!!

Welcome to our Forum, extension and content sharing platform of Electrical Test and Measurement Product Reviews Blog.

 
Registration this is Free, we accept contributors of 17 years old and above. We do not accept registration with Gmail

Active since 7 June 2012  


Copyright Notice: Entire ITTSB.EU content & images they are copyright protected. - Forum search engine disabled to Guests - No need of you using Adblock software.

Author Topic: Laboratory power supplies  (Read 5128 times)

0 Members and 1 Guest are viewing this topic.

giorgos

  • Guest
Laboratory power supplies
« on: August 10, 2013, 09:40:57 PM »
As you know, power supply is one of the most important instruments in any lab. Older models was based in linear design (transformer, rectifier, regulation and adjustment circuit) that was a reliable reciept but with the disadvantage of low efficient rate. As years passed, switching mode power supplies appeared primary in consumer electronics, computers etc. having many advantages like efficient, light weight and small size. Our main disadvantage is output noise, something unusefull in laboratory power supplies. Some manufacturers like Hameg claims that in their models, they follow complex design , that combines linear and switching design in order to get only the advantages of any type. You think that is appliable? or you prefer linear or switching design?

Also allow me to make a suggestion. I think that it would be a good idea, to create a seperate section about power supplies in ITTSB forum, because power supplies is a major part of instruments.

Online Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Location: Greece
  • Posts: 2203
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
Re: Laboratory power supplies
« Reply #1 on: August 12, 2013, 09:01:27 PM »
My vote goes to linear ones, much less heat and long term stability.
When I hear the word switching it comes in my mind blown capacitors and LCR meters.

I have assembly with my hands over thirty 3-30V power supply units, and many more stabilized ones.
Low Ripple and voltage & current limiters always was features of the 1000 EUR solutions with advanced electronics.

Yes I will have to admit that modern switching type PSU can offer too voltage & current limiters in their output, but they can not handle more than 1-3A.

By my opinion everything goes down to personal requirements, for example all my personal needs are well taken cared by my Kenwood PD35-10 ( 0-35V  0-10A).
It gets permanent cooled by a 120mm fan and works rock solid in my hands since 1995. 


 
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

giorgos

  • Guest
Re: Laboratory power supplies
« Reply #2 on: August 13, 2013, 12:19:58 PM »
Ι prefer linear too, its also easier for anyone who wants to build by his own, a lab power supply ( as i had done already too), to choose a linear design.
I would like to thank you too , for adopting my idea, to create a seperate section in forum about power supplies.

Online Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Location: Greece
  • Posts: 2203
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
Re: Laboratory power supplies
« Reply #3 on: August 13, 2013, 12:45:32 PM »
to build by his own,

Unfortunately even the oldies linear designs they do have a high complexity level regarding their circuitry for proper voltage stabilization / DC filtering / voltage & current limiters.
But in the case of DIY PSU the good part is that the up-come represents your full set of knowledge and experiences in electronics at the time that you will make one.  :)

My most powerful PSU even today is my DIY version at 3-30V / 30A,  I build it so to feed 4X MRF317 ( in my youth 1991)  :)

http://www.ittsb.eu/forum/index.php?topic=735.0
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

 

ITTSB.EU Blog

General Data Protection Regulation GDPR ITTSB.EU Home Page Reward us by a Donation - Sponsorship TsDMMViewer Data Logger for FLUKE 884xA

ITTSB Blog - Sponsors

protosnet.com - Internet solutions FLUKE benchtop DMM Repair Services

Recommended Links

Hellenic Accreditation System E.SY.D. Portal of city Volos - Greece Clean Up and Customize Facebook Firefox Backup Tool 32bit / 64 bit Winaero Tweaker = Win7 Fonts size fix