Electronics > Beginners

Oscilloscopes to stay away from? (spec: Tek 2337 question)

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rf-loop:

--- Quote from: EEVblog on June 03, 2011, 06:30:08 am ---
--- Quote from: mikeselectricstuff on May 25, 2011, 11:24:33 am ---The 2465A was probably the best general-purpose analogue scope ever made.

--- End quote ---

I'd concur with that. They are still highly sort after on ebay.
Don't forget the 2225 is you are doing low level signal work. The 500uV/div sensitivity is pretty much unmatched by any other scope?
http://republika.pl/rubi/oscyloskopy/tek/t.pdf

Dave.

--- End quote ---

With  Tek2465 (and other 2400 models)  there can use CH1 - CH2 cascading and get 200uV/div
There is CH2 output what give 20mV/div out. (20mV to 1M and 10mV/div to 50ohm.  This can connect to CH1 and get 200uV or 400uV/div. (using 1M or internal 50 ohm impedance impedance )

I have not seen data about cascaded BW/Risetime/noise and I have not measured it.
But B model specs for 2mV/div is 350MHz and  5mV and more, 400MHz

Kennynva:
Well I seen alot of Tek scopes on here..but not ONE mention of my Tek 2431L,,,,,Is this some kind of a weird scope, in between a 2430..?????

edavid:

--- Quote from: Kennynva on January 13, 2017, 04:52:52 am ---Well I seen alot of Tek scopes on here..but not ONE mention of my Tek 2431L,,,,,Is this some kind of a weird scope, in between a 2430..?????

--- End quote ---

You're right, it's not very common.

It was a cost reduced version of the 2432A.

rstofer:
Most of my FPGA projects run at 50 MHz or so.  To see a decent square wave, I need at least 250 MHz to show the 5th harmonic and that's kind of a minimum if you want to see something resembling square.  The 7th and 9th really help but the 9th requires a 450 MHz bandwidth.

i bought a used Tek 485 about 12 years ago for about $200;.  I got lucky and the scope still works well.  I bought a Rigol DS1054Z for the measurement and decode features (plus 4 channels).  But when the image requires bandwidth, the 485 is the scope to use.

If my FPGA projects get up to 100 MHz or higherk I don't have enough bandwidth, even with the 485.

tggzzz:

--- Quote from: Fraser on May 23, 2011, 06:45:12 am ---As a beginners CRO with 20MHz BW you won't go far wrong with one of the following:

--- End quote ---

They won't go right with such a tool. They are only suitable for audio and mechatronics applications. They are useless for digital circuits built using any technology since the mid-70s!

When you have a problem with digital circuits there are three things you need to check:

* signal integrity: are the edges monotonic, are there overshoots/undershoots, is there ground bounce. The period is irrelevant. 100MHz is just about adequate for original TTL; modern TTL requires >=300MHz
* runt pulses: especially near reset inputs and in asynchronous circuits. 100MHz is just about about adequate to spot 5ns runt pulses
* setup/hold violations: a common source of problems. Look at the Tsu and Th spec of any logic family!
And a scope is the wrong tool for RF applications, other than seeing if a signal is present. RF requires sensitivity and linearity; scopes fail both of those.

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