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New EEVblog BM786 Multimeter

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joeqsmith:

--- Quote from: rsjsouza on October 24, 2020, 11:09:35 am ---The 500k count is just a trend viewer - useful for charges and discharges, but with very loose accuracy. Something similar to the 20k count mode of the 87V.

What I really want to see is if the BM786 in 60k count is snappier than Keysight's U1282A.

--- End quote ---
I tend to agree.  It's common that I am more interested in relative numbers than absolute.  How much something drifts for example.   It's proven to be useful. 

rsjsouza:

--- Quote from: joeqsmith on October 24, 2020, 04:23:43 pm ---
--- Quote from: rsjsouza on October 24, 2020, 11:09:35 am ---The 500k count is just a trend viewer - useful for charges and discharges, but with very loose accuracy. Something similar to the 20k count mode of the 87V.

What I really want to see is if the BM786 in 60k count is snappier than Keysight's U1282A.

--- End quote ---
I tend to agree.  It's common that I am more interested in relative numbers than absolute.  How much something drifts for example.   It's proven to be useful.

--- End quote ---
Yes, for that the 500k count mode is great.

BTW, congratulations on getting the new Brymen as an exclusive. I'll watch the video later.

EEVblog:

--- Quote from: rsjsouza on October 24, 2020, 11:09:35 am ---What I really want to see is if the BM786 in 60k count is snappier than Keysight's U1282A.

--- End quote ---

It'll do 10 times/sec updating in capture mode, so fast it's a bit disconcerting.

rsjsouza:

--- Quote from: EEVblog on October 24, 2020, 11:43:31 pm ---
--- Quote from: rsjsouza on October 24, 2020, 11:09:35 am ---What I really want to see is if the BM786 in 60k count is snappier than Keysight's U1282A.

--- End quote ---

It'll do 10 times/sec updating in capture mode, so fast it's a bit disconcerting.

--- End quote ---
Thank you. I meant the settling rate of the autorange but that is quite a good rate as well. 

After watching Joe's video, I could tell the two seem to use different approaches for the autorange. I did a side-by-side comparison timing with the ohms and capacitance ranges (the ones where the lag is larger). Joe mentioned 15s to settle on the 40M measurement, while my Keysight was about 2s. This was becoming less dramatic as resistance decreased, with a crossing point of performance somewhere (didin't verify) and  the Keysight becomes slower to the point of taking almost 6s to read my 33 ohms resistor, while the Brymen becomes significantly faster.

Conductivity tests were similar in speed (perhaps because there are not many ranges to cycle).

I also saw an edge for the Keysight on the capacitance - not very dramatic, but both seem to pale in comparison to others such as the 87V, the UT61E or the U1273A. Voltages and current seemed quite equivalent.

I took these timings from Joe's video, thus this is not a definitive conclusion to the autorange performance at all.

joeqsmith:
That's correct.  It's very slow in resistance with values over 10M, on the order of 10-15 seconds to settle with the 40M.  From the video, you can also see the 150pF took a fair bit of time but then so did the 100uF.   Part 2 will include a few more speed comparisons.       

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