- This topic has 3 replies, 2 voices, and was last updated 5 years ago by Anonymous.
- September 18, 2017 at 12:20 am #18992Michael BullGuest
I am investigating output current curves of transcranial direct current stimulators. Ideally I would like to sample at 2000Hz – but with the buffer it does not seem like this will be possible.
Having said that the effective sampling rate does not seem to be close to what it should be. With the settings at 8000Hz and 32smpl I would assume there should be 250 data points per second, rather there seem to be only about 11 per second.
It does not seem to sample at anything like the rate suggested by the settings – would you be able to help me with this.
- September 18, 2017 at 6:09 am #18996AnonymousInactive
- September 22, 2017 at 3:59 pm #19027AnonymousGuest
All makes a lot more sense.
It would appear, then, that the Mooshimeter is not capable of picking up the small spikes as they will be lost in the averaging.
Do you think there is a way to get around the averaging ? Modification to Mooshimeter ?
Would another multipmeter be better ?
Or, is the only alternative an oscilloscope – unfortunately to measure votage and curent at the same time will be expensive – current probe ?
- September 23, 2017 at 3:14 am #19030AnonymousInactive
From what I have read, firmware is basically “ready”. There is no space left for new stuff and as long that it mostly works, we wont be seeing much development.. Smaller sample buffers might be possible (by James, because fw is closed source), but i’m not sure that is it also something that could be affected from the app (which is open), like James told about logging intervals..
Oscilloscope would be nice (but expensive) and current shunt would not cost anything.. Piece of (probably existing) wire should be enough in most cases.. It seems to be bit bad thing for mooshimeter, that people see graphs about electrical measurements and think that those only come from scopes. Mooshimeter should be taken as 2 channel multimeter, that can log. It can do it bit faster compared to human with couple multimeters, pen and paper, but it would not make it an oscilloscope.. Buffer mode in graph view might raise the hope even more, but really it still limits your measurements to few hundred hertz with shooting in the dark as a trigger mechanism. It is much more though than most multimeters do in the same price range.