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Old 19th November 2006, 07:36 AM   #1
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Default 'Scope - is it worth buying?

i"m looking at getting a basic ocilloscope and have seen a few things in my price range around. current options are:

Kikusui COS5020 (20Mhz)
"HP 181A Oscilloscope, Storage, c/w HP 1801A, 50 Mhz Vert & HP 1821A 50 Mhz Horiz P/Ins, Status unknown"
Iwatsu DS-6121A (100mhz)

are any of these thinking seriously about for a first scope on a budget. Tek 465's (which seem to be a diyaudio.com fav) are a bit more $$ than I want to spend when they do turn up.


cheers
Paul
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Old 19th November 2006, 10:21 AM   #2
gerhard is offline gerhard  Germany
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I have bought a new Iwatsu SS-5712, 4 CH, 200 MHz abt 20 years ago which is still OK.
Only fault during this time was a TO-5 transistor in the X-deflection which was easy to fix
because all circuit diagrams are in the user manual.
Other than switches and the tube no exotic parts. Very bright.
It was a good buy.

Gerhard
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Old 20th November 2006, 10:29 PM   #3
jarthel is offline jarthel  Australia
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i think a scope is worth buying if you're going to use it regularly. if you're going to DIY once every few years, I think it's not worth it.
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Old 7th June 2007, 09:58 PM   #4
SUE is offline SUE  United States
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Default iwatsu ss 5712

I also have a iwatsu scope and I like it very much.I don't have an operators manual but I am trying to figure it out.
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Old 7th June 2007, 10:31 PM   #5
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A scope is an "enabling" technology. That means that once you have one, you find all sorts of uses for it that you didn't think of before you got a scope. This is especially true if it is a decent scope. 100 MHz BW is definitely decent and useful for many things.

Avoid "audio bandwidth" scopes. They are nearly useless because very little that is interesting happens at audio speeds/frequencies. On the other hand, if you want it for a prop that shows wiggly lines on the screen that bounce to the music, they are really great.

Make sure you get probes that match or exceed the BW of the scope. Switchable 10x probes are really useful. Be sure they are trimmable and the capacitance range matches the scope input capacitance, often marked on the front panel of the scope. Tektronix's web site has at least one good app note explaining how to choose scope probes. I suggest you read it before buying probes.

I_F
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Old 7th June 2007, 11:36 PM   #6
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I bought my Iwatsu close to 30 years ago, and it still works. Nothing fancy, though, just 2 ch and 15 MHz.
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Old 8th June 2007, 12:43 AM   #7
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A good working Tektronixs can be had pretty reasonable off of ebay..
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Old 8th June 2007, 01:27 AM   #8
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The statement about TEK pricing is true only if you add the caveat "in the USA".
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Old 8th June 2007, 02:05 AM   #9
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Hadn't given that any thought.And shipping to aussie would be outrageous.Guess your just going to have to move ...LOL
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Old 8th June 2007, 03:39 AM   #10
john65b is offline john65b  United States
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I bought a Textronix 5110 off ebay a year or so ago for $40 with the hopes of using it on some amps - basic stuff...

I work with a group of older electrical engineers and technicians and none of them could show me how to use it...so its been sitting in my closet the whole time...

Anyone have a tutorial site they can refer me to? I have been able to do without, but wouldn't mind learning how to use it..

Also have a PC based Oscilloscope program some where too...
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