I absolutely love your channel! I just stumbled across it, and I can’t believe I haven’t seen it before. I’m on RUclips about 12 hours a day streaming it in my electronics lab. It’s nice to have fellow electronics enthusiasts and professionals to listen to while working. So I’m stunned I haven’t seen your videos before. I love electronics channels, and especially those who work on a lot of test equipment!!!! I enjoy all of the big electronics channels… But my main complaint is they don’t focus enough on test equipment. Take big Clive for example. He does all kind of cool tear downs and stuff but damn I think he’s only made two or three videos in the last 10 years regarding test equipment or tools. Love your channel!
It would be really great to see you build the other DIY metrology projects from those old articles. RUclips has a huge lack of DIY metrology stuff that’s somewhat affordable. Don’t get me wrong I love XDEVS, Marco reps, and the LTZ1000. I’ve even built a few of them. But most of those nicer projects are financially unobtainable to the majority
You will likely come up against the op amp offset error at those very low voltages, you might find it to be as high as a few mV, or as good as a few uV, (I haven’t looked the data sheet up for your part)
Even an ovenized and aged LM386 can do OK at 10uV DC - just gotta trim the offset out. The modern op-amps got it blown out of the water, even cheap ones. Static offset is not a concern what matters is temperature drift and long term drift.
I use Rhinoceros 3D for all my 2D/3D modelling, but any software that lets you draw a design to scale and output a DXF file will work (Sometimes I use Adobe Illustrator to clean things up a bit too). Then I use Diptrace for the PCB design to import the DXF and turn it into a PCB, but any PCB software that can import a DXF will work here too. I usually build the case and basic component layout for things like switches and connectors in the 3D software, then use that design to place things correctly on the PCB, go back and forth iterating a few times until everything fits and you end up with a nice design that hopefully all fits together perfectly. :)
I'm very interested in building this. Unable to find a case that matches yours... Many close, but no match. I would like to take advantage of the excellent engineering that you demonstrate here. I see that the main board is 100mm X 116mm, and that the front panel is 44mm X 112mm. Sorry to ask for more after you have already put so much into this, but what is the model and make? Thx.
@@NearFarMedia Thanks for the reply. That helps! Although I can't buy that particular enclosure for a reasonable price here (North Carolina, USA), I can easily find the complete specs and duplicate them. Thanks also for going into the details of your design process. Lots of good, solid principles and techniques that can apply to any project. I have been very interested in Conrad Hoffman's three "Mini Metrology Lab" projects was curious how others might vary or update the componentry. I came to this video through the EEVBlog conversation which is also very instructive.
!["GREAT" Meter! The HP 419A DC Null Voltmeter, [RESTORATION]](http://i.ytimg.com/vi/vrmwql2msbU/mqdefault.jpg)
!["GREAT" Meter! The HP 419A DC Null Voltmeter, [RESTORATION]](/img/tr.png)
Really nice design. I'm a big fan of PCB front panels 👍👍
Nice design! thanks for a great presentation.
I absolutely love your channel! I just stumbled across it, and I can’t believe I haven’t seen it before. I’m on RUclips about 12 hours a day streaming it in my electronics lab. It’s nice to have fellow electronics enthusiasts and professionals to listen to while working. So I’m stunned I haven’t seen your videos before.
I love electronics channels, and especially those who work on a lot of test equipment!!!!
I enjoy all of the big electronics channels… But my main complaint is they don’t focus enough on test equipment. Take big Clive for example. He does all kind of cool tear downs and stuff but damn I think he’s only made two or three videos in the last 10 years regarding test equipment or tools.
Love your channel!
It would be really great to see you build the other DIY metrology projects from those old articles.
RUclips has a huge lack of DIY metrology stuff that’s somewhat affordable. Don’t get me wrong I love XDEVS, Marco reps, and the LTZ1000. I’ve even built a few of them. But most of those nicer projects are financially unobtainable to the majority
I also love using PCB front panels, it look great ! fantastic tutorial...cheers.
Muito bom, eu das suas explicações.
FEAR brought me here for the blue vein vector
You will likely come up against the op amp offset error at those very low voltages, you might find it to be as high as a few mV, or as good as a few uV, (I haven’t looked the data sheet up for your part)
Even an ovenized and aged LM386 can do OK at 10uV DC - just gotta trim the offset out. The modern op-amps got it blown out of the water, even cheap ones. Static offset is not a concern what matters is temperature drift and long term drift.
Geat video!
Aren't the two diodes for overload protection to limit the maximum difference to .6 to .7 of a volt. Voltage drop of the diode?
So it is not inteligency metrology device then? Oh well.. btw, is the front panel a PCB? It looks great!
Hi love the video, what I really would like to know is what software you use to combine the case on the PCB thanks
I use Rhinoceros 3D for all my 2D/3D modelling, but any software that lets you draw a design to scale and output a DXF file will work (Sometimes I use Adobe Illustrator to clean things up a bit too).
Then I use Diptrace for the PCB design to import the DXF and turn it into a PCB, but any PCB software that can import a DXF will work here too.
I usually build the case and basic component layout for things like switches and connectors in the 3D software, then use that design to place things correctly on the PCB, go back and forth iterating a few times until everything fits and you end up with a nice design that hopefully all fits together perfectly. :)
I'm very interested in building this. Unable to find a case that matches yours... Many close, but no match. I would like to take advantage of the excellent engineering that you demonstrate here. I see that the main board is 100mm X 116mm, and that the front panel is 44mm X 112mm. Sorry to ask for more after you have already put so much into this, but what is the model and make? Thx.
The enclosure is a Takachi brand, part number HEN110412, easily available here in Japan, but I'm not sure about availability in other countries sorry.
@@NearFarMedia Thanks for the reply. That helps! Although I can't buy that particular enclosure for a reasonable price here (North Carolina, USA), I can easily find the complete specs and duplicate them. Thanks also for going into the details of your design process. Lots of good, solid principles and techniques that can apply to any project.
I have been very interested in Conrad Hoffman's three "Mini Metrology Lab" projects was curious how others might vary or update the componentry. I came to this video through the EEVBlog conversation which is also very instructive.
Stepped attenuator.... that's what the funny pot is called.