Products > Test Equipment
New EEVblog BM786 Multimeter
EEVblog:
--- Quote from: SebastianH on February 05, 2023, 03:23:11 pm ---Maybe I'm missing something, then I have to apologize... Is there any official (or inofficial) calibration & adjustment procedure available to regular customers? From my quick experiments it seems like you enter the cal mode by switching the BM78x off, pressing and holding REC and then selecting Resistance (within 1 sec or so; CALi is displayed). But it would be very helpful to know when the meter saves the constants (Press SELECT?) and also whether it's possible to only calibrate certain ranges (don't really care about 300V and 1000V and don't have the equipment to do that properly anyway). Switching it off after the -30.000V point seems to either disregard any other setting or I did something else incorrectly.
--- End quote ---
Brymen do not release their calibration procedure publicly.
SebastianH:
Ok, good to know. Thanks anyway!
JDW:
What is the expected BATTERY LIFE for the BM786 with fresh Alkaline batteries, backlight off?
We know the 121GW is 500 hours with BT and the backlight off, so I'm curious about the BM786.
J-R:
This greatly depends on the mAh capacity of the batteries. The power consumption for various modes is listed on page 22 of the manual. You can run the calculations and get a number based on ideal conditions.
JDW:
--- Quote from: J-R on March 08, 2023, 08:50:51 am ---This greatly depends on the mAh capacity of the batteries. The power consumption for various modes is listed on page 22 of the manual. You can run the calculations and get a number based on ideal conditions.
--- End quote ---
One could argue the same about the 121GW, yet it's manual says >500 hours, which is a nice guide to have. Not too precise maybe, but still a nice rough estimate, which is really all I am seeking.
I don't know the best way to calculate battery life for the BM786. If all the batteries are in series, then we would take the mAh rating of one, and I assume that to be about 850mAh for a single Alkaline AAA, which at an 8mA meter draw (I do DC work, not AC) would mean just over 100 hours:
https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-battery-life
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