Products > Test Equipment
DG4000 - a firmware investigation
dpenev:
Hi Teneyes,
Yes you seems to have 1ns shift in the trigger point issue in yoru scope?
Dimitar
rf-loop:
--- Quote from: Teneyes on February 03, 2015, 06:53:32 am ---
--- Quote from: rf-loop on February 02, 2015, 07:53:49 pm ---Did you use exactly same cable lenght (and not only physical lenght but with around same travel time lenght because it matter. And images looks like there is signal travel time differencies between cables - and impedance mismatches)?
--- End quote ---
@rf-loop, Yes the DG4000 generator was set to 50ohm output and there was a 50 ohm feed-thru termination on the DS2000.
--- End quote ---
Reason for this my question was just there. 50ohm feed thru in oscilloscope input is not 50ohm impedance.
So, these "waves" in sweep shape level tell that there is somewhere mismatch or scope front end itself is weird. I believe more mismatch. Genrator output... it is not true 50ohm impedance, scope input is not at all 50ohm impedance when there is 50ohm feed thru. Cable... what difference come from cable qualitu itself and whhaat come from testing quality for this named purpose - classifying cables quality. For this work you need other tools or just very strong "believe".
H.O:
Hi,
--- Quote ---Yes the DG4000 generator was set to 50ohm output and there was a 50 ohm feed-thru termination on the DS2000.
--- End quote ---
Just a note, may not have relevance to the current topic but anyway: On the DG4000 you can't, as far as I know, change the actual output impedence, it's always a nominal 50 ohms. What you do when you enable the "50 ohm output impedance" is telling the generator that the external load connected TO the generator is 50ohm, it then changes the displayed amplitude etc with this taken into consideration. (Cutting it in half compared to the "High Z setting").
EDIT: Actually, you can enter any load resistance you want (from 1ohm to 10k) and the DG4000 will scale the displayed amplitude and offset values accordingly. The actual output resistance/impedense is always a fixed 50ohm (nominal). More details to be found on page 10-5 in the manual.
GonzoTheGreat:
It seems that now there is another reason to upgrade to firmware v1.09 :(
ytsejam:
Hi cybernet,
I own a DG4062 with latest FW 1.10. Just wondering if it is possible to revert the bootloader and firmware version to 1.08 by JTAG with mem dumps by 1.08 owners? Could you please help to shed some lights?
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