LEADER 8060 oscilloscope - Page 1
Forum section: electronics / general

author: franckrem
author_rank: Newbie
timestamp: May 27, 2011, 11:08:44 pm
content: First Hi guy's i'm new to the forum and this blog and realy like it...Now I bought a realy nice fully working analog oscilloscope LEADER 8060 60mhz and i'm trying to find the documentation for it. It seam to be a pretty rare oscolloscope because even on LEADER website or google I dont find any thing...So If anyone as something it would be nice if you could transfer it to me (or any hint where I could find something)And also the trace of the two input are a bit crooked you can see it on the third photo, is there a way to ajust that?thanks guy's and gal's

author: rf-loop
author_rank: Super Contributor
timestamp: May 28, 2011, 06:04:55 am
content: Adjustment is under focus knob (deep inside hole). If can not adjust you need open scope and "repair" or repair but first use this adjustment.

author: david77
author_rank: Frequent Contributor
timestamp: May 28, 2011, 06:11:26 am
content: Yes, try the "Trace Rotation" adjustment.

author: franckrem
author_rank: Newbie
timestamp: May 28, 2011, 06:14:48 am
content: thanks guy's that was an easy fixbut it look's like there is a problem with the horizontal control board because (as you can see on the first photo) on a sqare wave signal the top and bothom line overlap and wen I put a sinus signal it gives me a big thick line...I opend it up to see and this scope asalready been repaired once and two resistor have been changeon the horizontal controle board ....mabey not repaired they just have been heating the board for a couple of yearsI took some photo so you guy's can seeI would realy like to have the repair manual.Probably it just need an adjustment.I'm wondering if this scope is the same (on the inside) as an other brand of scope (tektronic,hitachi....)

author: david77
author_rank: Frequent Contributor
timestamp: May 28, 2011, 07:47:02 am
content: Have you tried contacting the manufacturer? They may not have the manual on their site but they probably have it archived somewhere. Some manufacturers do actually care about their customers and will happily help you - some however can't be arsed.

author: vk6zgo
author_rank: Super Contributor
timestamp: May 28, 2011, 09:02:36 am
content: Looks like a nice Oscilloscope.I notice from your photos that it has a very useful feature:-The output of vert CH1 is available at the rear.This means you canuse the 'scope as an adjustable gain buffer/preamp for such instruments as Frequency counters,etc.Many equipment manuals say to adjust the frequency at a particular test point,but the low input Z & sensitivity of Frequency counters make this extremely difficult.Using the facility referred to above makes these adjustments much easier.Does it have a delayed timebase?VK6ZGO

author: tekfan
author_rank: Frequent Contributor
timestamp: May 28, 2011, 11:25:55 am
content: That's a pretty nice scope. Can you show us a front panel picture of it. There really aren't many pictures of this model. The operation manual can be substituted with a similar Tektronix scope but the service manual can't.The horizontal control board looks OK. I've often seen this board material get discoloured at even the slightest presence of heat.The problem might be with the Z axis amplifier. This blanks the spot on the CRT when it's going right to left and unblanks it and lets the spot draw the waveform when going left to right. You really can't see much with a square wave in this case. Try using a sine wave at about 1KHz.If the Z axis amplifier doesn't blank the spot on the retrace cycle you should see something like this:try just one channel (here both are turned on)Also try to adjust the focus and astigmatism control (the same knob as the intensity one just pulled out). You might get a sharper picture. Also try to adjust the trigger control (the one labeled pull slope - level) to the point where you get the most stable display.

author: franckrem
author_rank: Newbie
timestamp: May 28, 2011, 07:21:26 pm
content: nice thanks guy's for your come back.tekfan you where right the astigmatism control and focus was the problem (I dident know you had to pull it to make it work)it was all the way to the end of the adjustment!So now the squares are really square...I took a picture of the control panel also for the guy's that where asking.the only thing I need now is an other probe. do you guy's have any suggestion for a not to expensive 60 or 100mhz probe?thanks again

author: Bored@Work
author_rank: Super Contributor
timestamp: May 28, 2011, 08:25:08 pm
content: Quote from: franckrem on May 28, 2011, 07:21:26 pmhttps://www.eevblog.com/forum/index.php?topic=3490.0

author: vk6zgo
author_rank: Super Contributor
timestamp: May 29, 2011, 05:24:35 am
content: Yep, you do have a delayed timebase,& holdoff as well ---nice!VK6ZGO

author: johnboxall
author_rank: Unknown
timestamp: May 29, 2011, 05:33:01 am
content: Here's a link to the 8050 manual - it will be a little different, but at least should give you an idea about operation in general:http://www.tequipment.net/pdf/Leader/LS8050_manual.pdf

author: tekfan
author_rank: Frequent Contributor
timestamp: May 29, 2011, 11:45:12 am
content: I just noticed the scope's trigger input can be displayed as a third channel.Doesn't have an attenuator but still very useful when you need more than 2 channels.

author: franckrem
author_rank: Newbie
timestamp: May 29, 2011, 04:47:14 pm
content: yes really its a pretty nice scope can you belive I got this for 70$I'm pretty happy with itthanks again guy's for your help setting it up