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Search: Posts Made By: ITelektro
Forum: Testing Methodology Discussion 01-26-2017
Replies: 29
Views: 12,230
Posted By ITelektro
Define term "clean voltage", please. 4mV...

Define term "clean voltage", please.


4mV and 8mV, double difference is not irelevant. It is only if its easy for PSU manufacturer to archive that. Is it? I dont think so.
I suggest in order to...
Forum: Testing Methodology Discussion 01-25-2017
Replies: 29
Views: 12,230
Posted By ITelektro
Maybe, but first of all we must define what is...

Maybe, but first of all we must define what is clean source or, in other words what is not clean source.
Every PSU have some PSRR (power supply rejection ratio) so noise will be reject depend of...
Forum: PC Power Supply Discussion 12-13-2016
Replies: 4
Views: 1,572
Posted By ITelektro
But in that case we can analyze in detail the...

But in that case we can analyze in detail the cause and the relevance of these anomalies as well as frequency they occur.
Random noise will occur randomly at wave form, swithing noise will occour at...
Forum: PC Power Supply Discussion 12-13-2016
Replies: 4
Views: 1,572
Posted By ITelektro
Ripple is quite precisely defined in many...

Ripple is quite precisely defined in many documents.In none of them is not mentioned that occasional spikes should be ignored in the measurement.

If spikes are absent on an oscilloscope in each...
Forum: Testing Methodology Discussion 11-25-2016
Replies: 29
Views: 12,230
Posted By ITelektro
I watched video...

I watched video (https://www.youtube.com/watch?v=OiAmER1OJh4) yesterday, a great work by Dave's, as usual.
Although there Passive probes that are suitable for these measurements, but they are quite...
Forum: Testing Methodology Discussion 11-24-2016
Replies: 29
Views: 12,230
Posted By ITelektro
It's been a while..... Measuring ripple in...

It's been a while.....

Measuring ripple in ms range may miss high freqvency wave forms like switching transient noise or random noise, even switching ripple. It will depend of equipment that we...
Forum: PC Power Supply Discussion 11-09-2016
Replies: 24
Views: 6,118
Posted By ITelektro
I am thrilled with your work, very representative...

I am thrilled with your work, very representative review.
I noticed a small mistake.

You mean ideal constant voltage source?
It is very nice to see the evolution of switch power supply, ie...
Forum: PC Power Supply Discussion 11-04-2016
Replies: 32
Views: 3,988
Posted By ITelektro
Tdelay3 is internal OCD deley time. Tg1 is...

Tdelay3 is internal OCD deley time.
Tg1 is De-glitch time when OCD state is active.
When OCD is in active state then current surge that last 150us will change state of FPOB. So in working...
Forum: PC Power Supply Discussion 11-04-2016
Replies: 32
Views: 3,988
Posted By ITelektro
Its quite basic datasheet so there is no detail...

Its quite basic datasheet so there is no detail information.
If I understand well, you asking me how this works, it will be quite difficult to me for explain.
At input there is few op amps that...
Forum: PC Power Supply Discussion 11-04-2016
Replies: 32
Views: 3,988
Posted By ITelektro
Right Looks very similar but pratctical...

Right

Looks very similar but pratctical results will be significant different. Will try to explain.
Current spikes are quite often, in case that current protection check current only in those two...
Forum: PC Power Supply Discussion 11-04-2016
Replies: 32
Views: 3,988
Posted By ITelektro
When an over current condition appears, OCD...

When an over current condition appears, OCD signal change state to 1. If time of this state exceeded de-glitch time for OCD(Tg1) then fault protetcion output pin will change state (FPOB).
In other...
Forum: PC Power Supply Discussion 11-01-2016
Replies: 59
Views: 12,602
Posted By ITelektro
Very good and detailed explanation of the desired...

Very good and detailed explanation of the desired waveform. I see no room for interpretation. Anybody see something I miss?
Technically, testing should be only as a pass fail option. If power supply...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
...... EDIT; Aris pulled argument calibration...

......
EDIT;
Aris pulled argument calibration equipment, he's right. In all the results of the measurements we must have information of accuracy of measuring instruments and shown test methodology...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Specified by Intel ..... if I'm not mistaken. ...

Specified by Intel ..... if I'm not mistaken.
To my knowledge there are only two states, on and off.(for SSR)
There will be some kind of slew rate but you will not have the ability to control it.
...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Quote exactly where I wrote something like that. ...

Quote exactly where I wrote something like that.
If we can discuss about test methodology, dc load and general technical stuff, ok, but if you're going debate down to the personal level implying...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Hint : 1A example. That has nothing with...

Hint : 1A example.

That has nothing with same test conditions.

Yes, I agree.

IMO: Results you get for one sample is result of that sample unit.
Scientific approach uses the term...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Example? One of the options. The second is...

Example?

One of the options.
The second is that the author simply made a mistake. I think that's the reason.
We all make mistakes, somebody accept the mistake, correct it ,learns from it .......
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Its not good example. If the test conditions,...

Its not good example. If the test conditions, metodology, accuracy are same , measured result will be same. Thats way I put example of 1A on the table.
Different PC cofiguration means different test...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
I'm sorry but I do not accept someone's opinion...

I'm sorry but I do not accept someone's opinion without a logical, practical, mathematical explanations just like that.
The contested statement is nothing more than just an opinion based on a...
Forum: Testing Methodology Discussion 10-16-2016
Replies: 40
Views: 10,031
Posted By ITelektro
I do not know what to say at this ..... If you...

I do not know what to say at this .....
If you use a 7.5 digit multimeter then the results will be not repeatable by other person because 7.5 digit multimeter is not an ordinary, therefore it...
Forum: Testing Methodology Discussion 10-15-2016
Replies: 40
Views: 10,031
Posted By ITelektro
That is so wrong, but I would certainly like to...

That is so wrong, but I would certainly like to hear arguments for such a thing to write.

And even in this case it is still wrong.
Diy dc load is not a measuring instrument, it's just a load....
Forum: Testing Methodology Discussion 10-15-2016
Replies: 40
Views: 10,031
Posted By ITelektro
I just read this on Tom's Hardware site. ...

I just read this on Tom's Hardware site.
According to this, it appears that with diy elecronic load is not possible to make accurate results. Perhaps author of this text is participating on this...
Forum: Testing Methodology Discussion 10-15-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Oh this old thing ..... I will never get over...

Oh this old thing ..... I will never get over because I sold the old analog oscilloscope Hameg .....;)
I tried the cheap ones from a couple of dollars and those of 30usd ..... just do not have...
Forum: Testing Methodology Discussion 10-14-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Accuracy is not a problem, but precision is....

Accuracy is not a problem, but precision is. Accuracy is not something that worries me, for this application 1% is quite acceptable, while large differences in precision, at least for me, is never...
Forum: Testing Methodology Discussion 10-13-2016
Replies: 40
Views: 10,031
Posted By ITelektro
Well .... it depends. If you design for yourself...

Well .... it depends. If you design for yourself you can oversize. Trust me, it will be still far away from the purchase price of Sunmoon.
I decided to MOSFET design. Each MOSFET theoretically can...
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