Electronics > Beginners
Need help choosing to buy an oscilloscope
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Roka:
Well I was really happy when i got it but it turned out that it has an intermittent fault on the screen where it doesnt use up the whole width of the crt, plus really loud coil noise from the high voltage part. oh yeah and wobbly and loose potmeter for the trigger and the timed delay stuff. So i will try to get them to exchange for me for a different one. i probably end up choosing the tektronix 2201 even tho its lower in bandwidth as its only 20MHz but it has storage facility. Altough Im not sure just yet, I might up getting the Hitachi or the Iso-tech after all.
Thoughts?

james_s:
That looks like what happens when one of the wires falls off the deflection connection on the CRT. If it were me I'd open the thing up and try to fix it, any cheap used instrument is likely to have *something* wrong and overall this looks pretty good. It's worth at least checking the deflection connections, the whine is likely due to the power supply needing some new capacitors, this is also fairly common.
Mr. Scram:

--- Quote from: james_s on April 11, 2018, 07:57:17 pm ---That looks like what happens when one of the wires falls off the deflection connection on the CRT. If it were me I'd open the thing up and try to fix it, any cheap used instrument is likely to have *something* wrong and overall this looks pretty good. It's worth at least checking the deflection connections, the whine is likely due to the power supply needing some new capacitors, this is also fairly common.

--- End quote ---
I was thinking the same. If the screen works, but has a problem displaying one area there's a good chance it's one or more of the coils. Just make sure not to poke around while it's powered, unless you are very sure what you're doing.
Distelzombie:
How much are you paying for them? I was observing the used-market for month and Tektronix doesn't seem worth it unless you are a collector. Also, you are paying about 150$ in the end (Calibration, repair, probes...) for hardware that is 20 to 30 years old and is already failing. Double that and you can get a new Siglent with 200MHz that will probably work for your own next 20 years. Buy that Siglent with "installment payment" or whatever it is called where you live, and you don't even need to worry about spending more than 30$ per month.
I said I was observing the used market, there's seriously nothing that beat buying new, unless someone gifts you one. It appears the reason yours are dirt cheap is because they don't work. That was a good option 6 or 7 years ago when new scopes cost about 1000$, but now there's just no justification for some non-collector, I think.
Roka:
This was 30 pounds in the uk, however the other tektronix2201 is only 10 pounds because apparently something is wrong with it. I wouldnt mind fixing the thing I am just not quite sure If I can get parts for it, like the pots? or maybe other stuff. I actually open it up and tried to look for the contact fault, however just moving wires around didnt seem to change anything. I didnt have time to look int othe schematics just yet. I also have no chance of getting a high voltage probe to test all parts of the crt. So since I only got the thing today I thought it would be easier to swap it to something that works or have less problems.
probes were 10pounds
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