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| USB current/voltage monitor with mA resolution? |
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| ebastler:
Thank you all for the great suggestions! I had not come across the class of "better" USB power monitors at all, with their ability to analyze USB-C power delivery modes. Now I am tempted by the FNB58 -- overkill for what I need at the moment, but the large and clean display and the rocker switch for controlling it are neat. Thanks again! |
| dophuc:
--- Quote from: ebastler on January 03, 2023, 07:20:45 am ---Thank you all for the great suggestions! I had not come across the class of "better" USB power monitors at all, with their ability to analyze USB-C power delivery modes. Now I am tempted by the FNB58 -- overkill for what I need at the moment, but the large and clean display and the rocker switch for controlling it are neat. Thanks again! --- End quote --- About a year ago I gave a brief introduction to two types of USB meters, FNB48 and Shizuku. FNB58 is an upgrade of FNB48, but the function and usage are quite similar. Newer USB meters are now available, supporting the detection (and triggering) of the latest PD3.1 charging standard. You can refer to some types like WITRN C3, chargerlab power-z km003c... advertised as using 16 or 20 Bits ADC... https://www.eevblog.com/forum/testgear/compare-some-types-of-usb-meter-such-as-fnb48-azhzy-ct3-ud18/msg4077952/#msg4077952 |
| AVGresponding:
--- Quote from: Hawaka on January 02, 2023, 08:33:16 pm ---I have an UM25C usb tester. Bought because of the extra digit and it claims 100nA resolution. Never checked it against a proper multimeter, but small variation in my circuit are display as small variation in current, so I guess it's not all that wrong. Never used the app tho. I just check the manufacturer (joy-it) and their USB-C meter claims 10nA resolution, would be interesting to see if that claim hold. --- End quote --- Nice! I searched that and found that forum member HKJ has a review and performance test of it on his website. Looks ridiculously good for the money (assuming you get a genuine one...) https://lygte-info.dk/review/USBmeter%20RD%20Tech%20USB%20Meter%20UM25C%20UK.html |
| egonotto:
Hello, Current measurement resolution: 0.0001A is not 100 nA! Best regards egonotto |
| MrAl:
Ruideng works pretty well. It also shows accumulated mAHr's and mWattHrs. Dont remember the cost, under $10 USD Amazon. Been using this for some years now. You can get a 1 foot USB extension cord with it or longer if you like. It can show voltages higher than 5v so charging modes that put out 12v will show up as 12v also. The one thing i dont like about it is the button on the back is far too small, and you have to hold it in for about 6 seconds to get the previous milliampere hour reading to zero out. The reading is persistent so you have to clear it before taking a new reading, but that's only for the accumulated readings if you just need current and voltage you dont have to clear it. But that button bites. It does have an interesting mode where you can flip the display orientation upside down. That's so that if you have to have it upside down to begin with, you can flip the display and then it reads normally. I would certainly buy another one, unless i looked for one with more functions, although i dont think i would need much more. It reads current, voltage, milliampere hours, milliwatt hours, resistance, and temperature. I am pretty sure it has 1ma resolution. The rule though is that if you need 10ma resolution then go for at least half that, 5ma resolution, or 2ma even better and of course 1ma even better yet. |
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