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Test Equipment / Re: Magnova oscilloscope
« Last post by LoneWolf6912 on Today at 01:19:10 pm »
Hello,

I haven't received my personal unit yet, but I’ve already had the chance to use one at work.

Unfortunately, I can’t take any photos because the Magnova is connected to an experimental plasma machine under an NDA.

That being said, my first impressions are very positive. The display is stunning, and the user interface is extremely responsive. The FFT is fast, even faster than our Tektronix MSO3 that we already have in the lab. Regarding trace thickness, I didn’t encounter the issue previously mentioned—traces are fine, as expected from a reputable oscilloscope brand.

However, a few remarks: the oscilloscope allows zooming down to a few picoseconds per division, which is a bit excessive for a device in this frequency range. It doesn’t have any practical physical relevance.

The probe ports seem designed for active probes, but nothing in the menus currently supports their full use. I wasn’t bothered by the side-mounted probe setup either.

You can switch between a dark mode and a light mode, which is always nice. However, Batronix currently doesn’t provide a platform to retrieve firmware updates, which is an area for improvement.

Personally, I had no issues using this device. Even though it's somewhat different from a classic oscilloscope, everything remains very intuitive.

A particularly appreciated feature: the ability to display measurements directly on the traces. This is a real plus, especially in a professional context where you may need to present results to people with diverse scientific backgrounds.

The statistics function is also a great addition. While the numerical values are the most useful, seeing the variation on a graph is a real bonus. As for the math functions, they cover a wide range of logical and mathematical operators. However, some functions are still missing, such as the absolute value, for instance.

Having experience purchasing scientific equipment, I can confidently say that, in this price range (with the current promotion), the Magnova offers more than any other oscilloscope. I’m very happy with my purchase and hope Batronix will provide regular updates to improve the software.

A few improvements would be welcome, such as the ability to split the screen for each channel or to adjust the font size. One of my colleagues, in his fifties, had difficulty reading the X and Y axis divisions.

Moreover, the arbitrary waveform generator accessory won’t be delivered until next May, so no Bode plot function until then.

It's worth noting that I’ve been using this oscilloscope in a physics research context, not purely for electronics.
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Quote
It really is a testiment to the ease of use of cortex mcus that some folks get as far as they do with minimal reading and learning effort.

The Q I would ask is why is this feature needed?

I come from decades of doing assembler (Z80 onwards) and one just treats things literally.

But if

Quote
On a STM32G0xx the vector table must be at 00000000

then I can see the need for this, but why put the vector table at 0 in the first place?
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Maybe a pool/hot tub store? Where I'm from I've never seen it in a hardware store in anything but gallon jugs labeled "muriatic" for etching concrete and pool pH adjustment.
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Perfect, you were very clear, thank you very much.  :-+

Later I could also take a different handle, they recommended the blue P9 to me, the grip is closer to the tip, the 907 handle seems wider but it has a metal ring to block the tip, perhaps it is more resistant, in the end the important factor is compatibility, at the beginning I thought they were all the same instead the quicko has the 5-pin connector, among other things there is not even a compatibility of handles between the KSGER and the Quicko.

Of course with all these versions of KSGER 942/951/952/956/958 you have to be careful about the compatibility of the handles.

I looked at the various handles of the Quicko 958 to realize the differences.

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RF, Microwave, Ham Radio / Re: VNA for cable characterization
« Last post by Pinörkel on Today at 01:12:14 pm »
Next I measured the insertion loss of a few cables.  Their lengths were also noted along with the connector brand (if known).   

At 1GHz its 14.7dB for 100' or 0.91dB for our 74inches.  Which is very close to what we measured with the added loss of our adapters and connectors.
So it seems like the liteVNA can produce some usable quantitative results.

I tried to reproduce your insertion loss measurement with my test setup. The liteVNA was warmed up one hour, and then calibrated with the supplied cables and standards from 100k-6.3G, 1kHz IFBW, ideal model. I did not go all the way up to 9G, because I stumbled upon a strange calibration artifact, which I will try to show later. Then, I connected one of my cheap SMA-M to BNC-F adapters to the double SMA-F adapter at the cable on port 1 and a SMA-F to BNC-F adapter to the cable at port 2. The DUT cables then went in-between the BNC-F adapters.

2379433-0

As cables, I had:
RG58 C/U MIL C17F, 107 cm
Datasheet: 1GHz  51.8 dB Attenuation dB/100m -> for 107 cm : 0.55426 dB

Belden H155, 91.7 cm
Datasheet: 1GHz  29.6 dB Attenuation dB/100m -> for 91.7 cm : 0.271432 dB

This is what I got:

2379429-1

The image shows two measurements for each cable in the 100k to 1G range. One measured with 801 points from 100k to 6.3G and one with 801 points from 100k to 1G. The one with the denser sampling showed a large peak at the beginning going up to about 5.2, a strange small disturbance at 100MHz (which stays there, even when varying the sweep parameters) and some periodic superimposed oscillation. Unfortunately, the measured insertion loss values are not even close to the theoretical values I listed above. Maybe I messed up something with my measurement setup or my SMA to BNC adapters are too bad. At the moment, I do not have sufficient materials to test the insertion loss of only the adapters.


I also got myself some PCB mount BNC-M connectors to experiment with building BNC calibration standards, like described here. It seems those are only available from china manufacturers and no known quality manufacturer makes those. The first try was a complete and perfect failure.  8) The springy outer conductor of the connectors is too small in diameter by about .3mm and does not make good contact to any mating BNC-F connector. So, the connectors themselves are really bad. Nonetheless, I created an open and short by filing down the center conductor and then soldering a small tinned copper disk for the short, just for the fun of it. The result was smith chart that looks like Indiana Jones whip after calibrating. For open, short and load (even below 1GHz) the smith chart does not even get close to where it is supposed to be and jumps all over the place when just looking at the connector. I really wonder how the guy from the website linked above managed to get anything out of these connectors, but it may also well be my soldering skills.
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Recently, YouTube has started sending a lot of unnecessary requests to various tracking sites like play.google.com. Interestingly, this coincided with discussions about the enforced throttling of YouTube based on the country. It seems that YouTube has finally degraded into an advertising dump filled with gigabytes of tracking and other useless junk.

I blocked most of these requests, but it spamming firefox console with error log messages and keeping youtube page opened for a long time leads to a huge memory leak...

I also have playback freeze issues with some videos. I suspect it may be due to a blocked ad. However, I will not remove my ad blocker, even if they stop playing videos without ads. If they do that, I will just stop using YouTube.
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In many cases there are plenty of components that are not mounted on a PCB but these are nevertheless important parts of the device. I always include these in the schematic and tend to foresee some connector on the PCB to wire them in. This way these are also included in the BoM.

Some common examples: A fuse in a chassis mounted holder; Power cord receptacles with or without build-in filtering; Switches and potentiometers; all sorts of input-output connectors.

How do you annotate these in your schematic?
Are you only using the "Exclude from board" attribute?
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General Technical Chat / Re: Samsung throwing the towel in Texas??
« Last post by Marco on Today at 01:05:21 pm »
It seems unlikely that others have poor yields because of EUV itself. Its much more likely they have quirky processes at the fine geometries where they are using EUV, and TSMC has their's running sweetly.
It's not like multipatterning was straightforward, yet they could compete much better.

TSMC was the first to use pellicles and still uses its own in house pellicles, I think they have some fundamental trade secrets in there. Even though pellicles are out of the focal plane, deformation will distort the projected image, they can cause yield problems even when they stop the contamination.

TSMC's fab in Arizona is doing just fine ... Arizona ...
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Projects, Designs, and Technical Stuff / Re: Hakko FR-301 Question
« Last post by bostonman on Today at 01:04:52 pm »
Quote
HI, I purchased a Hakko FR-301 Japanese version (I'm in the US) and performed the conversion of removing the 10 Ohm resistor and replacing it with 2 300 Ohm resistors.

I have the same unit and others stated this conversion isn't necessary, so I never performed it.
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General Technical Chat / Re: What do you WANT to buy?
« Last post by NiHaoMike on Today at 01:01:09 pm »
A new GPU with plenty of VRAM that's not insanely overpriced.
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