I was doing some quality check on some new BM869 and BM867 that I have for sale on my store and I was thinking it can be interesting to document it.
This is very far from a complete calibration check but anyway it can give us a better idea of what accuracy you can expect from these multimeters (and for me give a reasonable confidence all those meters works correctly before selling it).
For these tests I’m using some precision equipment like a:
- Keythley 2001 7,5 digits multimeter,
- EDC MV116 DC calibrator
- HP 6181C current source
- Some new and used 0,005% and 0,01% Vishay resistors
Keithley 2001 is my golden standard and even if not calibrated since many years it’s proved to be few digits out of other two 6,5 digits multimeters (at least on DC range). Anyway it should be enough accurate to do some accuracy evaluations on these multimeters.
I have also an “old” BM869 that I brought one year and half ago and since than I’m using it like my main handled multimeter. I was thinking can be good idea to compare calibration also of this meter against the new ones.
Here is a table with results:
|Test||BM869 #1||BM869 #2||BM869 #3||BM867 #1||BM867 #2||BM867 #3|
|100 Ohm 0,005% (*)||100,14||100,14||100,17||100,13||100,13||100,14|
|10K Ohm 0,005%||9,999||9,998||10,002||9,996||9,997||9,997|
|100K Ohm 0,01%||99,97||99,97||100,02||99,93||99,94||99,97|
|5K Ohm 0,01%||5,000||5,001||5,003||5,000||5,001||5,001|
* please notice here there is some offset caused by the leads resistance. This was measured to be 0,17 Ohm
As you can see all meters are well within specs and the older meter does not exhibit any noticeable drift from the new multimeters.
I think it does not remains too much to say about this Brymen series except maybe one last thing: the calibration data is maintained in a flash rom mounted on the LCD assembly PCB.
Hope you appreciate it and hope it has some more “statistical” significate of the accuracy of these multimeters.
Thanks for reading this post up to here and if you liked it please share with your fiends, comment it and let me know what you think. CIAO – Domenico
Some photo shoot during tests.