General > General Technical Chat
The Rigol DS1052E
rct:
--- Quote from: loydb on March 11, 2010, 12:55:09 pm ---Another newbie stumbling here from Hack-a-day. I'm in the market for my first scope, this is fascinating reading.
--- End quote ---
I'm in the same boat, doing research on my first scope purchase. I just posted a summary of some of the things I've learned at the RCgroups.com forum. The Rigol thread on that forum has been running for three years. Some of the discussion is about other models of the rigol (c,ca,...) but there is a lot of useful info there if you can wade through the 56+ pages.
[*] My summary post: http://www.rcgroups.com/forums/showpost.php?p=14568161&postcount=844
[*] Full Rigol thread staring at page 1, http://www.rcgroups.com/forums/showthread.php?t=663958
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It would be ideal if there was a wiki or something similar for summarizing the Rigol DS1052E info to help other newcomers.
Thanks,
--Rob
rossmoffett:
--- Quote from: JimBeam on March 11, 2010, 07:31:13 pm ---Hello everybody.
I am new to the forum - but I think I have to correct a few things here... :-[
--- End quote ---
Respectfully, your circuit is missing some information. There are two vias - possibly both controls (maybe one for the selectable BW limit and one for 50 MHz limit?). R1 in your circuit is not going to ground, it meets a via and connects to a capacitor which goes to ground. I did notice, and note, that the hack only requires the removal of one capacitor though. I'm not familiar with this type of circuit, so if you could elaborate some more that would be awesome!
I think given this new information, it might be possible that this could be modified with a software hack, rather than a hardware hack. Soon I'll be able to mess with that a bit more and see what happens.
Simon:
thats true, if you can get it to make the viarac go to it's maximum value all the time it would be "open" to all frequencies.
rossmoffett:
I just verified that this does in fact disable the bandwidth limit option in the Ch2 (modified) menu.
So the next step is to take it apart again and check those vias to see what kind of signals they're giving. One of them should respond only to the bandwidth limit select, the other is likely the 50 MHz limit, and perhaps there's a way to bypass the other without cutting the trace.
Otherwise, fiddling with the software may be the only choice.
JimBeam:
--- Quote from: rossmoffett on March 11, 2010, 09:27:36 pm ---Respectfully, your circuit is missing some information. There are two vias - possibly both controls (maybe one for the selectable BW limit and one for 50 MHz limit?). R1 in your circuit is not going to ground, it meets a via and connects to a capacitor which goes to ground.
--- End quote ---
Ooops, you are right! I did not measure this via - just estimating from the circuit that it was ground...
So we obviously have two control signals (circuit below), which could mean that this second signal indeed is causing the bandwidth "problem" - but before I take any further assumptions, I'm going to take some live measurements on my scope this evening. ;-)
--- Quote from: Simon on March 11, 2010, 07:54:20 pm ---so are you saying that if the variac diode is shorted all filtered limits are removed so the scope will be open to all frequencies ?
--- End quote ---
Not exactly for all frequencies, but at least to the limit the amplifier poses - and not if shorted, but if the diode would be removed. (The caps and resistors still present lowpass filters on both pin8 and 9, but this should be neglectible).
Andreas
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