"David Billington" wrote in message ...

On 13/01/2021 20:06, Jim Wilkins wrote:
"Bob Engelhardt" wrote in message ...

Jim - you have posted about your Bayite DC all-in-1 meter:
https://www.amazon.com/bayite-6-5-10...dp/B013PKYILS/

Do you know if it measures true RMS, or does it measure average? My
interest is mainly for full wave rectified AC, it is usually not a clean
1/2-wave sinusoid.

Thanks, Bob

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I don't trust those things to read pure DC accurately or hold their
calibration, and check them against a lab-grade 1.000 milliOhm shunt when
it matters. I think as a rule the maker clearly tells you if a product can
read RMS, otherwise assume it reads Average.

You might look into the UT-61E if you need accurate RMS readings for hobby
use.
https://www.amazon.com/UNI-T-Digital...06XSYZZBV?th=1


I've got the UT70B one that has RS232 output which has proved useful for
some temperature data logging. I found some code online to unscramble
the data output and incorporated it into some force/torque testing
software I maintained at the time so I could analyse the data, it
already handled RS232 input so just need a handler to decode the data
from a new instrument. Found the receipt in the box and it's now 10
years old and still all good.

---------------------------------------

I've written meter decoder code too, so I could switch off a battery
discharge load at a low voltage threshold. This may be helpful:
https://sigrok.org/

Meters that transmit their display segment patterns are easy to decode with
a Select Case.

Otherwise I use the meters' programs and combine the separate .csv data
files in a spreadsheet by aligning the time stamps.