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| The Rigol DS1052E |
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| rossmoffett:
--- Quote from: vr2whf on May 02, 2010, 07:32:31 pm ---Just spot a difference in the analog front-end between DS1052E and DS1102E http://img198.imageshack.us/i/rigol1052vs1102.jpg/ According to the picture provided by this guy, the primary difference is the DS1102E uses the B3GA4.5Z relay to replace the smaller relay COSMO Y214S used by DS1052E. I don't know if there is any performance difference in these analog front-end circuits. --- End quote --- We've known about that for quite some time. :-) I know the thread is long, but it's in here. My DS1052E has the same parts as the DS1102E, it's a later revision than Dave's (pictured) scope. If you look far enough, you'll see that I drew up a schematic of what I believed the difference was at the time, and later another user corrected things I had missed. There is a filter with a diode cutoff.. using two control voltages the filter can either be enabled or disabled by reverse biasing the diode or not. This user even tested the control voltages before/after modification and verified that this is the sole control on the analog front-end (I believe). He was the first person to do the software mod by serial port. User JimBeam, I think, Dave credited his real name in his first mod video. |
| rf-loop:
Most of oscilloscopes what I know have "service calibration" or what ever name they use. I think there is some way how factory (or service) run special calibration process after new scope HW is ready. After HW production every scope need maybe some individual parameters. My opinion is that normal "selfcal" do not all these. How to enter this special mode? (if there is any) I have look many times FW but can not find any good idea how. Maybe scope have some special startup (example startup with some keys pressed (many different machines have some "hidden" way to do some service specials) or something else or some command via USB or serial port) How we can find these? |
| alm:
--- Quote from: rf-loop on May 04, 2010, 03:04:00 pm ---Most of oscilloscopes what I know have "service calibration" or what ever name they use. I think there is some way how factory (or service) run special calibration process after new scope HW is ready. After HW production every scope need maybe some individual parameters. My opinion is that normal "selfcal" do not all these. --- End quote --- Agreed, it's likely that the scope needs external signals for this, the selfcal is just to compensate offsets generated by temperature differences. --- Quote from: rf-loop on May 04, 2010, 03:04:00 pm ---How to enter this special mode? (if there is any) I have look many times FW but can not find any good idea how. Maybe scope have some special startup (example startup with some keys pressed (many different machines have some "hidden" way to do some service specials) or something else or some command via USB or serial port) How we can find these? --- End quote --- I would expect them to be initiated from USB/serial, since they'd want to automate it as much as possible. If you're lucky, it might be the same procedure as used for annual calibration at a cal lab, this should be documented in the service/calibration manual (is there such a thing? gotta love Chinese companies and documentation). It might be documented for the Agilent version of the scope (although the Agilent firmware is not the same, so it could be different), HP/Agilent is usually quite good at documentation. If the initial calibration is a different process, it's unlikely to be documented, and I expect it would be hard to reverse-engineer this, since it'll probably need specific signals and specified steps. |
| Simon:
the self cal will also compensate for self generated signal the scope picks up. when I removed the "shield" I had put around the power supply the trace had a negative offset and i had to recallibrate the scope as i had to when I put the shield on |
| Polossatik:
--- Quote from: alm on May 04, 2010, 04:00:56 pm --- It might be documented for the Agilent version of the scope (although the Agilent firmware is not the same, so it could be different), HP/Agilent is usually quite good at documentation. --- End quote --- Hum, I aasume the DSO1002A is the one that is supposed to be the Agilent version of the Rigol DS1052E ? They look quite similar from setup/build, but the specs are quite different. "2 GSa/s sample rate half channel, 1 GSa/s each channel " rigol : 1GSa/s for one channel or 500MSa/channel when using "deep" memory same for the " 20 kpts memory half channel, 10 kpts each channel " vs "16 kpts one channel, 8kpts/channel when using 2 channels" for the rigol. I assume "half channel" is the Agilent terminology of using "half of the channels available (= 1 channel)? I can't find any reference on the Agilent site about something like the Rigol's "1Mpts long Memory Depth"... |
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