jonnyGURU Forums
Home Site Search Reviews Articles Contest Links PSU FAQs  


Go Back   jonnyGURU Forums > Site and Forum Topics > Testing Methodology Discussion

Testing Methodology Discussion Questions and comments regarding the testing methodologies used on jonnyguru.com

Reply
 
Thread Tools Display Modes
  #11  
Old 10-07-2014
Oklahoma Wolf's Avatar
Oklahoma Wolf Oklahoma Wolf is offline
Me fail English? That's unpossible!
 
Join Date: Oct 2006
Location: Moderator
Posts: 6,421
Thanks: 116
Thanked 1,189 Times in 338 Posts
Default

It could easily be the same meter internally.

If I have one criticism of the Rek, it's that the 2A range isn't very accurate above 25W or so. I always have to start my testing by throwing it into 20A mode manually and keeping it from autoranging, or it reads power draw high and everything fails 80 Plus.

The only time I use 2A mode is for standby measurements. That's the only time it's useful.
Reply With Quote
  #12  
Old 06-24-2015
Behemot Behemot is offline
Banned
 
Join Date: Aug 2013
Location: 50°4'53.169"N, 14°23'30.699"E
Posts: 1,578
Thanks: 90
Thanked 249 Times in 183 Posts
Default

As for these cheap meters, the problem is with harmonics and PFC. If the corrections lets too many of them pass, the meter cannot measure the higher-frequency ones. You can believe its reading for ordinary (resistance, capacitative or inductive) load, it is fairly OK for SMPS with good PFC, it can measure BS for SMPS with passive or no PFC at all.

The rest usually does not matter - it is some board with one tiny IC which measures voltage and current with some frequency on a current shunt. Most of the differences are what frequency it uses and the physical appearance (display, buttons).

And oh, do not ever hook them on non-sine-wave output. I killed my Energy Monitor 3000 hooked onto that APC extender with integrated batteries (running from them).

Anyway there are some chinese companies (Everfine is one of them) which make nice power analyzers and more instruments, we would like to start reselling some in Europe so if anybody is interested…I've seen battery ESR meters, nice clamp meters, multimeters etc. Some of them almost reach on japanese devices, sure you won't get the same built quality and service/support, but some have SW provided and they cost half the price of japanese device. Not for everyday professional heavy-duty use, but entry-level professional why not.

I'll probably start with the power analyzer as I can use that myself over that child toy wall meter. If I like it, we jump on it.
Reply With Quote
Reply

Tags
accuracy, consumer, meter, power, standby

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:22 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright © JonnyGURU.com 2000 -