Products > Test Equipment
New EEVblog BM786 Multimeter
drussell:
--- Quote from: EEVblog on January 22, 2021, 02:04:14 pm ---
--- Quote from: drussell on January 22, 2021, 01:31:34 pm ---After watching Joe's video series, it looks pretty much perfect for me except for one aspect of one feature that I do use on a fairly regular basis, and that is being able to measure audio-frequency AC voltages to within a few percent, right up to at least 20 kHz. Joe's testing indicates that the -3 dB point is way down at 7-8 kHz, which would be really annoying to have to attempt correct for or carry another meter all the time for making AF measurements.
--- End quote ---
The BM789 does that.
I don't have a BM789 to compare, but it's the same PCB.
--- End quote ---
Yeah, I know... That's why I was wondering if it is a component-stuffing difference or a firmware difference.
I don't really need any of the "other" features on the 789, hence my question. :)
joeqsmith:
--- Quote from: drussell on January 22, 2021, 02:15:03 pm ---That's why I was wondering if it is a component-stuffing difference or a firmware difference.
--- End quote ---
Brymen provided me with a 789 as well which I plan to run soon. It has the latest firmware installed but may no longer be in calibration. The firmware is different for the 786 and 789.
I'll ask them about the BT interface. It would be nice to connect one of these up with LabView.
drussell:
--- Quote from: joeqsmith on January 22, 2021, 02:16:33 pm ---Brymen provided me with a 789 as well which I plan to run soon. It has the latest firmware installed but may no longer be in calibration. The firmware is different for the 786 and 789.
--- End quote ---
Ah, you have a 789 also... Sweet!
Obviously the 786 and 789 will have different firmware since the 789 supports the LowZ AutoV, dBm, has T2, etc. I'm just curious if the one spec difference of the ACV frequency is an intentional firmware limitation or if it is related to actual filter components on the PCB, thats all. My suspicion is that it is most likely a software limitation.
I would just like to know if you happen to notice any differences in the actual circuitry, thanks! :)
joeqsmith:
--- Quote from: drussell on January 22, 2021, 02:26:35 pm ---
--- Quote from: joeqsmith on January 22, 2021, 02:16:33 pm ---Brymen provided me with a 789 as well which I plan to run soon. It has the latest firmware installed but may no longer be in calibration. The firmware is different for the 786 and 789.
--- End quote ---
Ah, you have a 789 also... Sweet!
Obviously the 786 and 789 will have different firmware since the 789 supports the LowZ AutoV, dBm, has T2, etc. I'm just curious if the one spec difference of the ACV frequency is an intentional firmware limitation or if it is related to actual filter components on the PCB, thats all. My suspicion is that it is most likely a software limitation.
I would just like to know if you happen to notice any differences in the actual circuitry, thanks! :)
--- End quote ---
I have no idea what the hardware/firmware differences are. If you need a feature not available on the 786, I suggest just buying one that meets your needs rather than attempting to modify it. I use that 2 X K-type feature on the BM869s a fair amount. It's one of the reasons I bought it. The UNI-T UT181A also supports it.
EEVblog:
--- Quote from: drussell on January 22, 2021, 02:26:35 pm ---Obviously the 786 and 789 will have different firmware since the 789 supports the LowZ AutoV, dBm, has T2, etc. I'm just curious if the one spec difference of the ACV frequency is an intentional firmware limitation or if it is related to actual filter components on the PCB, thats all. My suspicion is that it is most likely a software limitation.
--- End quote ---
If they are smart then the firmware will be indentical, and only a single fuse bit determines what features it has.
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