TDS-1002b Any good? Comments?

I currently have the "pleasure" to work with similar (but older) scopes at a client. TDS220, one of the big TDSes, etc. Long story short I am not too enthused. The 220 even spits out noise that bothers us so has to be turned off at times. The bandwidth gets reduced at the lower input ranges. I've asked them to acquire a used 2465 and that's what I am now using most of the time. Worked great 20 years ago, still works great ;-)

Go for color. It's absolutely worth it. TDS2002 or 2012 are very nice. My personal scope is a TDS2012 and it does 95% of what I need done. It's the size of a shoe box, and you can lift it with one finger.

Once you play with a color digital scope for a while, an old analog scope will feel primitive. The variable persistance, single-shot capture, cursors, signal averaging, math, FFT spectrum analysis, and frequency measurement are great. The screen photographs great with a digital camera, too.

Agilent has a (chinese-rebranded) color scope for $999, I think, and it looks OK. Anybody got comments?

John

AFAIR Spehro had checked out Atten's stuff. A lot of times the innards are very similar among several brand names except that the Chinese originals often come with those bonbon colored buttons.

I still prefer analog scopes. For noise and stuff nothing beats them. Then only downside are the regular requests to turn the lights off which doesn't exactly make me very popular at clients. But we find stuff where digital scopes don't stand a chance. The other downside is that you almost have to resort to EBay to obtain a really good scope because they don't make them no more.

My favorite here in the lab: Ye olde 7000 series mainframe. It's like driving a tank. Love it. Documenting stuff is another matter. The digital camera results don't look too professional and the old Polaroid method might not be environmentally sensitive enough these days. Plus I always found that messy.

That is the Agilent 3000 series, and Rigol are the designer and manufacturer, you can (usually) get the exact same scope a bit cheaper from Rigol, and other makers rebadged.

I've got one of the Rigol's and it's pretty good for the price, it can hold it's own in the entry level DSO market. I like the mask triggering options and digital filtering. Sadly it cannot dump the screen to USB memory stick, that must be done on the PC via the software. Response time is on par with the other entry level scopes.

Basicaly all the entry level DSO's are the same, Tek, Agilent, Rigol, Goodwill et.al only a few features and a few $$$ seperate them, the choice is amazing.

One thing with DSO's is the memory depth, that should be your #1 requirement, you will never regret going for the scope with the deepest memory.

However, recently there have been a couple of entry level mixed signal DSO come onto the market like the Rigol 1000 series:

I have two mixed signal Agilents (6000 series, 54600 series) and I will never go back, mixed signal scopes are fantastic, especially if you are thinking about getting a logic analyser anyway. Certainly worth shelling out a few $$$ more for. In 10 years time every DSO on the market will have mixed signal capability.

Although one can also ague there are plenty of cheap and excellent PC based logic analysers on the market today, so its not needed in a scope.

Dave :)

There is a big divide in "response time" between the low end DSO's and the proper "analog replacement" high end DSO's, but if that's all you can afford, you get used to it. The features available on todays entry levels DSO's are fantastic, and you won't go back. Just the simple ability to be able to single shot capture a waveform you will find invaluable, and wonder how you ever got along without it. BUT you will still need a nice analog scope in addition, so it's worth upgrading there too, plenty on eBay at good prices.

My Tek TDS-210 has been going for almost a decade now, so they can last that long.

Dave :)

I still love my trusty, 20+ year old Tek 2235 dual trace 100MHz CRO. The only problem I've ever had with it was bad focus, due to degraded carbon comp resistors in the focus chain. Replacing them with modern metal film parts brought it back to normal.

Oh man, here we go. ;-) The cheapest color one is $250 more (25%). I know I'd really like the color better, but I was hoping that the PC interface might provide that for free. I now see that Tek has a 10 year/lifetime warranty, so spending the extra cash now wouldn't seem so bad in the long run. After all it's only another $2/month when taken over time. ;-) I fall into the "for a few dollars more" trap every time. It's not like I have money to throw around, but I learned a long time ago that cheap tools cost you allot more in the long run.

That's a pretty good sell. :-) I like the USB interfaces allot. Thanks for your input, I appreciate it. :-)

Hmm, that sounds interesting if it's good.

Ok, I just had a look on eBay, and you won't believe what you can get a new no-name asian DSO for these days:

Anyone know where else you can buy these? They also go under the "Lilliput" name.

Probably complete garbage, but would be interesting to see what you get for the price.

Dave :)

Dinasaur! I find that digital scopes are a lot more likely to find infrequent events, and *save* then for you. Then you set the cursors, walk down the hall, get your digital camera, and snap the I-told-you-so masterpiece.

I sometimes use a 7000-series for tricky stuff. The 7A22 plugin (differential, switchable bandwidth down to 100 Hz, 10 uV/cm) is magical for low-level stuff. And the 7104 (1 GHz, microchannel plate) can be handy. But for most stuff, a color DSO is light-years ahead of some old analog beast.

And I get confused when all the traces are green.

Last week, we saw a bunch of "wideband" noise on a power rail. So we hit the FFT button, and, lo, we see a big frequency line every 200 KHz, all in the neighborhood of 100 MHz. Try that on an analog scope!

John

Do you mean like down the probe cable, out the probe tip and into your circuit, or do you mean accoustical noise?

That just can't be right. Even the Chinese can't make them that cheap, can they?

Somebody bought it, I wonder if they'll admit it? ;-)

I recon it's Joerg!

I don't know what price the Rigol goes for in the US, but here in Oz it's AU$995 for the base model 60MHz Mono unit. That's about US$750. I was about to say that was cheap, but I just checked the TDS1002 and that can be had for US$750 too!:

Dave :)

"Anthony Fremont" wrote in news: snipped-for-privacy@news.supernews.com:

radiated electrical noise,from the switcher supply.

BTW, *NO* TDS series scopes come with component level schematics or parts lists,and are repaired by module-exchange only,until its dropped from "long-term product support"(LTPS),then you can't get ANY service except for calibration.

TEK wants then serviced only at TEK.

Lionel wrote in news: snipped-for-privacy@4ax.com:

actually,the 0.5w carbon FILM resistors were the ones failing,and the real,authentic TEK mod was to replace with carbon COMP parts.

"Anthony Fremont" wrote in news: snipped-for-privacy@news.supernews.com:

better read that TEK warranty CAREFULLY.

Beg your pardon, Jim, my mistake.

(For those who don't read the repair NG, Jim is one of the people who kindly helped me with the above repair. :)

PS: The 1/2W metal film resistors I used for the repair are still working fine so far, which may be of interest to anyone with a similar problem.

Nope, it look like EMI from a switcher or something like that in there. It was pretty loud and messing up some analog circuitry on a breadboard. The good old Tektronix 2465 did not do that at all.

With a 10 year (minimum) warranty, is that really an issue? Or am I seriously overestimating the value of the warranty?

It's the LCD screen, the TDS series scopes are famous for this. Put the probe near the screen and you'll see it.

Dave :)