This is how my mains looks like - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 14th March 2012, 01:03 PM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
Default This is how my mains looks like

220V/50Hz country. is this good, decent, crappy?
Attached Images
File Type: jpg mains.jpg (382.0 KB, 474 views)
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 14th March 2012, 01:20 PM   #2
diyAudio Member
 
Join Date: Sep 2009
Location: Timisoara
In what romanian city is this? I currently live in Timisoara; I remember looking at the mains a few years ago and it was a perfect sine. I'll take another look in the evening.
  Reply With Quote
Old 14th March 2012, 01:22 PM   #3
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
The sheared off top is typical for a heavy rectifier-type load, where at the wave top the diodes start to conduct and try to recharge the reservoir caps in the few mSecs before the mains drops below the cap voltage again.

jan didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 14th March 2012, 01:47 PM   #4
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
@rrrremus:
this is in Iasi, practically the opposite end of the country. large block of flats (88 of them), it has its own transformer station.


@Jan
measurement was taken approx at noon. powered appliances were:
- small car battery charger (SMPS powered)
- other small switch-mode supplies (2 laptop chargers and one external HDD)
- amplifier SMPS (in stand-by)
- DAC - linear supply, in stand by
- fridge
- LCD TV (on)
- gas water central
- gas sensor
- no light was on (most are economic type)

I measured at 2 different outlets in different rooms, no change. I'll remeasure with all appliances disconnected. I used laptop sound card (noise floor at ~-100dB, distortion is 2nd order at -80dB, measured with my DAC output), running off battery, obviously.
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 14th March 2012, 01:59 PM   #5
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Mains is dirty, and depending on how the supply infrastructure is can be horrendous, especially near industry or high concentrations of HVAC (ie office blocks).
  Reply With Quote
Old 14th March 2012, 02:05 PM   #6
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
Quote:
Originally Posted by marce View Post
Mains is dirty, and depending on how the supply infrastructure is can be horrendous, especially near industry or high concentrations of HVAC (ie office blocks).
last time I measured was ~10 years ago. I think that it looked much better then. but much has changed meanwhile. TBH I'd be really surprised if this was because of something inside my house.
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 14th March 2012, 02:53 PM   #7
diyAudio Member
 
zigzagflux's Avatar
 
Join Date: Oct 2006
Location: Charlotte, NC
It's both; on the grid as well as in your house. Typical waveform spectrum now that a greater percentage of load is electronic supplies with capacitor input. Will only get worse as the world transitions out of incandescent lighting.

Normal. Typical. Unavoidable.
  Reply With Quote
Old 14th March 2012, 03:43 PM   #8
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
measured again with everything except the gas sensor off. no difference whatsoever.
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote
Old 14th March 2012, 03:50 PM   #9
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by mr_push_pull View Post
measured again with everything except the gas sensor off. no difference whatsoever.
Quote:
Originally Posted by zigzagflux View Post
Normal. Typical. Unavoidable.

I would like to extend this discussion to another mains quality issue. Power Factor correction.

Is this a suitable place?
__________________
regards Andrew T.
  Reply With Quote
Old 14th March 2012, 03:52 PM   #10
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
sure, there's not much to discuss about my mains
__________________
we all love a good ol' stereotype until it's against us
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mains Cables R Us Silver Plated Mains Block mainscablesrus Mains Cables R Us 4 9th August 2012 01:11 AM
mains filter ccereda Power Supplies 35 29th January 2012 12:26 PM
mains overvoltage what to do? tubo Tubes / Valves 7 11th December 2009 11:49 AM
MAINS... simple, old style amplifier, plugged into mains electrical outlet (110) destroyer X Solid State 2 15th June 2008 03:31 PM
cleaning up the mains NAP 160 Everything Else 1 25th July 2002 07:35 AM


New To Site? Need Help?

All times are GMT. The time now is 01:50 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2