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Old 10th April 2007, 03:13 PM   #1
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Default This a good beginner 'scope?

http://boston.craigslist.org/sob/ele/307672005.html

Leader LBO-511: one channel, no probes, $25, said to be in working condition. Looks like a 100Khz bandwidth? As you can see my knowledge is limited. It'd involve a nice 2-3 hour drive from Boston to Cape Cod and back so I don't want to bother unless it's usable for more than a $25 doorstop.

I am mostly interested in amp/preamp work at this point and not so much the digital stuff. I realize that I could get more for $100, $200, $400 etc. but if I can get an OK scope for the price of two martinis and save the rest for parts to build more stuff to test I'd rather do that.
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Old 10th April 2007, 03:19 PM   #2
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it's not $25 with the gas money and time involved. don't be cheap when it comes to a scope but there's nothing wrong with a good deal either. and maybe consider a 2 channel scope at least, although 1 will still be good for a lot.
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Old 10th April 2007, 03:39 PM   #3
SY is offline SY  United States
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Don't cheap on important tools. Two channel, triggered and delayed sweep, at least 40MHz (100 is better), top tier maker. Yes, that will be closer to $150-250 than to $25, but you wouldn't work on your car with Bob The Builder plastic wrenches, would you?
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Old 10th April 2007, 04:10 PM   #4
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OK then, guy just told me he has someone driving down from even farther away than me (Cow Hampshire! 3 hours easy) to pick it up. But he also has this rig to sell for $200:

http://boston.craigslist.org/sob/ele/307634085.html

My concern is this thing would be serious overkill for a newb like me, and perhaps that if one part of it breaks, the whole thing is shot and I'm out $200.

-- Agilent / Hewlett Packard / 16500A Logic analyzer mainframe:
Consisting of 2 built-in 3.5 inch floppy disk drive, built-in RS-232 and GP-IB interfaces, Color touch screen.

-- (One) 16530A Timebase plug-in card:
This card is designed for use with the 16531A oscilloscope card and provides an Oscilloscope-on-a-Card capability.

-- (Two) 16531A 400MSa/S Oscilloscope cards:
This card is designed for use with the 16530A timebase card and provide an Oscilloscope-on-a-Card capability. Bandwidth of 100 MHz and sample rate of 400 MSa/s. Has 2 channels per card (for a total of 4 channels with 2 cards).

-- (Three) 10433A Probes

-- System Driver Disks

-- HP Thinkjet 2225A with GP-IB cable
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Old 10th April 2007, 04:24 PM   #5
SY is offline SY  United States
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For $200, stick to a good quality analog scope with a name like "Tektronix" on it. It will be the best money you've ever spent on this hobby.
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Old 10th April 2007, 04:25 PM   #6
kscharf is offline kscharf  United States
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This is NOT a good scope for digital work. It would be fine for audio work. In it's day it was considered a tv scope, but would not be useful for today's digital HDTV etc.

You know, you can pick up an older used Tek on ebay for $100 or so.
I have an old Tek 453 scope that is STILL useful for digital work that I got for about $200-$300 years ago.
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Old 10th April 2007, 06:22 PM   #7
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Tek 2215 show up on eBay regularly for < $100, 60MHz with delayed trigger, a budget analog scope from the early 80s, works fine for me.

HP 1220/1222 may be available for less, 15MHz, calibrated sweep but no delayed trigger. OK for audio frequency but may miss HF parasitic oscillation problems.

The Leader is certainly better than no scope at all.
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Old 10th April 2007, 06:57 PM   #8
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Well, the cheapo Leader was gone before I got to it so that choice is moot.

I live in Boston and see the next MIT flea market is this coming Sunday so I think I am going to hit that first, have to imagine there will be at least a few things to see there in or near my price range. Besides, part of the reason I love living in Boston is being able to say, "I'm going to the MIT flea market this weekend to look for an oscilloscope."

In case anyone is looking for it: http://www.mitflea.com/

I hate the idea of paying $40 for a scope on eBay and then paying $50 to ship it.
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Old 10th April 2007, 07:18 PM   #9
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by sansbury
I hate the idea of paying $40 for a scope on eBay and then paying $50 to ship it.
Well, there you have it, why waste money shipping a cheapo. Go for an analogue 'scope with "Tektronix" written on it. At least 60MHz, and preferably 100MHz. Definitely two channels, and it's nice to have delayed timebase (but not essential). As SY says, saving money on an oscilloscope is wasted money. Think about it; you're going to make measurements, and on the basis of those measurements you'll spend some money or rebuild something you already spent money on. Now, how much would it cost if your test equipment made you make the wrong choices?

I use a Tek 2213 60MHz analogue 'scope and a Tek TDS3032 300MHz digital 'scope. Stay away from digital 'scopes until you know far more.
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Old 10th April 2007, 11:03 PM   #10
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Quote:
Originally posted by SY
but you wouldn't work on your car with Bob The Builder plastic wrenches, would you?
Sy,

I think that is what many allegedly professional auto repair shops here in Ontario must use based on the cost and quality of the repairs we see. Aren`t Snap Off wrenches, a competing brand, also all made of plastic?



I agree that it is a worthwile investment to get a high quality, all analog two channel o-scope with delayed TB and 100 MHz BW. They are not expensive bought surplus. The idea of a radio parts fleamarket held at MIT sounds like a lot of fun! We Canadians get nothing like that up here. Our military electronics surplus doesn`t get written off by the government until it is at least 100 years old and then it comes with ALL the capacitors removed making it worthless junk because they put totally untrained doofuses in charge of making the stuff PCB free. Guys that wouldn`t know it if a real PC Bee bit them in the a$$.
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