General > General Technical Chat
The Rigol DS1052E
darrylp:
--- Quote from: Crippled on December 15, 2010, 10:54:19 am ---.....
I wonder if there are bare jtag pins on the pcb?
--- End quote ---
http://www.rcgroups.com/forums/showpost.php?p=14825548&postcount=49
tinhead:
--- Quote from: EECrAZY on October 31, 2010, 03:38:11 pm ---Yeah, looks like Tekway is a improved copy of Rigol with some changes on ADC/FPGA/LCD part.
Analog inputs are just routed differently and all that trigger support circuitry looks also very similar with the same parts...
I am still curious what is all that circuitry is supposed to do? Would not 1 comparator be enough? I noticed there is a LT1790 reference chip, I thought it could be used for self calibration, but turns out like it feeds a REF pin of LTC2601 DAC. Rigol board does not have those parts.
There are a few analog multiplexers there with -1Db drop at 100Mhz, Could that be a bottleneck? Seems like the rest of the components would handle 200Mhz+ not a problem
--- End quote ---
i did checked what the LTC2601 and LT1790 are for. The DAC vout is conected via 4051 analog mux over TLV274C to the varicap
in lowpass filter (that's the Control 2 signal from link below, i was wondering where the "2.7V" and "100mV" are coming from,
for sure not from hc595 so i traced back to the middle TLV274 in trigger stage).
https://www.eevblog.com/forum/index.php?topic=30.msg2697#msg2697
Rigol is a bit different, no idea why (maybe just because Tekway have 3 bw's with same design and Rigol only 2)
macpod:
Is it possible to save on-screen measurement and cursor values in the bmp along with the waveform with the Rigol DS1052E?
Currently when I save a bmp only the waveform is saved and I can't find a setting to change this.
edit: Huh, I seem to be able to save everything now. I think the issue was I entered the disk manager instead of pressing the external button to save to the usb stick.
Nevermind!
jedreg:
Hi everybody,
I was drilling for some time the subject of Rigol but just recently noticed that software upgrade for FW 02.05 is not (yet) possible. I believe one day some smart guy bring the SW hack, but meanwhile I would like to make sure, there is backup with hardware hack (I am hobbyist :). I have read initial posts but I have not seen that removal of C1 (on drawing in this post) is confirmed as valid. And what about range for wider bandwidth, will the DSO switch to faster time base or just measurements/interpolation will be more accurate?
cheers,
andy.
tinhead:
--- Quote from: jedreg on December 27, 2010, 12:24:45 am ---Hi everybody,
I was drilling for some time the subject of Rigol but just recently noticed that software upgrade for FW 02.05 is not (yet) possible. I believe one day some smart guy bring the SW hack, but meanwhile I would like to make sure, there is backup with hardware hack (I am hobbyist :). I have read initial posts but I have not seen that removal of C1 (on drawing in this post) is confirmed as valid. And what about range for wider bandwidth, will the DSO switch to faster time base or just measurements/interpolation will be more accurate?
cheers,
andy.
--- End quote ---
Andy,
i did published schematics of Hantek/Tekway DSO input stage, they similar to what you will find in Rigol
https://www.eevblog.com/forum/index.php?action=dlattach;topic=1571.0;attach=5089
From the schematic you can see that pure hardware hack can work (AD8370 output impedance 95 Ohm, varicap and the two 160pf are low pass filters)
however this is only a part of the story. The firmware itself, if switched to higher model, is working different and have more options (time base).
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