Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Dual sinewaves?
Dual sinewaves?
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 1st June 2020, 10:08 PM   #1
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Default Dual sinewaves?

I am messauring a 1khz signal trough a phonostage i bought on ebay.
But how come I get dual sine waves,I only use one channel on the scope.
Anyone...

Dual sinewaves?-dual-sine-waves-jpg
Attached Images
File Type: jpg Dual sine waves.jpg (207.5 KB, 319 views)
__________________
Regards Åke
  Reply With Quote
Old 1st June 2020, 10:55 PM   #2
rayma is offline rayma  United States
diyAudio Member
 
Join Date: Apr 2011
The triggering is probably set wrong, try auto.

Last edited by rayma; 1st June 2020 at 11:06 PM.
  Reply With Quote
Old 1st June 2020, 11:03 PM   #3
Michael Bean is offline Michael Bean  United States
diyAudio Member
 
Michael Bean's Avatar
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
Vertical mode is set wrong.

Mike
__________________
Where we have strong emotions, we're liable to fool ourselves...Carl Sagan
They say I'm lazy, but it takes all my time...Joe Walsh (The Musician)
  Reply With Quote
Old 1st June 2020, 11:54 PM   #4
as_audio is offline as_audio
diyAudio Member
 
Join Date: May 2008
It is hum.
  Reply With Quote
Old 2nd June 2020, 02:32 AM   #5
Refugee1 is offline Refugee1  United Kingdom
diyAudio Member
 
Refugee1's Avatar
 
Join Date: Jul 2012
Location: Worksop
Quote:
Originally Posted by as_audio View Post
It is hum.
Spot on.
Mains hum for certain.
  Reply With Quote
Old 2nd June 2020, 06:07 AM   #6
Enzo is online now Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
SLow down your sweep to see the 1kHz wave modulated up and down with the hum. As it is, your sweep is causing images at different spots in the cycle.
  Reply With Quote
Old 2nd June 2020, 09:21 AM   #7
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Yes I´ve listened to it and there is hum.
this is the best I can get turning the trigger.
If I push a button "X10 MAG" I get 1 sinewave,but its dancing arould on the screen.
__________________
Regards Åke
  Reply With Quote
Old 2nd June 2020, 08:02 PM   #8
Enzo is online now Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
X10 is opposite of what you need. That expands the 1kHz wave and the dancing is the 60Hz modulation. SLOW the trace down and you should be able to see the 1kHz AND 60Hz components. it isn't a very practical way to view things for troubleshooting, but it should demonstrate what you are really looking at.
  Reply With Quote
Old 2nd June 2020, 08:41 PM   #9
as_audio is offline as_audio
diyAudio Member
 
Join Date: May 2008
50 Hz

This stage is probably without case or shielding ?
  Reply With Quote
Old 3rd June 2020, 07:35 AM   #10
Vovk Z is offline Vovk Z  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: Kyiv
If we suggest the oscillograph is working well, then that picture usually means an amplitude-modulated signal and the user chose a wrong synchronization (channel X) mode. (1kHz modulated by 50 Hz or something similar).
  Reply to this post

Reply


Dual sinewaves?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[DAC REVIEW] Weilang Audio DC-100 Dual AK4497 + Dual Talema PSU daniboun Digital Line Level 6 16th February 2020 11:02 AM
How to make complex waveforms with sinewaves, the power of Fourier cbdb The Lounge 3 17th July 2019 11:51 PM
Who wants 2SK194 Dual Jfets, C3381/A1349 Gr dual pair BJT? Junm Swap Meet 0 28th October 2015 03:17 PM
50VA Toroidal Transformer Dual Primary 120/120 and Dual Secondary 15/15 KatieandDad Swap Meet 3 11th February 2012 06:26 AM
Sanctified Sinewaves: Jim Williams' Ultrapure Oscillator dchisholm Equipment & Tools 2 12th August 2011 04:08 AM


New To Site? Need Help?

All times are GMT. The time now is 04:51 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki