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Brymen Crest and Min/Max Function VDC Capability

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splat2030:
As an update from my previous post, I have attached the email response I got today from Brymen technical support regarding the accuracy of the crest and min/max modes for the BM789 meter. Unfortunately, they confirmed my calculations that the meter accuracy decreases significantly as you range up in crest mode. I asked them to provide me a calculated accuracy for a crest measurement in each of the 3 lower ranges of 3 volts, 12 volts, and 80 volts. The results are as follows:

The accuracy of a 3 volt measurement is +/- .101 volt, the accuracy of a 12 volt measurement is +/- 1 volt, and the accuracy of an 80 volt measurement is +/- 10 volts. Looks like the crest function is pretty much useless for readings over 6 volts.

They also confirmed that regular min/max/avg mode cannot pick up a signal with a duration less than 300ms regardless of the fact that the meter samples every 100ms in this mode.

joeqsmith:
Happy to see you going to the source.   Brymen has proven to be very helpful when it comes to having an open dialog. 

splat2030:
Kind of a bummer though...I was secretly hoping Mr. Fungus was right on this one!

Fungus:

--- Quote from: splat2030 on September 21, 2022, 12:03:19 pm ---Kind of a bummer though...I was secretly hoping Mr. Fungus was right on this one!

--- End quote ---

Yeah.  :-\

NoMoreMagicSmoke:
I have to ask the dumb question. Why not just buy the correct tool for a battery load test... AKA a carbon pile??? They can be had for cheap from HarborFreight/NorthernTool/Amazon, and will be much more accurate of a battery health test than trying to measure the voltage while cranking the starter.


Something like this... https://www.amazon.com/WINMAX-TOOLS-AUTOMOTIVE-Alternator-Regulator/dp/B082PNSRXN/ref=sr_1_2?crid=YUD2LHFE8TGY&keywords=carbon+pile&qid=1663994835&qu=eyJxc2MiOiIzLjExIiwicXNhIjoiMi41NiIsInFzcCI6IjEuNzkifQ%3D%3D&sprefix=carbon+pile%2Caps%2C89&sr=8-2&ufe=app_do%3Aamzn1.fos.08f69ac3-fd3d-4b88-bca2-8997e41410bb

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