which oscilloscope should buy?

[space2000]

hi,

which oscilloscope should be good for amp? i need a simple and easy to use oscilloscope. how much does it cost for used oscilloscope?where should i look for?

 

[Jan Dupont]

Thats very difficult for us here to answer.....
Have you settle on what you need ????
20 or 50 or 100 MHz Scope ?
Hameg and Tektronix make scopes in all ranges

 

[Ragnwald]

Hi Space2000

http://www.diyaudio.com/forums/showthread.php?s=&threadid=126259&highlight="oscilloscope"

Nice thread.

 

[lineup]

audioband is 20.000 Hertz
2 MHz is 100 x Audioband

If you have an Analog Dual Channel 2 MHz Scope,
you have a very useful tool for normal audio.
Will do 98% of what any fancy UHF oscilloscope will do for you.
Like somebody said, only 1-2 % of anything interesting will be in VHF / UHF band.

I got my old VERY heavy All Tube English Oscilloscope (London Made)
for free by a kind man here in town.
He had no use for it. Was only an object put in attic of his house.

I had a lot of hardship carry This HEAVY Scope to nearest busstop
and then get it from my busstop into my house.

But here I have it.
All tubes ( many EF86 for input amplifier ) working still.

 

[sbrads]

If you want a good simple to use digital scope try a Tektronix TDS210. I use them all the time at work fault finding and testing military switch mode PSUs, they are so dependable with reliable triggering, small/light, 60MHz. I wouldn't use any other for fault finding as I've had to struggle with quite a few more expensive ones that take forever to do the basics and don't trigger as well.

 

[aandy]

best to get an old crt analoge scope,
like the hameg,digital scopes are not very good for amplifiers unless it is a very good one like 100mhz

 

[wrenchone]

A really good analog scope will cost a whole lot less than an adequate digital scope, and will tell you less lies, as you only have to worry about bandwidth rather than possible aliasing artifacts. Digital scopes are really nice when you need to document your work, but you can do the same with an analog scope, a digital camera, and an improvised hood.

 

[audiotony]

I have an old Velleman PC scope that I built from their kit about 15 years ago and it still works great. I think you can buy a cheap PC scope, learn to operate it and see if a more expensive scope is required for your needs.
The nice feature with the PC scope is the "FFT" spectrum analyser function that they have as well.
By keeping the sampling rate of the scope at least twice as high as the measured frequency, you can pretty much negate any aliasing.

Robert

 

[bear]

ebay?

any vintage solid state Tektronix, Phillips, HP or similar high quality scope that still works properly is a best buy, imho... here in the USA they are rather easy to find for <$100... most of them are 100mHz or better class, and quite good enough for most things.

_-_-bear

 

[AndrewT]

By keeping the sampling rate of the scope at least twice as high as the measured frequency, you can pretty much negate any aliasing.

the old rule was sampling rate ~10times the required frequency for the digital scopes. ie. 500Msamples for a 50MHz digital scope.
But I'm told the software is much better now. But how do you find out before you buy?

 

[audiotony]

Check the manufacturers website and see if there is a manual on their website you can download for the specific scope you want.
If you are lucky there will be a chart which gives you the real sampling rate of the scope for the chosen TIME/DIV setting chosen during measurements.
If not I you would have to ask the manufacturer.

Robert