Cosmin Iorga's Blog - All Comments

RE: Part 3 – RoadTest Rohde & Schwarz NGL201 Power Supply

DAB — Tue, 06 Sep 2022 18:57:35 GMT

Very good update Cosmin.

RE: Part 3 – RoadTest Rohde & Schwarz NGL201 Power Supply

michaelkellett — Tue, 06 Sep 2022 08:40:23 GMT

Hello Cosmin, thanks for the work you have done.

There is a problem with your pictures - they are far too small I can't read the text on the screenshots even if I load the image into a different application and zoom into it, the information just isn't there.

It would be very good if you would re-post the pictures with much more detail.

I'm not sure that your FPGA based transient test is fair. How much capacitance is there across the power supply ?

On the basis of your tests the PSU grossly fails to meet spec and I find this a little suprising from R & S, especially as much cheaper supplies can do better. It might be worth asking R & S for comment on this - perhaps they could suggest a test method ?

RE: Part 2 – RoadTest Rohde & Schwarz NGL201 Power Supply

DAB — Tue, 30 Aug 2022 19:17:41 GMT

Good interim test report.

RE: Part 2 – RoadTest Rohde & Schwarz NGL201 Power Supply

michaelkellett — Sun, 28 Aug 2022 09:11:18 GMT

Hello Cosmin,

There is a problem with many of your pictures, which are very small even when clicked on.

I can't read most of the screen writing on the scope or psu. I find the best way to get pics onto E14 is to take a photo at around a 2.5Mbyte type compression setting and then post it as .jpg or .png

Your review is interesting.

Using the sourcemeter as a load may not work out well, sourcemeters and electronic loads use their own internal feedback loops which may clash with the feedback loop of the device you are testing. I would use a MOSFET switching a fixed power resistor in and out of ciruit.

Although I have two electronic loads (one cheap, one mid range (Rigol) I found I needed to build a box with relay switched fixed loads and a MOSFET pulser able to witch in a selection of additional loads. I just couldn't get truly reliable test results any other way.

Noise can be very hard to measure with a mains powered digital scope. Many squirt large amounts of RF energy back into the mains via the transformer interwinding capacitance and RF suppression filter. Removing the earth connection may or may not help (but is always unsafe). The only really reliable technique is to use an optically isolated or battery powered scope with a low noise pre-amp and filter.

I keep an ancient 20MHz analogue scope for this purpose but currently it's out of action (having gone noisy itself with mains hum !)

RE: Part 3 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

14rhb — Tue, 05 Sep 2017 15:59:12 GMT

Nice reporting and it looks like a fantstically capable piece of kit.

Wow - the UART capture shot being displayed as hexadecimal values....something I am too often having to work out bit by bit (and hope I've not made a mistake). Same applies for SPI and I2C. Then as the packet size increases you have to start fiddling with the delayed trigger etc.

RE: Part 3 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

DAB — Sun, 03 Sep 2017 18:30:58 GMT

Great report Cosmin.

Well done.

DAB

RE: Part 2 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

DAB — Sat, 02 Sep 2017 18:11:44 GMT

Very good report Cosmin.

You have done a very good job of walking through the capabilities and providing screen shots of the results.

Well done.

DAB

RE: Part 2 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

geralds — Sat, 02 Sep 2017 17:56:40 GMT

Hi,

Nice review! Thanks.

In comparing to the Keysight scopes, well, well....

This scope looks fantastic.

Best Regards,

Gerald

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RE: Part 2 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

jpnbino — Sat, 02 Sep 2017 16:09:06 GMT

Hi Cosmin,

Nice review!

RE: Part 1 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

rich@rohdescopesusa — Tue, 22 Aug 2017 16:47:43 GMT

Hi Cosmin - great part 1! Thanks for taking the time to post it. One quick comment on the probe compensation - there is also a built-in wizard that helps you to get the probes compensated properly. If you go under menu>setup>probe adjust it will walk you through compensating the probes.

Looking forward to more of your review!

Rich

RE: Part 1 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

ciorga — Tue, 22 Aug 2017 04:38:38 GMT

Thank you Joao, DAB, and Wesley for the nice comments. I am glad to see that you liked my blog post. I look forward to exploring the functions of this oscilloscope and posting more messages.

Best Wishes,

Cosmin

RE: Part 1 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

jpnbino — Mon, 21 Aug 2017 18:29:27 GMT

Nice Work, Cosmin

Waiting for more,

João Paulo

RE: Part 1 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

DAB — Sun, 20 Aug 2017 17:32:43 GMT

Great start Cosmin.

I look forward to seeing your future test reports.

DAB

RE: Part 1 - RoadTest Rohde & Schwarz RTB2004 Digital Oscilloscope

gam3t3ch — Sat, 19 Aug 2017 19:37:42 GMT

Great job can't wait to see more.

RE: RoadTest the Advantech PCIE-1816 - Part 3 Signal Generation with Advantech PCIE-1816 DAQ card and DAQNavi software

DAB — Thu, 01 Dec 2016 19:26:18 GMT

Another great Post Cosmin.

Good detail and clear description of the experiment, the measurement and the results.

Well Done.

DAB