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| R&S RTB2004 front USB 5V power output? |
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| skander36:
--- Quote from: gdr771 on October 16, 2024, 02:45:42 pm --- --- Quote from: skander36 on October 02, 2024, 06:47:24 pm ---Micsig DP10013 tested with RTB2002 works without problems. Maybe you have Micsig DP1500 from description. --- End quote --- Micsig completely redesigned the probe into a two-part device but used the exact same model number. I have the new version shown in the attached photo. (Attachment Link) Which version do you have? --- End quote --- I have the old version, the white one. Strange thing, on their site this black model is not listed as a new model. Instead is a mention: "*The previous model DP10013 has been upgraded to DP1500. " |
| nctnico:
--- Quote from: tooki on October 02, 2024, 07:27:20 pm --- --- Quote from: nctnico on October 02, 2024, 06:46:03 pm ---The whole USB power delivery situation is a huge mess; better design something that has wide margins for as long as it doesn't make attached devices go up in smoke. --- End quote --- Well, find a time machine and tell early-90s Intel that USB will become the dominant DC charging port. Back when they designed it, nobody even distantly envisioned it as a de-facto DC power supply standard. The little bit of power envisioned was just a courtesy so small gadgets wouldn't need a separate power supply. At the time, storage devices and the like were envisioned to use FireWire, which had up to 1.5A of power (at 9-30V), though actual available power varied wildly by system. It's so easy to forget that USB only accidentally became the de-facto DC power supply standard (and later still a de-jure one in the EU!), since it's now everywhere. Had we known that back then, we doubtless would have designed it differently. But it's disingenuous to decry as poor the decisions made ages ago in a context where those decisions absolutely made sense. --- End quote --- Now you are pulling my words a bit out of context I'm afraid ;) The reason for the mess is not due to bad decissions in the past as it was impossible for the original designers to even dream about how USB turned into a universal power delivery standard. The reason for the mess is manufacturers and the USB design commitee comes up with standard upon standard. Nobody is to blame but it is a mess nonetheless. I'm involved in the design of a device which tries to deal with it all and that is far from easy. Besides USB-C there are about a dozen manufacturer specific charging solutions (example: Qualcom's Quickcharge aka QC in 5 different iterations). Hence my suggestion that if you design something with a USB socket which could be used to power some kind of device, be as generous as you can where it comes to inrush currents and current consumption. As a designer of a USB powered device (which doesn't require USB-PD), try to stay below 500mA if you can as the majority of the 'dumb' USB sockets are likely to be able to supply at least 500mA. These are just simple guidelines which will make life of the user of your devices easier. But in the end it is logical that a host port limits the current to its design limit. If you use an unpowered hub, then the host port -assuming it has current limiting- will shut everything down when all the devices connected to the hub (together) start drawing more current than the host port can supply. |
| gdr771:
--- Quote from: skander36 on October 16, 2024, 03:30:19 pm ---I have the old version, the white one. Strange thing, on their site this black model is not listed as a new model. Instead is a mention: "*The previous model DP10013 has been upgraded to DP1500. " --- End quote --- Here's the alleged specs of my new-style DP10013, also straight from their website. The photo above this chart on their webpage is of the new-style probe: |
| skander36:
Yes Micsig site is a mess, when is loading ... On the DP page, DP1013 cannot be found anymore, just the mention that it was upgraded. Only your direct link got me to the DP1013. They excel at this behavior lunching products that easy disappear like UPI bus or DP750 or not appear anymore like Remote for TO oscilloscopes The old version of DP1013 draw about 147 mA from USB. |
| gdr771:
Thanks for looking at this. And, nice scope! Today this new-version DP10013 probe reset a few times with the Micsig-supplied wall adapter before luckily getting past the inrush at the 1-second mark. So I'll either send the probe back or make an inline power buffer. |
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