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

Need help with oscilloscope
Need help with oscilloscope
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
Thread Tools Search this Thread
Old 5th April 2008, 12:26 AM   #1
error0 is offline error0  Sweden
diyAudio Member
Join Date: Sep 2007
Send a message via ICQ to error0 Send a message via MSN to error0
Default Need help with oscilloscope


I have some problems with my Telequipment D67A oscilloscope and I was hopeing someone would be kind to help me sort it out.

The trace of for example a sine wave distorts around the x-axis where y = 0. If I offset the trace up or down it resembles the input signal more the further away from 0 it goes.

Please see image
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
  Reply With Quote
Old 5th April 2008, 02:04 AM   #2
cuibono is offline cuibono  United States
diyAudio Member
cuibono's Avatar
Join Date: May 2006
Location: City of Angles
Maybe you could try the yahoo group for tek oscilloscopes - there are some really knowledgeable people there. If you get a yahoo account, you can post...

  Reply With Quote
Old 6th April 2008, 01:22 AM   #3
unclejed613 is offline unclejed613  United States
diyAudio Member
unclejed613's Avatar
Join Date: Dec 2006
the oscope has a deflection driver similar to a class-B amplifier. looks like this one has a problem with crossover distortion. could be a bias problem in the deflection amp, causing a nonlinear gain change at the crossover point. the other possibility is that the distortion is from the sine wave generator (check it on another known-good scope). you will need a schematic and a calibration manual for the scope. the calibration manual will have the location of every adjustment in the scope. right now you want to concentrate on the V amp bias. the scope probably could use a good cal, but to do it properly you need test equipment that is very rare on the second-hand market, such as time-base standards and stairstep voltage standards.
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote


Need help with oscilloscopeHide 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
oscilloscope kit henryr Equipment & Tools 5 18th June 2009 10:08 PM
Oscilloscope XTAL Parts 0 18th March 2005 05:05 AM
PC or USB Oscilloscope owel Parts 9 31st March 2004 08:55 PM
How to use an oscilloscope SimontY Equipment & Tools 15 16th September 2003 10:46 AM
oscilloscope Kilowatt Digital Source 12 22nd January 2002 12:30 AM

New To Site? Need Help?

All times are GMT. The time now is 05:10 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio