Haasoscope

Cheap, flexible, data acquisition for all!

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Feb 06, 2018

Project update 13 of 21

While Waiting for Prototypes

I’m still waiting for the 4 prototype boards to come back from MacroFab. I think they got slowed down by Christmas/NY’s. But they should arrive next week! In the meantime I’ve added a few software/firmware features…

One is "highres" mode. When you want to read out slower than the sampling rate, e.g. to see a 10kHz signal, you want to sample every ~1000ns, not every 8 ns (the max 125 MHz). That means you could just skip 124 out of every 125 samples. But better yet would be to average those 125 samples! It reduces random noise. This is what highres mode does, which is a standard optional feature on scopes, and now can be used on the Haasoscope. Here’s what a 10kHz wave looks like with and without highres mode:

Persist display of channel 2 - highres.

Persist display of channel 2 - no highres.

It’s significantly cleaner using highres mode. I’ve made it the default for now, but you can turn it off if you want to.

Another feature is "XY" mode. This is also a standard scope feature, that lets you plot chan 1 vs. chan 2, instead of channels vs. time. If you select a channel on the Haasoscope now, and press "Y", you’ll get a new window showing the XY plot of that channel and the following channel (e.g. if you click on channel 2 and do "Y" you’ll get an XY plot of channel 2 vs. channel 3). This lets you investigate many thing more easily, and play with the ever fascinating Lissajous figures!

XY display of channels 2 and 3.

Some more about these mesmerizing things here: https://www.youtube.com/watch?v=t6nGiBzGLD8

Till next time, Andy.


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