Jeremy Harris wrote:Outstanding work, Luke. This will really be a tremendous help when it comes to trying to solve some of the thornier problems we have with driving low resistance, low inductance, motors.
BTW, what's the black rectangular 20uF, 3.4mohm cap? Looks like a pretty good thing to have right on the power bus to me, but that probably means it costs and arm and a leg..............
It looks like the best budget option may be an array of those cheap caps with such a good spec. I reckon distributing the caps all along the power bus has to be a good way to go to try and keep ripple right down.
Tiberius wrote:Yes, well done Luke.
The motor L and R results are particularly useful. Do you know if those models are Y or Delta?
liveforphysics wrote:... the non-linear relationship between the inductance and turn-count (should be X^2 I think?).
Fligh High wrote:Fantastic measuring device. Lfp I hope you will keep showing more examples of whatever that can be measured with this thing ! because it is really interesting.
Do you think it can show differences in induction in layered board / layered busbar design compared to non-layered or doesn't it work like that ?
For some reason I expect to see space-invaders or pacman appearing on that screen !!! It looks so 80's computer like It's already worth having in a glass display for the looks alone .....
liveforphysics wrote:(I've never owned a chair, and this is the first desk/workbench I've ever had in my life. lol I've worked just kneeling on the floor for years).
liveforphysics wrote:If anyone has some litz wire they want measured and quantified for resistance and freq vs linear inductance etc, feel free to send me some, or really any parts you've got that you've not been able to get specs on.
bigmoose wrote:Note enough bench space.... you will fill it by the end of the year!! You must always have 5 sq feet of unused bench space... for safety sake... and so you can buy another instrument!!
bigmoose wrote:Luke, I am biased AGAINST computer connected instrumentation. Sooner or later you goof up or the circuit goofs up. At the voltages we are working with, and with potential ground loop problems, the probability of FUBARing the laptop is just too high in my opinion. The dollar value may be the same, but I have invested way, way too much time in the software, files and system build on my laptop.
bigmoose wrote:That said, I got my HP 3456A voltmeter (6 1/2 digits) for a couple of hundred bucks, and I didn't wait and shop for the best price. All these old HP items have the GPIB bus so you can automate your readings if you want with Labview software, which is what I use.
Also I have secured auction material from these two sites. Trouble is they do not ship. You or someone must go and retrieve it. Most of my power supplies are from these auctions as was my tab spot welder. Statistically 80% work out of the box, 15% need power supply repair, and 5% is totally trashed and fit for the dumpster. You know I'll go and retrieve for you within my driving area.
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