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Tektronix DPO2002B

sci.electronics.design Tektronix DPO2002B scope

Has anyone here used a Tektronix DPO2002B scope or one of that family? The intended setup on the scope would be a horizontal sweep rate of 1 millisec per graticle/division with the objective of recording 2 channels for about 5, 6 or

7 seconds. With the DPO2002B's claimed memory of 1 million points, 6 seconds of recording would require a sampling rate of 166 samples per graticle (166666 per second), which is much more than adequate. Unfortunantly the manual gives no information regarding sample rates and merely states the scope "use real-time sampling" and doesn't mention if it also uses or doesn't use sequential sampling. This lack of clarity regarding sample rates and sampling methods makes determining the scope's ability to handle the intended testing impossible. So I'm hoping someone here has had some experience with Tek's DPO2000 series and could render an opinion.

Hul

Reply to
Hul Tytus
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My bench scope is a DPO2024, and it's pretty awful. It's supposed to be 200 MHz, but it's really about 180. The Linux OS takes forever to come up. It misses knob detents randomly. AC-coupled triggering works wrong. Force Trigger does absolutely nothing. The menus are really annoying.

Why don't you do a single-shot acquisition at 1 ms/div and then zoom the display? You'll see the individual samples.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics
Reply to
John Larkin

John - thanks for the warning about the Tek scope. Jamie suggested useing a slow sweep with the Rigol scope, as you did, and then "expanding" it and that looks good.

Hul

John Lark> > >sci.electronics.design

Reply to
Hul Tytus

Have you checked to see if there are firmware updates for it? Latest is version 1.56.

This one may fix the problem you are seeing with the knobs: V 1.29 05/07/2010 Defects Fixed:

- Enhanced encoder performance for front panel knobs. Improves linearity and smoothness of knob operation.

Reply to
JW

"Enhanced performance" is newspeak for "not as idiotically broken as it was."

How do you define linearity for a detented encoder? Or smoothness?

How could Tek ship obviously broken crap?

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics
Reply to
John Larkin

Not missing knob detents randomly would improve both the smoothness and the linearity.

Designers don't have to use the product? Ship now, fix it with a firmware flash later?

--sp

--
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Spehro Pefhany 
Amazon link for AoE 3rd Edition:            http://tinyurl.com/ntrpwu8 
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Reply to
Spehro Pefhany

It's the low-end market. "Our customers are our Beta testers."

Judging from some of the complaints in the EEVblog forums, some of the Chinese scope manufacturers are even worse.

Anyway, there's been a lot of fixes on the firmware of that series, if it were mine I'd give it a try.

Reply to
JW

The Rigols seem fine. More bandwidth than specified, as opposed to Tek who ship less. Fast startup, nice user interfaces, no obvious bugs. At a fraction of the price of the Tek.

We have one 4-channel 1 GHz Rigol, which cost about $9K, and it's excellent. They are not just low-end any more.

Last time I contacted them about the big three bugs, they basically told me to drop dead.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics
Reply to
John Larkin

Yeah, I once had a field rep tell me "we don't see any complaints about X" and I pointed out that I'd personally complained to their website for months. "OH", he said, "that all goes to another department". Sales or PR, presumably.

Reply to
whit3rd

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