| Electronics > Repair |
| DSO-X 3024A Power Supply defect |
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| Bud:
--- Quote from: EE-digger on January 17, 2024, 11:29:39 pm ---The NAND issues have been masked by redundancy and error checking. The NAND chip has a life of 10 years on paper (Micron). --- End quote --- 10 years for data retention, that is when you write once and leave it for 10 years. For erase/write cycles there should be a separate specs. For the Winbond NAND used in the DSOX 1200 (Linux- based) it is 100 000 cycles. So I'd say 10 years or 100 000 write cycles whatever comes first, for that particular IC. |
| Bud:
--- Quote from: EE-digger on January 17, 2024, 08:01:24 pm ---I would love to hear the Keysight take on these issues. --- End quote --- In the 1200x (Linux-based, black color) series scopes, including the EDUX 1052x model, beside the vanila ECC correction at NAND level, which does not seem helping much, they use UBIFS filesystem which has wear leveling feature. What it does is instead storing a file in a contiguous block of sectors, it sprinkles it all over the free pages across entire NAND partition. It also updates the erase counter for each page every time erase/wrire happens and monitors the counter against a set threshold. When a page erase counter exceeds the threshold, the page is marked bad and the data on it is moved to a new NAND page. This is general UBIFS feature, not specific to Keysight. They just decided to use UBIFS. While UBFS handles wear leveling, this may not help with random NAND cells corruption. I'd think plain corruption may still be happening, whatever a reason might be. On 1200x scopes Keysight has a separate Recovery kernel, which seems to be kicking in when normal boot cannot be performed. |
| EE-digger:
Posted some new findings on these supply failures here: https://www.eevblog.com/forum/testgear/stunning-3000a-2000a-3000t-power-supply-discovery-must-read-if-you-have-one/msg5300998/#msg5300998 On 120v mains, a new Murata vs the Scope factory supply is an eye opener. My pristine little 3000T was running at 397 volts when supply was removed and no load. Murata was at 168v. I may be missing the doubling+ mechanism for this but the voltage is there, the cap is very hot (will measure and image in the next days). For the most part, please reply in the other thread, I guess. |
| EE-digger:
Has anyone using the Murata PQC250 supply noticed a fair amount of audible noise from it, with or without load? I believe its coming from one inductor mounted on "stilts" toward the lower right corner (viewed with ac inlet on the left). Murata support says they've never heard noise from this series. If true, it may explain why I was able to buy these :) I've used a number of medical SMPS and never had a noise issue. |
| peterbitter:
Can I ask you to share please the possible wiring of Meanwell power supply (Meanwell RPSG-160-12) with the Keysight Many thanks |
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