How to use and what to measure with the Oscilloscope - brian donegan Options  Watch this topic  Print this topic  Atom Feed  RSS Feed View » Normal Threaded

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Jordo		#1 Posted : Wednesday, November 4, 2015 4:38:09 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		So Iv'e got myself a second hand scope. It's a huge device out of the eighties I guess, but I think it works. It gives a green line anyway. But it came without cables. They're not too expensive I have seen, around 30,- euro's and they come in different types. Do I have to look for any specifics? I want to check the PSU's and data signals if possible... Thank in advance! Jordo Jordo attached the following image(s): Knipsel.PNG (145kb) downloaded 4 time(s). Knipsel2.PNG (198kb) downloaded 4 time(s). You cannot view/download attachments. Try to login or register.
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avr300		#2 Posted : Wednesday, November 4, 2015 6:15:00 PM(UTC)
Rank: Member Groups: Member Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)		Regarding the probes - start by telling us the make and model. And what's the bandwidth of the scope?
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Jordo		#3 Posted : Wednesday, November 4, 2015 6:57:35 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Yes, good question. It's a Tektronix 5111 "Bandwidth: DC- 2 Mhz Channels: 2 The 5111 Storage Oscilloscope is a single-beam storage oscilloscope; bi-stable, split-screen display. Stored writing speed is 20 div/ms in normal mode. Storage view time is one hour at normal intensity and up to ten hours at reduced intensity. Requires 5000-Series plug-ins (sold separately). Bandwidth: 2MHz (Plug-in dependent)" Manual Seems that a 2MHz Scope is quite low..... Edited by user Wednesday, November 4, 2015 9:59:28 PM(UTC)  | Reason: Not specified
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Russ White		#4 Posted : Thursday, November 5, 2015 12:10:14 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		But still it is usable for checking bit clocks, word clocks, etc. :)
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Jordo		#5 Posted : Thursday, November 5, 2015 10:17:43 AM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Ok that's what I wanted to know too! I got concerned when I saw the high numbers of modern scopes. But I guess probes for 15MHz scopes for instance will work on my 2MHz scope? Or do I also have to take other values into account? And does anyone have any examples on how a correct working Placid should look like? Just a flat line? And the different Word, Clock etc? Thank in advance! Jordo Edited by user Thursday, November 5, 2015 10:38:45 AM(UTC)  | Reason: Not specified
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avr300		#6 Posted : Thursday, November 5, 2015 4:32:46 PM(UTC)
Rank: Member Groups: Member Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)		Originally Posted by: Jordo Ok that's what I wanted to know too! I got concerned when I saw the high numbers of modern scopes. But I guess probes for 15MHz scopes for instance will work on my 2MHz scope? Or do I also have to take other values into account? 15M probes will do just fine. There's a lot of fine probes at the "bay". Originally Posted by: Jordo And does anyone have any examples on how a correct working Placid should look like? Just a flat line? And the different Word, Clock etc? Thank in advance! Jordo Yes. A Placid should be a flat line. Once I measured it wasn't - resulted in a lot of work ;-) But that was then, this is now.
1 user thanked avr300 for this useful post.		Jordo on 11/7/2015(UTC)
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Jordo		#7 Posted : Thursday, November 5, 2015 7:16:18 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Thx avr300, I have ordered two of these. I think they will arrive this saturday. Let's hope it all looks normal...But on the other hand, the investment could pay off is there seems something to improve :) (and than hope it will be solved quickly) Anyone any exampes of how a data signal will look like on the scope? Offcourse data signals are 1 or 0 so a square alternating line I guess. But it should be nice to know what kind of patterns to expect the first time to know what it looks like if it's wrong. Thx, Jordo Edited by user Friday, November 6, 2015 12:21:56 AM(UTC)  | Reason: Not specified
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Jordo		#8 Posted : Monday, November 9, 2015 3:53:23 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Ok, I've go the Scope up and running. First question: Is this what to expect between the Line and Neutral from a wall socket?.... Edited by moderator Monday, November 9, 2015 5:07:52 PM(UTC)  | Reason: Not specified File Attachment(s): Wall Socket.jpg (308kb) downloaded 55 time(s). You cannot view/download attachments. Try to login or register.
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Brian Donegan		#9 Posted : Monday, November 9, 2015 5:08:20 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		You have florescent lights in that room?
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Jordo		#10 Posted : Monday, November 9, 2015 5:27:27 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Hm maybe... Low energy light bulbs... Same picture with all lights off. Edited by user Monday, November 9, 2015 5:33:03 PM(UTC)  | Reason: Not specified
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Jordo		#11 Posted : Monday, November 9, 2015 10:35:04 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Ah That's better I think I had some adjustments to be set right. Let's see what it does tomorrow in the daytime. Could it be such a difference?!! File Attachment(s): Avondstroom.JPG (297kb) downloaded 7 time(s). You cannot view/download attachments. Try to login or register.
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Jordo		#12 Posted : Tuesday, November 10, 2015 9:52:23 AM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Now I want to test my data connections; Bit, Word, Master Clock... Do I just put the probes on the Signal and reference ground with the music on?
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Brian Donegan		#13 Posted : Tuesday, November 10, 2015 7:04:33 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		Yes, but carefully, so as not to short things.
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Jordo		#14 Posted : Tuesday, November 10, 2015 7:41:35 PM(UTC)
Rank: Member Groups: Member Joined: 12/7/2011(UTC) Posts: 474 Location: Amsterdam Thanks: 31 times Was thanked: 4 time(s) in 3 post(s)		Ok, and according to you a 2MHz scope is sufficient? Because I havent picked up any signal up to now...
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