Products > Test Equipment
SDS1104X-E, backup power supply
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TomKatt:

--- Quote from: 2N3055 on February 14, 2023, 03:50:14 pm ---
--- Quote from: Fungus on February 14, 2023, 03:22:30 pm ---
--- Quote from: TomKatt on February 14, 2023, 02:30:07 pm ---Considering that the first thing power hits in a SMPS is a bridge rectifier, they can pretty much run off anything with sufficient voltage to trigger the oscillator.

I doubt gear like this takes all that much power - I'm surprised I haven't stumbled across a true 12v supply solution for them...   Mobile portability would be really handy!

--- End quote ---

12V probably isn't enough to trigger the supply. I'm sure you could do it with a 12V to 48V DC converter though.

--- End quote ---

PSU in these are 90-240V AC RMS, roughly...
Running it a too low voltage would be hard on PSU (needs more current).....
It is not approved by manufacturer and any damage won't be in warranty.

And converter 12>220 that doesn't put out too much voltage spikes would do...

--- End quote ---

I understand that 12v won't work on the mains psu inside.  I'm thinking more along the lines of a "replacement" psu that runs off 12v and creates the +15v, +6.5v and -9.5v rails used by the SDS1104X-E...  I can't imagine any of those require significant current.  Shouldn't be too hard to design a 12v based power supply that generates those voltages in a package small enough to fit inside the scope...  The manual specs power consumption at up to 25 watts, but I suspect it's less than that.

tautech:

--- Quote from: Fungus on February 14, 2023, 03:22:30 pm ---
--- Quote from: TomKatt on February 14, 2023, 02:30:07 pm ---Considering that the first thing power hits in a SMPS is a bridge rectifier, they can pretty much run off anything with sufficient voltage to trigger the oscillator.

I doubt gear like this takes all that much power - I'm surprised I haven't stumbled across a true 12v supply solution for them...   Mobile portability would be really handy!

--- End quote ---

12V probably isn't enough to trigger the supply. I'm sure you could do it with a 12V to 48V DC converter though.

--- End quote ---
You can't.
Recently tried and pushed 100VDC @ 3A into mine and it wouldn't start.
However it is a first generation build SN# 0013 and there is a chance the PSU has been changed IDK.
Linwood:

--- Quote from: Fungus on February 14, 2023, 03:27:17 pm ---
--- Quote from: Linwood on February 14, 2023, 03:06:14 pm ---I wouldn't say I know what I am doing, just that I understand well enough not to hurt myself or the scope from handling the grounding incorrectly. 

--- End quote ---

Make sure your probe is set to 10x.

Me? I'd get a fixed 10x or even fixed 100x probe. Those little probe switches are a liability for work like this.

(and 100x probes usually have better insulation)

--- End quote ---

Thanks.  Honestly I can't see why I want to do this more than once, for that generator (or if I replace it). I know my cheap UPS' are crap, I know utility power is a sine wave, I don't need to look at it every week to see those things have not changed. 

My main use case (yet to be seen if useful) is when I get interference patterns and other issues in my astro imaging gear, to get some insight into what parts are noisy and how and when.  Secondarily about once I hear I build some esp8266 or rPi thing (light, weather component, etc.) and occasionally have struggled to figure out what I was doing that was dumb limited to a DVM.

Definitely not a power supply builder or some such that needs to probe high voltage on a regular basis.

Linwood

PS. Amazon finally delivered it, then an hour later sent me a note that said they were trying to find it and get it shipped to me, so I might get two.   :)  Four probes adjusted, four channels come on and show a square wave, so happy so far. Need to break out some old 8266 device and poke around a bit just to learn.  Dragging out the generator will wait for a better day when I feel like actually working (since when done I need to "winterize" it for storage, drain all the fuel, etc. ).
JeremyC:
@Linwood

You need double-conversion UPS, but they are expensive. I doubt you will be able to find 1000 VA below $700. Example in link below
https://www.amazon.com/Maruson-Tacoma-TAC-LV1K-1000VA-Online/dp/B01ELPJJQA/ref=sr_1_4?keywords=double%2Bconversion%2BUPS&qid=1676433875&refinements=p_72%3A1248879011&s=pc&sr=1-4&th=1

Standard UPS (line-interactive) connects power from battery inverter only when the main power will fail, otherwise is acting as pass trough with some filtering. It applies to the “true sine wave” too.
Linwood:

--- Quote from: JeremyC on February 15, 2023, 04:24:37 am ---You need double-conversion UPS, but they are expensive. I doubt you will be able to find 1000 VA below $700.
--- End quote ---

Well, I don't "need" one, really, which is why I have some cheap ones running my network gear so (for example) VoIP phone works when the power is out, at least for a while.  I might like to have one, but it does not seem worth it.

Unless you are saying I need one for the scope when power is out, but the suggestion to use the EV car seemed viable.
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