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Barry Harvey

I Like 'Scopes

Barry Harvey
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Scott Elder
Scott Elder
8/26/2013 10:48:02 PM
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Test vs. Design
I've always wondered why one finds HP/Agilent scopes favored by the test engineers on the test floor, but mostly only Tek scopes found in the design labs.

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Barry Harvey
Barry Harvey
8/27/2013 11:56:57 AM
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Re: Test vs. Design
Yeah, I've noticed that too.  I always wondered why they were bought in the first place; HP analog 'scopes didn't trigger well, have much bandwidth, nor flexibility.  Ironically, my favorite early digital 'scope was the HP54100.  Like Tektronix, it had flexible plug-in's.  It had a great menu system and did a random but slow sample, and could display 1GHz signals.

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BillWM
BillWM
8/27/2013 1:15:50 PM
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Re: Test vs. Design
I remember using the old DVST storage scopes back in my early days -- keeping the CRT from "Blooming" was always an art with those -- I even worked production doing old aircraft Navigation radars that Used DVST rather than Digital -- And I had a 465 with the TDR addon in the oil field for finding cable breaks/shorts.   Some interesting art in those old scopes.

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Barry Harvey
Barry Harvey
8/27/2013 1:30:18 PM
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Re: Test vs. Design
Still have a 7000-series storage mainframe in the lab.  I use it to make x-y plots mostly.  You can do this with some digital scopes, but when high-slope regions of display occur the sample pixels are sparse and pretty ugly.  Not so with the analog storage; nice continuous lines throughout.  Of course, phosphor storage is pretty cludgy.

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PZman
PZman
8/27/2013 3:14:27 PM
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Re: Test vs. Design
I also grew up with the 465 with the TDR option. Also have on my bench two Sencore scopes from the 1970's. Not a lab scope but great for troubleshooting, especially tube amps.

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DaeJ
DaeJ
8/27/2013 5:25:02 PM
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Heavy vs Light
Generally speaking, analog scope is really heavy because the old components of electronic might add the weight of scope and PCB board is really big. But when I used the digital scope, it is really not heavy. Also, when checking component inside board, the component is getting small and better performance compared with old components used in the analog scope. The light weight scope is better.

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Barry Harvey
Barry Harvey
8/27/2013 6:12:46 PM
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Re: Heavy vs Light
I dunno...I seldom lift my 'scopes.  If I were a travelling repair kind of guy, weight would matter.  Come to think of it, my Tesla S is damn heavy too but handles really well and is fast.  Reminds me of the 7104.

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DaeJ
DaeJ
8/27/2013 6:46:41 PM
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Re: Heavy vs Light
Weight comparison is based on the almost same functionality between analog scope and digital scope.

Well, I did carry scope and test the device from place to place. Then, I realized that old scope is more weight than that of new scope (digital scope).  I knew that some engineer measure the frequency response by Ipod.  It seem like smartphone is one- size- fits- all.

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jbike
jbike
8/27/2013 9:29:23 PM
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Re: Heavy vs Light
Well I must admit that after reading your blog I just about bid on a Tektronix 2465B oscilliscope on ebay. I may end up with one yet! I could not agree with you more about the analog scopes.

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RedDerek
RedDerek
8/27/2013 11:45:07 PM
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Master
Scope desires
I did enjoy the old Tek scopes with the phosphor screens. I remeber taking pictures with the polaroid camera as well. With phosphor screens going out, it might be an interesting project to tap into the X and Y drive of the screen and interpret onto an LCD screen. This would solve the bad phosphor issues.

I have traveled with the Fluke handheld scope a few times and we found that was the best scope to use when making power measurements across a 12 inch long, 1 inch diameter flash lamp. We used one channel for the differential across the lamp and the other for a current donut. Then let the scope do the math to calucalte the joules per pulse.

So, the analogs are great, but the digitals do have a good spot in my tool chest. I certainly agree that an analog could still capture somethings the digital cannot. Thus the idea of the screen conversion circuit.

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