Tek 2230

Mar 10, 2008 4 Replies
T

Hi, I've been reading this group for some while now and there seems to be some good advice given in amongst the bogus posts, spam and flame wars.



Anyway, I have plenty of xp repairing scopes but I just got 2 Tek 2230's in with the same problem, so I'm wondering if its just me or something I missed previously.



On slow timebase setting say 2mS with readout on but not storage, I'm getting interference on the trace, like the alphanumeric data is strobing the trace. On faster timebase speeds no problem. I was wondering if anyone out there has a 2230 they could take a look at and see if this is just a design fault, its odd to get 2 of a kind, in fact I was thinking its me being daft, and went around turning off the flourescents in the workshop in case it was just interference strobing, but no joy. Power rails are all clean. Incoming mains is clean. Nothing else electrically noisy in the workshop.



So if you have a 2230, put it to single trace, (or dual on Alt), around



2mS timebase, readout on, and tell me do you get interference on the trace? Like unsynchronised dark spots running through.

Email address is bogus so please reply through the group.



Thanks in advance. JC


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J

Tchotky wrote in news:zljBj.12683$ snipped-for-privacy@fe04.news.easynews.com:

the "dark spots" are the readout characters being written.

Jim Yanik jyanik at kua.net
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T

But should there be this interference with the trace? Its quite noticeable and would annoy me if I had to use one of these. I suspected a fault in the blanking circuitry but can't see anything out of spec which is why I was hoping someone would confirm if this is usual or a fault. On Philips analog scopes with on screen readout no such effect is visible, I would have thought Tektronix would be of comparable quality. I've noticed this on a 4 channel 2245 since,even more noticeable with 4 traces, its starting to bug me. Thanks for your reply anyway. JC

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J

Tchotky wrote in news:szwBj.439192$ snipped-for-privacy@fe03.news.easynews.com:

the RO gets written the same time the trace is scanning across the screen. The RO circuits interrupt and deflect the beam to where the RO is written. At some sweep speeds,it becomes noticeable. It may even be a holdoff setting that makes it 'worse'. That's why you can turn off the RO.

I don't know how Philips does their on-screen readout.

Jim Yanik jyanik at kua.net
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T

well, guess you are correct, I just got a 2246 in and its the same, beats me how I didn't notice this before. I suppose I don't use the slower timebase speeds during calibration much. I'll have to take a closer look at a Philips next time I get hold of one, maybe it does have the same problem but I've used them a lot in the past and not noticed anything. Cheers Jim, JC

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