR runtime

19 Apr 2012 143
The ISR takes too long and messes up the timing of the least significant bits.
MIBAM - OK ISR run time

MIBAM - OK ISR run time

19 Apr 2012 145
Now the ISR is short enough as not to interfere too much with the least significant bits.
98 items in total