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Subject: Re: Which one is better -> Agilent 54855A vs Tek 6604 oscilloscope(BW 6Ghz)

Date: 07/15/03 at 7:12 PM
Posted by: Ray
E-mail: rrogers@plaidheron.com
Message Posted:

In Reply to: Which one is better -> Agilent 54855A vs Tek 6604 oscilloscope(BW 6Ghz) posted by Huang on 07/15/03 at 7:09 AM:

Hi,
I bought the lower level of the Tek scope last year; not that it was the best, I had to accomidate the programers and digital people who were more comfortable with the MS background OS.
I thought the (lower bandwidth) Tek and Agilent were pretty equivalent.
If I were you I would check out:
http://www.lecroy.com
There was a comparison article, which Agilent declined, in the Feb 6 2003 issue of EDN.
At the time I looked I thought that the Lecroy was better technically, but at that time they didn't have a windows background OS; now they do.
At this price range make sure you have list of requirements. In normal circumstances, dealing with people who were more skilled in analog electronics, I would have checked the ground bounce effect. That is tie the probe tip to probe ground and then touch a signal generator that is supplying a couple of volts bounce with respect to third wire ground. It's a techy thing but for Analog power systems required. I do such simple minded things now that it really doesn't matter.
For critical timing, choose the tighest setup/hold time and then investigate how well the scope & probe delay times are compensated. I other words can you get good definition for edges requiring 500ps margins; etc.....
Make them give you loaners for a couple of weeks and really try to use them. They might give you some delays but remind them that they have competition.
One of the best things about Lecroy is that the salesperson actually knew how to use the scope, and demonstarted answers to all of my questions.

Ray


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