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Need 5 second test from guys with multimeter
Posted: 15 Mar 2023, 13:47
by triplese
Checking one interesting hypotesis.
Need to gather statistics, for scientific approach I will not disclose more info till we dont have enough replies and visible corellation.
1. Take any 12V DC adaptor (like from your router), plug it in wall
2. Set multimiter to AC (~) 200, put one probe inside connector and one outside and measure digits.
- checking-adaptor-supply.jpg (23.26 KiB) Viewed 1856 times
3. Post it here
I will start - 26.2
Re: Need 5 second test from guys with multimeter
Posted: 15 Mar 2023, 20:20
by amorou
Router/modem adapter specs
Input: 0.5 amp
Output: 1 amper 12V
"25.3"
Re: Need 5 second test from guys with multimeter
Posted: 15 Mar 2023, 23:59
by Chief Blur Buster
Measuring the AC ripple in a DC voltage power supply, can show pretty crappy rectifiers/capacitors in a power supply (whether transformer or switching based). But it is not necessarily a yes/no answer for computer problems as many systems (beyond the barrel plug) filter the DC power even more, eliminating the AC ripple from reaching the rest of the router electronics.
Better to use an oscilloscope to see the graph shape. There can be good power filtering subsystem inside the router (past the barrel input jack) so AC weirdnesses in DC may not necessarily begin to interfere with what's inside the router -- although this can be bad for routers with extremely bad power filtering.
I've seen weird things like my mobile phone's touchscreen stop responding when I plugged it into a very crappy USB charger -- probably caused by various electrical interference from a crappy power supply. But that did not happen to another phone with the same charger (that had better power filtering behavior inside the phone beyond the charge port).
So, while bad power bricks can wreak havoc with gadgets, they don't always -- if the gadget has further power filtering.
Even so, this data is usually useless for confirming problems in your computer -- just because there's bad electricity and bad lag, doesn't mean the lag, in a roundabout domino-effect way, is caused by the bad electricity itself (e.g. error correction events / inferior RF signal / inferior Ethernet signal, etc).
Re: Need 5 second test from guys with multimeter
Posted: 16 Mar 2023, 06:16
by amorou
Chief Blur Buster wrote: ↑15 Mar 2023, 23:59
Measuring the AC ripple in a DC voltage power supply, can show pretty crappy rectifiers/capacitors in a power supply (whether transformer or switching based). But it is not necessarily a yes/no answer for computer problems as many systems (beyond the barrel plug) filter the DC power even more, eliminating the AC ripple from reaching the rest of the router electronics.
Better to use an oscilloscope to see the graph shape. There can be good power filtering subsystem inside the router (past the barrel input jack) so AC weirdnesses in DC may not necessarily begin to interfere with what's inside the router -- although this can be bad for routers with extremely bad power filtering.
I've seen weird things like my mobile phone's touchscreen stop responding when I plugged it into a very crappy USB charger -- probably caused by various electrical interference from a crappy power supply. But that did not happen to another phone with the same charger (that had better power filtering behavior inside the phone beyond the charge port).
So, while bad power bricks can wreak havoc with gadgets, they don't always -- if the gadget has further power filtering.
Even so, this data is usually useless for confirming problems in your computer -- just because there's bad electricity and bad lag, doesn't mean the lag, in a roundabout domino-effect way, is caused by the bad electricity itself (e.g. error correction events / inferior RF signal / inferior Ethernet signal, etc).
Effort you put in this forum is tremendous , thank you chief
Re: Need 5 second test from guys with multimeter
Posted: 19 Mar 2023, 18:14
by F1zus
This is bullshit. You need a normal spectrum analyzer (it happens as a function of expensive oscilloscopes), or there are separate devices from $ 100. It shows the level of harmonics from 1Hz to 10MHz. In this way, you will see the complete picture in your electrical network and be able to understand the real level of harmonics. It is the harmonics that cause the input lag.
Re: Need 5 second test from guys with multimeter
Posted: 23 Mar 2023, 19:14
by triplese
F1zus wrote: ↑19 Mar 2023, 18:14
This is bullshit. You need a normal spectrum analyzer (it happens as a function of expensive oscilloscopes), or there are separate devices from $ 100. It shows the level of harmonics from 1Hz to 10MHz. In this way, you will see the complete picture in your electrical network and be able to understand the real level of harmonics. It is the harmonics that cause the input lag.
So demonstrate us corellation between clean electricity/harmonics-dirty and input lag with your spectrum analyzer please
If that true, any $10 DIY low-pass filter will work. And all PSUs have it by design.
BTW spectrum analyzer costs $1000, not $100.
Re: Need 5 second test from guys with multimeter
Posted: 23 Mar 2023, 21:27
by Chief Blur Buster
That is why I am almost never a fan of troubleshooting EMI.
You can try to solve some of it if you own your house (e.g. install a whole house power conditioner)
Easier to just shotgun approach and use offgrid technique if electrical fault is coming from the grid. A power station powering your router and PC. Cordless peripherals, and optical fiber + media converters between router and PC, so no metal is touching the PC from any electricity or any Internet connection. A 1 to 2 kilowatt power station costs approximately same as a spectrum analyzer, but massively more useful (you can take it camping, you can use it during blackouts) and shotguns practically 10%+ of millions of possible external electrical-related EMI issues, and if it doesn't work, it's still useful. And ideally, ground wired to a metal pipe to avoid the floating-ground effect.
Anyway, it's a last-resort. Most CS:GO desync problems aren't EMI/interference.
Re: Need 5 second test from guys with multimeter
Posted: 24 Mar 2023, 00:28
by Chief Blur Buster
Let me rephrase.
That is why I am almost never a fan of these kinds of troubleshooting approach methods EMI for most average computer using people, rather preferring to solve EMI via much easier shotgun-based approach where broader solutions are attempted to solve multiple potential causes, rather than single-causes surgically.