Products > Test Equipment

Rohde & Schwarz RTO1024 upgrade ??

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nctnico:
Maybe try to clean the contacts of the interconnect boards with alcohol. Don't use contact spray (unless you want to put the oscilloscope in the trash next year)!

jjoonathan:
To anyone thinking about upgrading but scared by this problem: you do not need to touch the acquisition boards to perform a WinXP -> Win7 upgrade. This is a separate problem. If you go ahead with an upgrade, resist the temptation to poke around at the acquisition boards. They have a mechanically weak connection that is easy to break and will land you in the same boat as myhobo if you do.

Sorry, I don't have a service manual.

However, we shouldn't need one. We know which circuit is responsible for the problem and we can guess how it works. There are 9 differential pairs coming out of each 8-bit ADC. This strongly suggests that the interface is parallel: one differential pair per bit plus one differential pair for data clock (generated by ADC). The problem could theoretically be anywhere in the ADC, but the ADC->FPGA bus is a known weak point. With the front and back screws removed, those three cards are the only mechanical connection keeping the top and bottom boards in vertical alignment. It would be very easy to accidentally break one of them, or, more likely, one of the sockets they plug into.  The fact that the problem is on channel 3/4 suggests it is the rear right card/socket that is problematic. If I understand correctly that you swapped the channel 1/2 card with the channel 3/4 card and the problem persisted, we should strongly suspect the problem is with one of the channel 3/4 sockets. Cleaning the sockets is a good idea but if one of the chn 3/4 sockets got crunched it won't be enough.

Strategy #1: test for connectivity with a multimeter.

Strategy #2: put a full-scale triangle or sawtooth waveform into channel 3/4 and look at the corrupted waveform. If bits (=diff pair channels) are pinned or scrambled, we should be able to tell which bits by looking at the resulting waveform. If the clock is bad, we will tend to see artifacts around bit transitions like 00111111 -> 01000000.

Strategy #3: cut the sheet metal at the back of the machine (it will need to be put back with foil) and use an EMC probe + spectrum analyzer to check each differential pair for activity.

jjoonathan:
Hey everyone, service passwords for 3.70.1.0    ;D

Enter them in File > Maintenance > Service > Password. If entered incorrectly, the message "Password incorrect" will display and the incorrect password will remain in the entry field. If entered correctly, no message will display but the password will vanish from the field and a new menu will be available according to the password entered.

Password: 894129
    File>Service
        VCO, OCXO DACs
        MSO alignment, thresholds, hysteresis, tests (HW missing)
        Power rail voltages, but checking "Get Values" doesn't actually get values
        AWG/Wavegen (HW missing)

Password: 16052008f
    File>Service 2
        ADC Temperatures, fan settings
        Droop DACs, Gain DACs, RDACs, CDACs, all the DACs you could want and more
        "Pro" calibration -- lots of detail, options (calibration options, not that kind of options, lol)
        Aux Out at frequencies other than  1GHz
        Interleave setup -- I'm not brave enough to poke it
        EEPROM flash


I'm most interested in the ADC temperatures. They aren't exposed to Windows as far as I can tell and I occasionally get overtemp errors on ADC2. Now I can keep an eye on it. It is indeed the hottest, though not by a gigantic margin. I wonder if there's a way to configure the fans to be a bit more aggressive?

jjoonathan:
Hey, there are team photos in the secret service menu  ;D

myhobo:
this is my oscillioscope picture.

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