Products > Test Equipment
New EEVblog BM786 Multimeter
rsjsouza:
--- Quote from: joeqsmith on October 25, 2020, 01:52:30 pm ---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.
--- End quote ---
Ah, I got confused there. The 150pF on the Keysight was instantaneous (as with everything below 1uF) but the 100uF was about the same between the two.
BTW, I measured mine with a 100M resistor
joeqsmith:
The manual shows the high end for this meter is 60M. They show a 0.1uA current for the 6M range and 0.01uA for the 60M range.
If you wanted some closer numbers to compare it with yours, just let me know the value and we can set it up with the counter and high speed camera.
rsjsouza:
--- Quote from: joeqsmith on October 25, 2020, 03:08:14 pm ---The manual shows the high end for this meter is 60M. They show a 0.1uA current for the 6M range and 0.01uA for the 60M range.
If you wanted some closer numbers to compare it with yours, just let me know the value and we can set it up with the counter and high speed camera.
--- End quote ---
Ah, no worries. I think the ballpark is accurate enough to expose how the two multimeters somewhat compare with each other in the capacitance and the ohms.
joeqsmith:
No problem. It may be a while so if you come up with something later, I'm fine with it.
wizard69:
--- Quote from: radiolistener on October 23, 2020, 01:25:34 pm ---The first thing that catches my eye is that this new DMM has 60000 count instead of 500000 count like BM-867/869.
What is the reason to use less than 500000 count chipset for modern DMM?
--- End quote ---
The first thing that comes up when I see comments like this is how accurate are those 500,000 count hand held DMM's?
The second thing that comes to mind is how often do you really need to resolve to that many digits in a handheld. If I'm about to calibrate something I will use a device (handheld or not) that is designed for the task at hand. More importantly that device will be on some sort of calibration schedule. Most DMM's of the handheld variety are seldom kept on a stringent cal program. That is the case in the hobby world as well as the commercial world.
60,000 counts in a handheld device is a bit of a luxury as in many use cases you can get buy with 3-4 digits easy. In fact sometimes you are better off with fewer digits. Sometimes too much info is a bad thing. By the way I'm not trying to say that high precision and high resolution is a bad thing in a handheld meter, just that for many users it really serves no purpose.
For example at work I'm involved in industrial systems under 600 VAC and similar for DC systems. I can't ever remember needing to know the voltages on such systems beyond the first decimal point. At lower control system voltages under 24 VDC you seldom need to know what power supplies are doing beyond the second decimal point. It is only when you get involved in instrumentation that accuracy and resolution are important for calibration work, at that point you are working with traceable instruments anyways. So 60,000 counts is more than good enough in this context.
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