Products > Test Equipment
Brymen BM869 - measurement of DCV linearity
dadler:
--- Quote from: Dr. Frank on May 04, 2015, 08:02:08 am ---
DCV: deviation specification
1000.17V +0.017% (0.15%/yr.)
Therefore, these ranges are well inside specification, only 1000V DC was a little bit outside.
--- End quote ---
I am confused - how is the 1000V outside of the spec?
wraper:
--- Quote from: Dr. Frank on May 04, 2015, 08:02:08 am ---1000.17V +0.017% (0.15%/yr.)
--- End quote ---
--- Quote ---Therefore, these ranges are well inside specification, only 1000V DC was a little bit outside.
--- End quote ---
I don't see figures matching with what you wrote.
Dr. Frank:
Sorry, 1000V was also well inside spec, like the other DCV ranges.
I corrected my statement already.
Anyhow, the annual drift in DC mode is quite close to the specified limits, therefore an annual calibration really is necessary.
Other brands may have better stability margin.
Frank
Lightages:
I wonder if the new new revision, BM869s, would have a different drift or at least less error on the ohms range. Brymen revised the input protection and so maybe there is a difference. Staying within spec for a year is pretty good, but not as good as I had expected.
miro123:
I have pretty much the same experiance with Brymen BM869s
I've bought BM869s two years ago.
The multimeter has tendency to shows more in DC voltage ranges since the begining but it was acceptable.
The situation got worse since the device started to deviate further away from my 3 Fluke 187 /189s
It triggers me to do calibration + adjustment. AT the moment I did it only at few DC ranges. My two HP3456 ,one HP34970A and ARRAY 3500 are spot on. T=23.2C Rh=45% for at least 24h. Here are the result
DCV: deviation specification
500.126mV +0.025% (0.02%/yr.)
5.00124V +0.025% (0.02%/yr.)
50.0011V +0.022% (0.03%/yr.)
500.118V +0.024% (0.04%/yr.)
The number itself does not say a lot. I don't have any tracking history. I will try to be more more accurate and repeat the measurements 1 year later.
What do I mean with tracking history
1. I ve ordered via local Dutch shop www.eleshop.nl. I don't know how long it stayed at shop shelf.
2. I don't know how big was the deviation when I bought it 2 years ago.
I have one question - can I find back the production date of my BM869s - any sticker or serial number?
==============
I've checked my two fluke 187/189 out of curiosity. They they deviate +-50...+90ppm in DC range +-500mV,5v,50V,500V. It is really impressive numbers for 20+ years multimeter. Flukes have never seen any calibration/ajdustments.
Another question :Does somebody/except Mr.Frank and me/ did an long term stability check of those brymen meters?
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