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Measuring power supply ripple with Siglent 1202X-E

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BillyO:

--- Quote from: tautech on September 03, 2023, 02:16:57 am ---
--- Quote from: BillyO on September 03, 2023, 01:48:20 am ---
--- Quote from: tautech on September 03, 2023, 01:27:20 am ---And some will learn hard lessons buying the cheapest, untested/unproven pretty looking gear.
Also just saying.

--- End quote ---
I'm in complete agreement on this.

However, in the extreme if all you have is $50 to buy a scope then a $50 scope is better than no scope.  Think of it as a "gateway" instrument.  The neophyte will learn some things and be able to visualize signals which will aid their progress in their electronics hobby to the extent they will eventually find themselves in need of a better instrument and understand the value in the purchase price.

--- End quote ---
Instead many also learn a scope is just the start, HV, differential and current probes are also must haves and investments in that can be used on any scope although it is very useful to have input attenuations settings that can match any probe instead of in your head calculations like we had to do with CRO's.  ::)
Back in them days I played a lot with magnetics and then you could find the great P6021 current probe for under $100 but sadly far less so these days.
CRO's, I had a few and several Tek DSO's also, none of which can compare with modern DSO's of the last 5 or so years.

--- End quote ---
I'm looking to expand (it's a disease, I tell ya what!) but I think a real differential probe will never be a part of my kit.  But maybe a half decent current probe.

I just bought a new truck.  A Toyota Tacoma with all the trimmings.  I usually take good care of my vehicles and it will probably last me 15-20 years.  It cost $56K.  It's kind of funny but that kind of money is a pittance to what you can spend buying a TOTL oscilloscope or other piece of best in world test equipment.  But those are on a different level.  For the most part they can't even be applied to the stuff most of us work with.  You literally have to design the DUT to be tested by them.

Anyway.  I still have 2 CRO's.  Kind of a part of my hobby is to use vintage test equipment to work on vintage electronics.  I even have a separate "vintage" bench.
One scope is a venerable Tek 465, the other I just picked up recently for $40, is a Heathkit IO4205.



It's a 2 channel, 5MHz monster from the 80's and is a total nostalgia boost for me.  My first scope ever was the Heathkit IO4105 I built in 1980.  The single channel version.  Speaking of boot times .. 7 seconds to visible traces.  Anyway, it may be ancient and it may be a CRO and it may be as big as a microwave oven, but it's a darn sight better instrument than any cheap little $40 2" screen, single cahnnel 200KHz scope like the DSO138.

tautech:

--- Quote from: BillyO on September 03, 2023, 02:46:21 am ---I'm looking to expand (it's a disease, I tell ya what!) but I think a real differential probe will never be a part of my kit.  But maybe a half decent current probe.
--- End quote ---
Mostly a differential probe doesn't need to be too flash but provide good voltage isolation.
Something like the old DP25 used with care can serve you well.
https://www.pintek.com.tw/productDetail/land-ctop-2/index/pscsn/17072/psn/19265


--- Quote ---I just bought a new truck.  A Toyota Tacoma with all the trimmings.  I usually take good care of my vehicles and it will probably last me 15-20 years.  It cost $56K.
--- End quote ---

 :scared: Never ever spent that much on wheels.  :o


--- Quote ---It's kind of funny but that kind of money is a pittance to what you can spend buying a TOTL oscilloscope or other piece of best in world test equipment.  But those are on a different level.  For the most part they can't even be applied to the stuff most of us work with.  You literally have to design the DUT to be tested by them.
--- End quote ---
Yet as you know for what your new wheels cost you can now set up a very respectable lab with what the leading Asian brands offer.


--- Quote ---Anyway.  I still have 2 CRO's.  Kind of a part of my hobby is to use vintage test equipment to work on vintage electronics.  I even have a separate "vintage" bench.
One scope is a venerable Tek 465, the other I just picked up recently for $40, is a Heathkit IO4205.
--- End quote ---
Basically that's how I got/fell into this game after fixing my first gifted CRO when in my 40's as life had been too busy to continue with electronics since a childhood start.
After fixing many more and a few DSO's I knew they were the future in the reliability stakes.


--- Quote ---It's a 2 channel, 5MHz monster from the 80's and is a total nostalgia boost for me.
--- End quote ---
:D
Not sorry to say I gave the CRO bit up completely some 10yrs back when I got a 300 MHz DSO and regrets are none. 
However I do count myself lucky to have been along for the ride with Siglent and 9yrs is too long since I last visited them. However not sure I want nasal passages explored just to get clearance to get on a flight to Shenzhen.  :--

BillyO:

--- Quote from: tautech on September 03, 2023, 04:48:17 am ---Something like the old DP25 used with care can serve you well.

--- End quote ---
It's a bit marginal on the BW, but beyond that they seem to have a lot of interesting products.  However, I don't think they are interested in retail sales.
I guess if I can find another 9999 interested parties we could get a container of them at a reasonable price (maybe a bit of an exaggeration, but maybe not).

But thanks Rob, I appreciate the discourse.

tautech:

--- Quote from: BillyO on September 03, 2023, 05:18:14 am ---
--- Quote from: tautech on September 03, 2023, 04:48:17 am ---Something like the old DP25 used with care can serve you well.

--- End quote ---
It's a bit marginal on the BW, but beyond that they seem to have a lot of interesting products.
--- End quote ---
It will suit most needs.


--- Quote ---However, I don't think they are interested in retail sales.
--- End quote ---
Yes Pintek have minimum buying limits which works fine for us.
They do have a few resellers and have been around for years however mainland Pintech have stolen their designs and customers.

Performa01:

--- Quote from: MarioBros69 on September 02, 2023, 09:15:31 pm ---
--- Quote from: BillyO on September 02, 2023, 07:29:08 pm ---Even if some of this noise is common mode it's still noise being produced by the power supply and in many cases, like where the powered equipment if ground referenced or will be connected to ground referenced equipment, it becomes a factor.  It will even affect circuitry it is attached to through currents created by radiated energy.  I see no reason to ignore it by filtering it out.  :-//

--- End quote ---

Thank you very much for all your posts, they have helped me a lot to understand how difficult it is to measure the ripple of a power supply.

And it leads me to the next reflection, does it make sense to buy an expensive oscilloscope if you are in a noisy environment?

--- End quote ---
The SDS1202X-E is low noise with true 500 µV/div sensitivity. It can't get much better than this, regardless of the price.

No matter how expensive a scope is, it won't help you with the environment. About the only way to get rid of environmental (= common mode) noise is to use differential probes. Even though the active probe support found on the more expensive midrange scopes might encourage the use of such probes, this is not much more than a matter of convenience.

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