Tektronix 2235 - What have I done wrong ? - UK Vintage Radio Repair and Restoration Discussion Forum

Daventry 5XX · 5th Jul 2013, 3:18 pm

Hi All

My eagerly awaited Tek 2235 arrived today.

On power up everything looked fine with 2 sharp horizontal traces,exactly as it should be.

After a couple of minutes of knob twiddling to familiarise myself with the controls the screen went blank.

After lots more twiddling I managed to get back 2 dots doing a very slow horizontal sweep across the screen.

No matter what I do I cannot get the 2 traces back,can someone please tell me what I am doing wrong ?

Alan

davidgem1406 · 5th Jul 2013, 3:35 pm

Sounds like you moved the timebase speed to a very slow sweep time.

Dickie · 5th Jul 2013, 3:38 pm

And possibly turned off automatic triggering.

Daventry 5XX · 5th Jul 2013, 3:58 pm

Thank guys

now working correctly again - you live and learn

Alan

Vicboduk · 5th Jul 2013, 3:58 pm

Hi Alan, here is a link to the manual for this scope. Page 29 shows the settings required to give a base line trace. The most common trap for the uninitiated is the trigger controls. When in doubt make sure that it is in the 'Auto' position, this should make sure that something is displayed.

Vic

p.s. Richard beat me to it!

Daventry 5XX · 5th Jul 2013, 4:04 pm

Thanks Vic

I'll print it off before I do any more fiddling

Alan

Vicboduk · 5th Jul 2013, 4:29 pm

Moderators, could you please delete this. Somehow a duplicate second post appeared!

Vic

Andrewausfa · 5th Jul 2013, 5:44 pm

Alan,

Have a look at some of the videos made by Alan Wolke on Youtube. In particular, his scope basics videos are ideal if you're wanting to learn which switch does what on your new scope.

http://www.youtube.com/user/w2aew

You can go direct to his 'Basics and Tutorials on Scopes' videos here

http://www.youtube.com/playlist?list=PL746BF38BC2E068E0

Andrew

5th Jul 2013, 3:18 pm	#1
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Tektronix 2235 - What have I done wrong ? Hi All My eagerly awaited Tek 2235 arrived today. On power up everything looked fine with 2 sharp horizontal traces,exactly as it should be. After a couple of minutes of knob twiddling to familiarise myself with the controls the screen went blank. After lots more twiddling I managed to get back 2 dots doing a very slow horizontal sweep across the screen. No matter what I do I cannot get the 2 traces back,can someone please tell me what I am doing wrong ? Alan

5th Jul 2013, 3:35 pm	#2
davidgem1406 Heptode Join Date: Feb 2011 Location: Sheerness, Kent, UK. Posts: 936	Re: Tektronix 2235 - What have I done wrong ? Sounds like you moved the timebase speed to a very slow sweep time.

5th Jul 2013, 3:38 pm	#3
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Tektronix 2235 - What have I done wrong ? And possibly turned off automatic triggering. __________________ Regards, Richard, BVWS member

5th Jul 2013, 3:58 pm	#4
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Re: Tektronix 2235 - What have I done wrong ? Thank guys now working correctly again - you live and learn Alan

5th Jul 2013, 3:58 pm	#5
Vicboduk Hexode Join Date: Aug 2007 Location: S.W. London, UK. Posts: 416	Re: Tektronix 2235 - What have I done wrong ? Hi Alan, here is a link to the manual for this scope. Page 29 shows the settings required to give a base line trace. The most common trap for the uninitiated is the trigger controls. When in doubt make sure that it is in the 'Auto' position, this should make sure that something is displayed. Vic p.s. Richard beat me to it! Last edited by Vicboduk; 5th Jul 2013 at 4:06 pm.

5th Jul 2013, 4:04 pm	#6
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Re: Tektronix 2235 - What have I done wrong ? Thanks Vic I'll print it off before I do any more fiddling Alan

5th Jul 2013, 4:29 pm	#7
Vicboduk Hexode Join Date: Aug 2007 Location: S.W. London, UK. Posts: 416	Re: Tektronix 2235 - What have I done wrong ? Moderators, could you please delete this. Somehow a duplicate second post appeared! Vic

5th Jul 2013, 5:44 pm	#8
Andrewausfa Octode Join Date: Dec 2010 Location: St Ives, Cambridgeshire, UK. Posts: 1,180	Re: Tektronix 2235 - What have I done wrong ? Alan, Have a look at some of the videos made by Alan Wolke on Youtube. In particular, his scope basics videos are ideal if you're wanting to learn which switch does what on your new scope. http://www.youtube.com/user/w2aew You can go direct to his 'Basics and Tutorials on Scopes' videos here http://www.youtube.com/playlist?list=PL746BF38BC2E068E0 Andrew __________________ Invisible airwaves crackle with life. Or they should do. BVWS Member