Hi All,
First post, (obvious by the counter
). Been hanging around quite awhile , great blog. Love the forum. I have to say for a lightly moderated forum the behaviour on here is (with a few exceptions) first class.
I am an IT nerd by employment, who used to be more involved in electronics in the very dark past. Also off and on Ham radio nut for the last 25 years or so. When life will allow of course.
I decided last year to rekindle the interest in electronics and rebuild the workshop/lab (this blog had a lot to do with that), as I now have the resources to do it and the minister of finance hasn't vetoed anything (yet!). So I decided I needed (would like) a good DSO to go along with the old Tek 2215 I have been using on an off, as its starting to act up and will need some TLC soon. It's old enough that methinks the caps will need replacing sooner than later.
Because I like to buy tools only once if I can, I try to buy quality(within budget limitations). I am considering the Agilent scopes. Though I am realistic enough to think they may be over kill for my immediate needs. I just don't like having to replace or struggle with gear because I went "cheap" (subjective term I know). I am thinking that what I buy now, I am likely to have for some years. I am not one to "upgrade" every year or model release, unless it's not doing the job of course.
What's my intended use you may ask?.
Like most not in the business it is hard to be specific as to its intended use. "Everything" or "don't know" are not particularly useful responses when asked, so I'll try and nail down the possible/probable uses.
- Ham radio for sure.
- Micro-controller based projects. I have some things in mind for my car for a start. Fairly new to me, though I did dabble with Z80s back in the early 80s.
- Learning. It's been so long that I am on a learning curve to refresh the memory. This forum and blog has helped an awful lot there.
Plus others that fall into the "everything" bucket.
Anyway, to the question. I am considering the Agilent 2000 series or the 3000 series. They mostly tick all the boxes for me.
Also,
- I don't need 4 channels as I don't recall ever having a need for more than two so far. So just 2 channels is acceptable.
- I think I'd prefer a separate logic analyser so have ignored that feature(I could add it later, but probably won't)
- From what I have read here it would seem the front-ends are similar/same at least on the lower bandwidth models for the 3000 series.
Where I am struggling a bit, is with the memory depth and waveform update rate. I have read a number documents on the Agilent site regarding features etc. As well as searching here and elsewhere. So believe I have a reasonable understanding of the benefits. Dave's comparison with the Rigol certainly demonstrated how useful a fast update rate can be.
What I don't have is real world experience. I mean the specs look good. But for those that use either these scopes or their ilk. How often would you run into the limitation of say the 100K depth of the 2000, in your day to day work. Or being in the business you would automatically go for the deeper memory just because you can. Or the boss pays for it so I use what they give me sort of thing.
So I thought if I could collect enough data about how often the memory limit was found to be a constraint it might help me decide if I really needed(wanted) the 2MB/4MB of the 3000. I.e, if 10 people used the 2000 but only 2 of those 10 found it a limitation, then it might be very rare that I would find it an issue given my expected usage. I guess it does not even need to be the Agilents at all really. So maybe more generally how often is it a problem. Is memory getting deeper in response to there being an industry need for it. Or is it more a marketing driven feature.
I would like to just get the higher spec 3000 series. But the cost difference is significant enough to make me reconsider. I was originally only considering the 100Mhz in either model. Maybe I'd be better off getting the highest bandwidth 2000 series against the unknown navel gazing possibility of needing the increased memory of the 3000. Also I don't think for me the 50K updates vs 1M is a big deal.
Of course one big plus for the 2000 is it would likely leave more funds for other
toys tools.
Most of the other differences between the 2000 and 3000 I can weigh myself as to value. Mostly it's too many $$ and the minister going "it costs how much!!!". She gave trying to understand my need for these sort of things a long time ago.
Cheers
Rob