Видео

I don't use this meter very often. If I know I am going to be using it, I plug it in the night before and let it charge overnight. It is done when I get up. Eventually the battery will need replacing.

I assume what ever it was originally, or it would have thrown the OEM's alignment.

@@joesmith-je3tq Но вы же меняли детали,в том числе переменный резистор,неужели после замены вы не настраивали переменый резистор по эталонному напряжению?

@@user-mi8so5fj1v Yes and I would have set it back to the same value I read before the modifications.

Sadly you completely missed the point that there is no one right solution. I too am disappointed.

Yes, 115 is older.

Video is now 7 years old. You would need to provide me with a time stamp.

@@joesmith-je3tq на 33.56 вы говорите что установили два последовательных резистора по 500 килоом,почему два последовательно,а не один на 1 мегаом?

@@user-mi8so5fj1v It is possible that I did not have a 1M on-hand, or I wanted to give it a better chance to survive the ESD event. Possibly both. It's also possible that mechanically to fit the parts, I used it to get a longer length. As the video mentions, the goal is not to give the kids something they would cut and paste. It is more just going over some of the basic steps involved. The mods I show are for educational purposes only. I would never suggest anyone modify any safety related product.

@@joesmith-je3tq спасибо за ответ Джо.Я использую этот мультиметр только в низковольтных цепях,в своём хобби,просто хотел немного его улучшить в плане защиты.Вам огромное спасибо за полезную информацию.

@@user-mi8so5fj1v Rather than wasting time, most likely causing more harm than good to your tools, I suggest buy tools that meet your needs. The meter shown in this video is clearly marked so if it somehow ended up in someone else's hands, they would know not to ever use it. My plan is to destroy all of the meters I modified to avoid this potential scenario.

Sounds like you are asking about making new scales for the two gauges. That is certainly possible.

@@joesmith-je3tq scale will be ready by then added to the cluster. So at Yours ground will be only to program.

@@dominikbratko7646 It wouldn't help you with the tach but there was a company who sold a small box that sat between the pickup and head to allow you to use different sprockets. I wonder if they allowed for that high of MPH. It may be easier to get an aftermarket cluster.

I am not sure what you mean. Assuming you are using the latest version of Solver64, if you select the Setup/Diagnostics, to the center right there is something called Point Index. This is incremented on every sample received. SweepTime is how long it took to measure the entire sweep. I've not ran into it hanging but it's certainly possible you have uncovered a problem. You would need to provide more details about what you are seeing.

There is a link to a thread I started on the EEVBLOG site. If you decide to provide further details about the problems you are seeing, feel free to post them there. I am in the middle of making changes to this software for an experiment I want to run, so this would be a good time to change it or fix any problem you may have found.

I was referring to the leads, not the wire. Their is a separate standard for them, just like the safety standards for the meters.

I'd imagine it should have evaporated at that voltage and if the source was low enough impedance (high energy). It's interesting that it didn't, even despite there's no HRC fuse (or any fuse for that matter) in the voltage input path.

Pretty amazing, because at 40+KV, you would figure that any arc that started would continue to just burn and irrepairably damage the meter's innards. That kind of voltage would most likely easily jump and sustain a 2 inch gap once an arc is started.

@@poormanselectronicsbench2021 I work behind an adjustable over current protection circuit and a big red kill switch just in case. So it can not continue otherwise the meter maybe would have been in worse shape. ( trace between input and MOVs burned away)

@@pa4tim The only time I work with voltages that high are involving automotive ignition systems. There isn't enough energy to make a DMM explode. It could certainly damage one.

Maybe a backpack car battery might do better :) .seriously though, I am impressed such a probe exists, but does it cost less than a house?

It is not an insignificant current draw, but the battery life is still reasonable if you remember to switch it off after using it. Replacing the 9V with a litium battery or other floating supply is also an option.

@@stevenbliss989 It does cost quite a bit less than a house. Around $225.

@@LasmuxDevices A floating (VERY HIGH & LOW CAPACITANCE ISOLATION) supply would be good, and if I ever need this probe I could build one.

@@LasmuxDevices It is for a 9V battery. Lithium might do better, although with the smaller cell inside the pack, along with a boost converter, might not be so much.

Not that I am aware of but mine are now fairly old. Download and read the latest manual for up to date info, or contact the manufacture.

Being it was seven years ago, I would be guessing. Judging by the package size, appears to be X7R. I would expect COH/NPO to be much larger. From the video, keep in mind there is no once size fits all. You will need a thermal chamber to compensate one. Still, those values may make a good starting point. Good luck.

@@joesmith-je3tq благодарю,жду когда приедут детали.

A VNA presents very low power.

I don't have a lot of interest in radio and don't hold a amateur radio license. That said, they do use 10GHz and I would guess some of the amateur radio YT'ers would be more than willing to put together a review for you. Wouldn't hurt to ask them.

Look at old photos of Marconi's station in Kahuku Oahu to get an idea of what it took to reach the end of the world. It's amazing how far mankind developed this technology in a such a short time span. Also how so many other areas of technology fed into that, like space flight for example. I posted some screen shots showing a gap cycle time of 40kHz using this ignition coil. That was the fastest I was able to achieve.

@@joesmith-je3tq Yes. Very large antennas are required. However, the Chaffee gap consists of trains of damped waves that meet each other in the correct phase in the 2nd or 3rd cycle. Practically they are very close to the continuous wave. They can also operate up to 15 MHz. Maybe you know. Even a small improvement like Telefunken's multi-plate discharge gap provided a huge increase in range and allowed for sharper tuning. Proper grounding and inductive coupling also serve these purposes. Given the quality and accessibility of today's materials and the advances that have been made in physics, I am hopeful that an acceptable transmitter can emerge, based on this technology.

@@AlexBurtonMusic If you decide to post about it, provide a link. Or, feel free to use the one I provided on the EEVBLOG.

@@joesmith-je3tq Of course. I would love to share it when I complete my project. Thanks.

You may have noticed it also started glow right after resetting.

If you decide to post about it, provide a link so we can have a look. If you would like to see the last transmitter I constructed in operation, check out the following: ruclips.net/video/IxLXQdFiYtI/видео.html

RUclips comments is a poor platform to start such a conversation. If you want the world to comment, consider creating an account on EEVBLOG or other forum. Start a new topic and provide me with a link and we can get started.

Are you asking about the aerial current?

Which is a old meter marked "Signal Strength"

@@joesmith-je3tq yeah

@@alphaindustries5775 Transformer coupled, diode to rectify the signal, cap for filtering, trim pot to set the sensitivity and a meter. Because I am really only looking for a relative measurement in a very narrow range, the circuit can be pretty crude.

I would need to scan it. Guessing the manufacture has it on their website.

It's great for working above 300MHz, but for narrow band, low frequency work, the original NanoVNA will out perform it. They are cheap, so it's no big deal to get both.

@@joesmith-je3tq 900mhz is the frequency I need specifically, for LoRa networking, but I also want to do some 2.4ghz long range stuff down the road. Figured this was the best device in my budget, although the original NanoVNA was very tempting given the price.

@@steve_seguin The original NanoVNA has poor performance above 300MHz where it uses harmonics. I was surprised when the software was changed to support >900MHz. The LiteVNA is a much better choice. There is also the open sourced LibreVNA. I understand it is a full 2-port VNA but I have never looked into it.

@@joesmith-je3tq I value your insights; thank you