Brymen 829 - Page 1
Forum section: electronics / testgear

author: jura
author_rank: Newbie
timestamp: February 08, 2015, 01:39:00 pm
content: Hello.This is my first post on this forum and i want to ask few questions about Brymen BM 829s which i have purchased yesterday.I have try to measure output voltage on VFD (Commander SK) with input 230V, 50 Hz.The readings was not even close to V/f ratio which is 4.6 (230/50=4.6).But, on my old analog multimeter readings were almost correctI have start with 50 Hz and then start decreasing frequency on 40, 30, 25, 20 and finished with 10 Hz.Is this normal or i don't know the right way to measure this?Or maybe this can't be done with this multimeter?

author: omgfire
author_rank: Regular Contributor
timestamp: February 08, 2015, 02:42:03 pm
content: Look at VFD columnhttps://www.eevblog.com/forum/testgear/multimeter-spreadsheet/And Fluke app note:6. Multimeter measurements on variable frequency drives87V Troubleshooting adjustable-speed motor drivesUNI-T UT210E for $33 or Uni-T UT139C for $50 support V.F.C.Brymen 829 does not.

author: jura
author_rank: Newbie
timestamp: February 08, 2015, 07:47:23 pm
content: It seems i made mistakeAnd Amprobe Am 550-EUR would be a better choice for me i think...

author: jura
author_rank: Newbie
timestamp: February 09, 2015, 07:27:15 pm
content: Since i will return BM 829 back to TME, can you give me some advice about which MM will be a better choice, AMPROBE AM 550 (147€) maybe, BRYMEN BM 907 (91€) or something third.Brymen 869 will cost me 50€ in addition (BM 829 is 190€)...I work most of the time with VFD-s (that's why is VFD feature so important to me), but sometimes in substations and all other jobs in maintenance.

author: JohnnyBerg
author_rank: Frequent Contributor
timestamp: February 09, 2015, 07:31:06 pm
content: Quote from: omgfire on February 08, 2015, 02:42:03 pmHaha .. what was it again Dave said about UNI-T meters?

author: omgfire
author_rank: Regular Contributor
timestamp: February 09, 2015, 07:51:20 pm
content: I'm no expert. From specs:Brymen BM907 CAT IV 300VAmprobe AM-570 CAT IV 600VBrymen BM869 CAT IV 1000VHave you look at Hioki (DT4251, DT4252, DT4253)?

author: Wytnucls
author_rank: Super Contributor
timestamp: February 09, 2015, 08:02:58 pm
content: For commercial use, I would get either a Gossen Tech M243A, Agilent 1271A or Fluke 87 V, no matter how expensive. Brymen 869 second choice. They all do VFD.

author: jura
author_rank: Newbie
timestamp: February 09, 2015, 10:07:01 pm
content: Those three are out of my reach right now...What means when in datasheet writes, under Low Pass Filter----Accuracy---- 45 Hz - 400 Hz - ±(1.0%+3LSD)?What is under 45 Hz, just lower accuracy or totaly incorrect voltage readings?Because many motors turning under 45 Hz.

author: andrija
author_rank: Regular Contributor
timestamp: February 09, 2015, 10:23:25 pm
content: In your particular situation since you bought from TME, just upgrade to 869, it will cost you extra 50 euro as you said. I don't see why it would be inferior to a Fluke for your (or any other) purpose.

author: omgfire
author_rank: Regular Contributor
timestamp: February 10, 2015, 06:40:51 am
content: Quote from: jura on February 09, 2015, 10:07:01 pmDM-860A / BM869

author: jura
author_rank: Newbie
timestamp: February 10, 2015, 12:59:02 pm
content: Quote from: andrija on February 09, 2015, 10:23:25 pmYes, i believe that will be the solution.Hvala.