Brymen BM869 BM867 batch calibration check

This is just a short follow up to the many BM86X reviews you can found on internet (fg. here or here).

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
DC 5,0000V 5,0004 5,0003 4,9999 4,9998 4,9997 4,9996
DC 10,000V 10,000 10,000 9,9999 9,9999 9,9998 9,9998
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
500uA 500,02 499,97 499,98 499,96 499,94 499,97

* 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.

If you liked this multimeter and want to buy one it is available in my shop →here or if you feel more comfortable you can buy it also form my store at eBay.

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

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Some photo shoot during tests.

Check of 5V and 10V DC range

 

5.0000V DC Test

5.0000V DC Test

10.000V DCV test

10.000V DC test

Check of 100 Ohm 0,005% resistor (leads contribute to +0,17ohm)

 

a

100 Ohm 0,005%

a

100 Ohm 0,005%

a

100 Ohm 0,005%

a

100 Ohm 0,005%

a

100 Ohm 0,005%

a

100 Ohm 0,005%

Check of 10K Ohm 0,005% resistor

 

a

10K Ohm 0,005%

a

10K Ohm 0,005%

a

10K Ohm 0,005%

a

10K Ohm 0,005%

a

10K Ohm 0,005%

a

10K Ohm 0,005%

Check of 100K Ohm 0,01% resistor

 

a

100K Ohm 0,01%

a

100K Ohm 0,01%

a

100K Ohm 0,01%

a

100K Ohm 0,01%

a

100K Ohm 0,01%

a

100K Ohm 0,01%

Check of 5K Ohm 0,01% resistor

 

a

5K Ohm 0,01%

a

5K Ohm 0,01%

a

5K Ohm 0,01%

a

5K Ohm 0,01%

a

5K Ohm 0,01%

a

5K Ohm 0,01%

Check of 500uA

 

a

500uA

a

500uA

a

500uA

a

500uA

a

500uA

a

500uA

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