That's a very nice scope.
I haven't had experience with analog storage scope,
how does it work?
Analog storage works by first writing a beam on the screen the same way as a normal scope and then firing a second ''flood gun'' onto the screen so that the image is retained. This scope has quite a high writing rate so storing very fast single shot events should be easy. If you then want to zoom in and maipulate the image then youre out of luck. It can't do that.
The 7934 also has a variable persistence which does just that. It controls how long the waveform will appear on the screen. You can have a dot moving very slowly (or very fast) across the screen and it will draw a line behind it.
Can I have more than 2 traces on it?
You can have as little as 0 to as much as 4 analog channels. Depenting on plugins, you can even display 16 channels of digital data using the logic analyzer plugin.
You can select the left vertical plugin to be linked to the left time base and the right to the right one. You can select which channel you want to trigger off for each timebase. Both sweep speeds can be individually adjusted.
Or you can link all channels to a single time base (left or right).
With 2 dual trace plugins this mainframe can display 4 channels all at once. With a dual delayed time base you can then display 4 more.
What do you think about the price?
100EUR for this mainframe is a very very good price. Especially in Europe. I just realized that you said 7934. I was thinking of the 7834.
![](http://What can be the possible weak points of this system<br />(something in particular to ask the seller before buying)?)
What can be the possible weak points of this system
(something in particular to ask the seller before buying)?
Not really.
The power supply is a bit harder to troubleshoot because it is switchmode and dangerous, but if it powers up then it is OK.
Tektronix also has a very good manual for troubleshooting this kind of power supply.
Ask the seller if he has some plugins.
![](http://In order to understand the total cost for such a system, what plugins should I<br />search for setting up a good working system?)
Some good plugins would be:
7A26 - dual trace,general purpose 200MHz, 1Mohm input
7A24 - dual trace, 400MHz, 50ohm inputs
7A22 - low level differential, 1MHz, 10uV/div sensitivity
7A13 - differential comparator, 100MHz, see ripple on large DC voltage, switchable high impedance input
7A19 - single channel but 500MHz, 50ohm inputs
7B80 - general purpose 400MHz timebase
7B85 - delaying time (NOT dual), 400MHz, can also be used as a standard 7B80
7B92A - dual delayed, 500MHz, saves space for other plugins
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)
7D14 - 500MHz frequency counter (or just use the signal output from the back of the scope and feed it into your Racal Dana 1992)
Of course you can buy only the ones that you need. You can always use your other scope for general work and use the 7934 for strange things (low level and HF measurments...)
and many many others depending on what you want: 14GHz sampling plugins? 60GHz spectrum analyzer? No problem.
http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_Test_Equipment.htm