Home › Forums › Mooshimeter Support › High-frequency logging
- This topic has 6 replies, 2 voices, and was last updated 7 years, 11 months ago by admin.
- Jonathan BishopGuest
Thanks for adding logging support!
Now that you’ve had a chance to dig into this, what do you think the odds are of logging higher-frequency samples, possibly up to the 8192 Hz limit of the meter itself? Obviously AC might be too much since you mentioned needing to do RMS calculations, but just DC at that frequency (or even something near it) would still be awesome.
(Signed, “too cheap to buy a proper oscilloscope”.)
Just a quick bump on this one… any idea?
Another bump… any word on this?
It’s starting to feel like a bit of a black hole over here. Can we please get some word on this?
I failed you. Sorry, I remember reading your question, then thinking “what would it take to make this possible?”, following a mental rabbit hole and forgetting to follow up.
Bear with me here, there’s some nuance…
It’s possible to sample and log every sample at 8kHz, BUT it would get a little choppy. The meter can buffer 256 samples at a time, so it could record 256/8kHz = 32ms of data before having to write it to disk. Writing a 512 byte sector to disk takes 0.2-2ms, the buffer is 1536 bytes or 3 sectors, so we’re looking at 0.6-6ms to write it to disk. So in my judgement it’s possible but a little choppy – you would have a short gap every 32ms. Also I don’t know what the battery life would be like in this mode, if the meter is on full-bore all the time and writing to disk I think it will only last about a week on fresh AA’s.
This is one of the reasons I avoid calling the Mooshimeter an oscilloscope. It can do some of the things an oscilloscope can do, but it wasn’t designed to be an oscope :)
As far as this feature actually making it in to the firmware and app – because of the way the new firmware is written it’s quite easy to implement, so I can work that in, but updates to the app will take longer (there’s a major overhaul underway involving outside contractors).
Hope this sheds some light on the issue, thanks
Man, no worries! I figured you’d get a chance eventually. :D
Even if it’s not flawless, that’d still be a neat mode to have. The meter as it stands now is still an amazing device, and you deserve mad props for bringing it into the world successfully. Once I find my wallet I’m on board for preordering part of the next batch.
Thanks! Really appreciate the kind words :)