I want to buy an Oscilloscope - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 23rd February 2005, 02:21 AM   #11
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Nah, I bought a 100MHz 6 channel scope (Kikusui), freshly calibrated, delayed sweep, for less than the price of a set of medium-grade speaker cables. It's no Cadillac, it's a Camry.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 23rd February 2005, 02:33 AM   #12
Banned
 
Join Date: Aug 2002
Location: New York, NY
Send a message via AIM to yldouright Send a message via Yahoo to yldouright
Default Is 100MHz with 5V always better than 35MHz with 2mV resolution?

Just one last note that some of you may have missed. In some situations, the resolution 5mV, 2mV etc. can be as important as the frequency. I still need my Tek 442 on occasion even though it has only 35MHz bandwidth.
  Reply With Quote
Old 23rd February 2005, 09:38 AM   #13
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by rcavictim



Yeah sure it is possible to learn how to drive on a Cadillac I guess. Rip around on yer daddy's muddy cornfield with it.

Me thinks a lot of you guys sure are spoiled!
I will readily acknowledged that I have spoiled myself. After paying for 3 undergrad educations I deserve it. What else am I going to do, buy vintage Bordeaux and watch them age?

Our tastes have just changed! I built 3 scopes when I was seriously into ham radio -- a TEK535 would have cost about $700 to $1000 back then -- there are no remnants from the first one which used (if I recall correctly) a 2BP1-11 with vacuum tube amplifiers. The second is pictured here -- now just as a carcase of a navy display -- i wonder if I have all the pieces!

Click the image to open in full size.

The third was from the article published in Radio Electronics in 1980 -- unfortunately this project stalled out because the second kid arrived and I had to take a new job!. Of course I was able to then purchase a TEK535 from Grumman's depot which made testing a lot easier.
Attached Images
File Type: jpg scopes.jpg (65.7 KB, 452 views)
  Reply With Quote
Old 23rd February 2005, 10:33 AM   #14
Jennice is offline Jennice  Denmark
diyAudio Member
 
Join Date: Jun 2003
Location: Planet Earth
Hi Terry,

Just adding my 2 cents here...(own oppinion, use it or forget about it):

I would say that 40-60 MHz is a fine starting point. >>100 MHz isn't useful, unless you have interesting (read: odd) amp designs.
If an amp has problems, you can normally see it way below 50 MHz.

Yes, 2 channels is a must!
For audio analysis, digital storage scopes aren't always better. However, some have built-in FFT (math) functions, which can be very useful.

I agree, you don't need a Cadillac to start out with. Then again, buying the cheapest thing around might be costly in the end, when you find you really need/want features that require a new purchase.

The analog ones are usually physically bigger, but easier to get started with.

An important thing to check (which the cheaper ones don't always have) is independent/insulated inputs, meaning that input ground of channel 1 is not cvonnected to input ground of channel 2. This elliminates ground currents, and prevents accidental short-circuits if the measurement points do not have the same "nagative" potential.


If you need assistance, I'll guide you through a scope function, Terry. Maybe I should extend my guide with this stuff, too?

Jennice
__________________
I get paid to break stuff. My g/f gets paid to play with children. Life is good.
  Reply With Quote
Old 23rd February 2005, 12:34 PM   #15
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
i have the FFT modules on the TEK -- it is "somewhat" useful -- but not as good as a dedicated analyzer -- the most helpful part of the FFT is finding the exact frequency of an oscillating part and its relative magnitude. the more expensive TEK scopes can do network analysis with FFT on the fly -- which means that compensating a power supply error amplifier loop takes less time.

i wouldn't purchase an older digital scope, as one pundit has said "they don't tell the truth all the time".

a differential probe -- there have been good inexpensive designs in Elektor, Electronics World and AudioXpress -- is very worthwhile.
  Reply With Quote
Old 23rd February 2005, 02:45 PM   #16
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
You guys are the best. I should be able to find a scope that will get me going, armed with the advice you all gave. Thanks so much.

I'm sure once I get it, I'll be back asking a bunch of silly questions.

Thanks, mercator for the link. I've printed some of that out and will be reading into it as time allows.

Thanks again,

Blessings, Terry
__________________
X-BoSoZ, B1 Mezmerize, P101, Symasym, KSA 50, Aleph-X, Leach Low TIM, Leach Superamp, Dx MKIII, Super A, Honey Badger, JLH 1969, Gainclone. FetZilla, Peeceebee, VSSA PMI & jkuetemann, SKA GB150, Ovation nx & sx, AX&SX-14, TMG8, Slewmanster w/CFA-XH, Wolverine, Spooky, Symasui, Low TIM hybrid
  Reply With Quote
Old 23rd February 2005, 04:05 PM   #17
diyAudio Member
 
Join Date: Sep 2004
Location: Central California
I agree that you dont need 100MHz to spot RF problems. My 20MHz scope will show them just fine. I cant tell you the frequency of them, but I dont really care. If you can afford 100MHz or better, fine, but dont feel you have to have it.
  Reply With Quote
Old 23rd February 2005, 05:28 PM   #18
tonga is offline tonga  United Kingdom
diyAudio Member
 
Join Date: Feb 2005
Location: Leicester
Hi guys...I've also been looking around at scopes and I've spotted something that caught my eye, its a 400MHz Philips PM 3295A. It looks way over specced but is it any good for the audio hobbyist? I might buy it regardless as it looks so damn cool.

Take a look

tonga
Attached Images
File Type: jpg 4a_3.jpg (66.0 KB, 516 views)
  Reply With Quote
Old 23rd February 2005, 05:31 PM   #19
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Ooooooh, ooooooooh! I want it!
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 23rd February 2005, 05:45 PM   #20
tiroth is offline tiroth  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
If you have the opportunity to buy that monster for some ridiculous price, I /will/ hate you forever.

A scope like that would be great for digital work. My 100MHz setup makes it hard to see some of the faster signals, like individual S/PDIF bits. The one thing that is nice about it though is the 7A22 with 10uV input range.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help with oscilloscope error0 Equipment & Tools 2 6th April 2008 01:22 AM
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 08:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2