Products > Test Equipment
Brymen BM789
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AVGresponding:
One wonders if the same mod as applied to the 869S for the same problem (on a higher range, granted) might work to prevent this?
EEVblog:
For those interested in the exact details here:


--- Quote ---uses hi-speed AD conversion data to do Auto-ranging mechanism. After switching from 600Ω Range to 6kΩ Range, firmware used the first hi-speed AD conversion data to deduct "600Ω Range Offset" to check if further Range-Switching was in need. In case "600Ω Range" and "6kΩ Range" have significant offset difference, the unit may not be able to converge the measurements at around 640Ω ~ 660Ω region in auto-ranging operation mode. Thus not every unit will have this bug. Only the unit with extreme offset difference case has this bug.

Our engineer has modified the firmware to fix this bug. After switching from 600Ω Range to 6kΩ Range, the update firmware version uses the first hi-speed AD conversion data to deduct "6kΩ Range Offset" instead to check if further Range-Switching is in need.
--- End quote ---
NoMoreMagicSmoke:

--- Quote from: EEVblog on August 22, 2022, 04:22:13 am ---Our engineer has modified the firmware to fix this bug. After switching from 600Ω Range to 6kΩ Range, the update firmware version uses the first hi-speed AD conversion data to deduct "6kΩ Range Offset" instead to check if further Range-Switching is in need.
--- End quote ---
[/quote]

Well, that blowa.a hole in my theory. That sounds like a straight up copy paste typo...
pazuwu:
Did Brymen say in which firmware version was this corrected?
J-R:
Couldn't reproduce the issue on my 78905 at any of the range transitions.

~655.xx does show as 0.622xx for a full second before settling on 0.655xx.  Also noticed the same behavior if you switch to mV and back at that approximate value.
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