>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 03 April 2006 13:09
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] Oscilloscopes...
>
>
>On Mon, 3 Apr 2006 07:37:17 -0400, you wrote:
>
>>William Chops Westfield wrote:
>>> I *LIKE* my TDS-210,
>>
>>I have one for my use at a customer, so have acquired some experience 
>>with it.  My biggest gripe with it is that the horizontal trigger 
>>position stays fixed in time relative to the center of the 
>screen when 
>>you change time scales.  It does not stay fixed in screen position as 
>>you would want.  This may sound like a minor nit, but when 
>you use the 
>>scope regularly it gets REALLY ANNOYING.  Especially when you expand 
>>the time scale the trigger position is suddenly gone because it got 
>>moved off screen.  If you're not used to this "feature", you start 
>>fumbling thru the menus trying to figure out how you 
>accidentally made 
>>the trigger display go away.  After you're used to it you have to 
>>remember to move the trigger to the center, expand the time scale 
>>slowly, keep moving the trigger back to the center unless you got it 
>>right on center the first time else the error will eventually blow up 
>>and move it off screen, get to the right time scale, then move the 
>>trigger back to where you had it in the first place.  It gets to the 
>>point where you dread changing the time scale so you don't 
>have to mess 
>>around with the trigger.  Either that or leave the trigger in the 
>>center of the screen, but that gets annoying too since that usually 
>>wastes half the screen.
>
>
>It's this sort of niggle that makes evaluating scopes so 
>important to see how well you can live with them. Incidentally 
>the Agilents zoom around the centre (or optionally one div 
>from the left or right side
>- I prefer the left option as most of the time you are 
>interested in what happens after the trigger).

Out Aglient 54622D's work the same as the Tek, i.e. if the time between the trigger point and middle of the screen stays constant, so zomming in moves the trigger position to the left or right unless it's bang on zero to start with.  It is a bit annoying as it can take an impossibly long time to move the trigger back on the screen with the hoizontal postion control if you have zoomed in considerably. Normaly you have to zoom back out, zero the trigger and then zoom back in.  Apart from that one niggle they are superb scopes though, I would love to have one at home.

Regards

Mike

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