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Re: [Amps] About LP100A

Subject: Re: [Amps] About LP100A
From: Manfred Mornhinweg <>
Date: Tue, 20 Jun 2017 21:35:06 +0000
List-post: <>

As a technician who used to work at Tektronix, I can assure you that
> digital scopes can do everything that analog van do

Can a digital scope do Lissajous figures?

The ones I have used cannot. They simply don't have a horizontal input!

My own work with both analog and digital scopes makes me think that they complement each other very well.

Very slow signals are essentially impossible to visualize on an analog scope. Instead on a storage scope it's child's play. But analog storage scopes are not the most common thing in the world, so it's here where digital scopes come in, as almost all of them work as storage scopes.

What I have found hard to do with a digital scope is hunting for problems. When I know beforehand what signal I have, and just need to measure it, digital scopes work fine. Instead if I don't know what I have, it takes a lot of effort to discover all details of a signal with a digital scope. Instead analog scopes don't "lie": They always show you all detail a signal has. The only thing you do is scale the image, horizontally and vertically, to see the parts that interest you. That makes it easy to discover spikes, transients, high frequency self-oscillations riding on the desired low frequency ones, and so on.

By the way, my 40 year old Tektronix D755 is asking for retirement. Too many totally worn potentiometers, contacts, etc, all of which are Tektronix special parts. Can you, or anyone, recommend a good scope available for a decent price? Are any of the Chinese ones good? I would love one that gets well beyond 100MHz. Just two channels is fine.


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