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New EEVblog BM786 Multimeter

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EEVblog:

--- Quote from: NoisyBoy on March 09, 2023, 03:17:00 am ---although upon opening the 869s after its arrival, I have a feeling that the 786 would still be my preference due to its smaller form factor, besides, I love that EEVBlog logo and the blue!

--- End quote ---

I don't like big meters like the 869 on my bench unless it's for something specific.

joeqsmith:

--- Quote from: EEVblog on March 09, 2023, 02:53:00 am ---
--- Quote from: joeqsmith on March 09, 2023, 02:47:39 am ---For the 121GW, I measured 443 hours and 156 hours for the 789.  The 786 came in at 118 hours.   You can find that spreadsheet on-line or watch the review.  There are also posts were we have discussed the assumptions I have made when making these measurements.
--- End quote ---

I'm doing a video on this now. More as a generic thing, but the 786 is the example for battery estimation.

--- End quote ---

I made a source meter that makes these measurements automatically.  The spreadsheet includes the raw measured values and I would expect you to have similar results.   If you find that you are getting different results and have questions about the data I collected, feel free to ask for further information. 

J-R:
Surely there will be some minor power draw variances between one unit to another within a specific product's life cycle due to component variations or substitutions.

Oddly, my BM789 draws about 6.5mA from 4.8V to ~4V, at which point it actually drops a little to 6.3mA down to 3.7V.  (VDC switch position)

My 121GW varies from about 5.8mA to 6.2mA depending on function, and does not appear to be voltage dependent (4V-6.4V).

So that puts the BM789(all BM78x?) perhaps closer to 175 hours of runtime and the 121GW to 515 hours, based on the arbitrary 1,150mAh and 3,000mAh battery ratings I mentioned earlier.

The 121GW only adds another 10mA when the backlight is on compared to the BM789 which adds another 30mA.  So that is ~200 hours total for 121GW and ~30 hours total for BM789.

EEVblog:

--- Quote from: J-R on March 09, 2023, 04:04:26 am ---Surely there will be some minor power draw variances between one unit to another within a specific product's life cycle due to component variations or substitutions.

--- End quote ---

A little bit, but battery difference and temperature too should be the biggest variables.


--- Quote ---Oddly, my BM789 draws about 6.5mA from 4.8V to ~4V, at which point it actually drops a little to 6.3mA down to 3.7V.  (VDC switch position)

--- End quote ---

Mine draws 5mA in DCV, 9mA in DC+AC. 42mA with the backlight on.

EEVblog:

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