Look guys, it’s a real thing. “SparkFun offers the Mooshimeter, a multi-channel multimeter that harnesses a smartphone or tablet’s hardware as a wireless, high-resolution graphical display using Bluetooth® 4.0. The Mooshimeter is able to safely measure 600 V at 10 A with 24-bit resolution from up to 50 meters away making multi-channel measurements possible in situations that are too fast, too slow, too sensitive, or too dangerous to use a traditional multimeter.”
It doesn’t make any sense in your example, but there could be situations where it would. Personally, in my advanced age a large ‘analog’ display would be quite helpful.
It doesn’t make any sense in your example, but there could be situations where it would. Personally, in my advanced age a large ‘analog’ display would be quite helpful.
I looked it up, Digikey is indicating mooshi obsolete. I also looked at the datasheet still available, and they specified no accuracy spec. so not sure how accurate the thing was. I have a harbor freight DVM, I trust it to about 1% on voltage and 5% on everything else and it is still useful sometimes with that level of accuracy. But if I fry it, oh well. I think it was 7.99 I have a much more expensive B&K I use for more accurate work. I'd expect the mooshi is more like harbor freight accurate.
The purpose of the Mooshi is not accurate measurements but totally isolated/floated measurements.
I use it to measure Vgk in a cascoded 4kV HV amp, for instance. The whole thing sits at 2kV.
Jan
I use it to measure Vgk in a cascoded 4kV HV amp, for instance. The whole thing sits at 2kV.
Jan
Sounds like a good application for it, digikey had a photo and it is battery powered so completely floats. Someone posted 24 bit resolution. No way it is 24 bit accuracy.
https://www.digikey.be/en/product-highlight/s/sparkfun/mooshimeter-the-smartphone-multimeter
Go to about 50 seconds for the Mooshimeter:
No not 24 bit resolution, it has a 24 bit ADC. I don’t think that relates to accuracy or precision. The marketing guys put that out in the advert.
Edit: they are claiming 24 bit resolution, I don’t thin it means what they thin it means.
link: https://moosh.im/mooshimeter/
“Why 24-bit Resolution?
In the world of DMM’s, precision is usually given as a number of digits. The cheapest meters are usually 3.5 digits and carry a 12-bit ADC at their core. An entry level professional meter will usually be 4.5 digits and have a 16-bit ADC internally. The Mooshimeter reinvested the money saved by dropping the display and interface hardware back into the measurement components and is built around a 24-bit ADC. This gives you up to 7 digits to work with, though for most measurements expect 5-6 noise free digits. Combined with the graphing capability of your smartphone, this allows you to pick up the smallest and most subtle signals.”
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I’ll settle for some beer and Cheeze-its. 😋I think someone needs a valium and a hug.
Here is a pen like meter (Pokitmeter) that claims to have O-scope capabilities.
https://shop.pokitmeter.com/collections/home-page-showcase-products/products/pokit-pro
Yep, there's also the linearity issue too and sample rate/count isn't mentioned, nor is the noise floor (other than a statement about digits of other devices).
I have a Brymen 869s which is 5 digits on 500,000 count mode, and built a 24bit ADC with a 5572.
Yes having a nice UI is great.. but in the end I like my Brymen because it takes two seconds to setup I can read it from meters away and it seems bullet proof - regardless if I'm measuring LDO regulator drift at sub 1mA or meaning tube amp B+. It also measures a signal up to 100KHz which means I can trace a signal with it without a scope. (it's also been shown to survive it's rated 1KV, over voltages of 5KV and 15KV with a diode replacement)
It may be a great device and provide insulating distance but it needs some "testing" before it establishes a reputation to replace the Brymen 😀
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