Products > Test Equipment

Brymen BM867s ???

<< < (15/17) > >>

miro123:
I've tested my brymen 869s vs Fluke 187
Here are my findings.
 - BM869s shows the frequency up until 99.99Khz Fluke does not have this function at all
 - BM869s shows the frequency 1 digit lower - e.g. 80KHz shows as 79.99
Test setup
  - Rigol MSO5074 function generator set to amplitude 1V,  0Vdc
  - manual adjusted to pre-defined frequency
  - grapph shows normalized deviation to DMM own measurement at 50Hz
  - graph shows data up until specified 100KHz - both DMMs declines sharply above specified range
  - BM869 have strange overcompensation, personly I prefer the Fluke plot - #1 it is still acurate to specified range #2 Immune to nises above specification.
That siad - BM869s holds its own - BM869s flatnes up unitl 1KHz is implesive - maybe this parameter is more important in real live.

What is your opinion?
BR
Miro


        -


miro123:

--- Quote from: Domitronic on September 15, 2022, 03:45:04 pm ---
Hello,

i just did a quick test with my BM867s and a SDG1032X. Below is the result. I don't know whether the deviation is caused by generator or multimeter since my second multimeter is not here at the moment.

SDG1032X was set to 2,828V peak-peak in order to get approx 1V rms. BM867s was in auto range but remained in 5V range during all measurements.

Will test again when my Fluke multimeter is back to compare results.

--- End quote ---
Thanks for efforts and sharing,
Can you perform next measurements at 2Vpp - then we can easily compare them to other test results? - My & 2N3055
I observe the  following issues
  -  BM867s shows also the frequency 1 digit lower e.g x.99KHz instead of (x+1),00KHz -- same as BM869s
  -  huge difference in 0..100KHz range between BM869s/Fluke187 and BM867s  +-0,8% vs +-4%
  - already at 5KHz BM867s is 3% off - It is still within Brymen specs, but this is definitely showstopper for me.
  - Why BM867s characteristics goes up at MHz range? - what type of cable do you use, Do you terminate the coax cable at the end?
If the next BM867s measurement confirms the same characteristics - I'll byte the bullet and buy BM869s


Domitronic:

--- Quote from: miro123 on September 16, 2022, 09:02:55 am ---
Thanks for efforts and sharing,
Can you perform next measurements at 2Vpp - then we can easily compare them to other test results? - My & 2N3055

--- End quote ---

I could, but then the tolerance is even higher because it is below 15% of the 5V range. This means another 100 digits between 1kHz and 20kHz in addition to already very high 2dB.


--- Quote ---I observe the  following issues
  -  BM867s shows also the frequency 1 digit lower e.g x.99KHz instead of (x+1),00KHz -- same as BM869s
  -  huge difference in 0..100KHz range between BM869s/Fluke187 and BM867s  +-0,8% vs +-4%

--- End quote ---

As you can see in my results my BM867s is already more than 8% off at 100kHz.


--- Quote ---  - already at 5KHz BM867s is 3% off - It is still within Brymen specs, but this is definitely showstopper for me.
  - Why BM867s characteristics goes up at MHz range? - what type of cable do you use, Do you terminate the coax cable at the end?

--- End quote ---

I did not test in MHz range, only up to 150kHz as you can see in my results. Looks like the BM867s is definitely the wrong meter for you. Above 1KHz the specified tolerance is 2db. So not really usabale if 3% are already a showstopper for you. And above 20kHz its not even specified. I would recommend to just get the BM869s or any other meter that meets your requirements. Its wasted money to buy a meter that doesn't meet your requirements.

miro123:
Thanks everyone who help me clarify my next purchase.
I'm power electronics/software developer.
The most signals that I measure are distorted, with higher harmonics and even worse, the pwm signals are still visible somehow. That is mostly true during development phase. The final product is good .
Thanks
Miro

2N3055:

--- Quote from: miro123 on September 16, 2022, 10:17:34 am ---Thanks everyone who help me clarify my next purchase.
I'm power electronics/software developer.
The most signals that I measure are distorted, with higher harmonics and even worse, the pwm signals are still visible somehow. That is mostly true during development phase. The final product is good .
Thanks
Miro

--- End quote ---

What are you trying to measure exactly? Is DMM right tool for that?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod