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I am a relatively new hire to a small aerospace company as well. I do mostly automation design, but here are a few links to resources I like to use. https://www.automationdirect.com/adc/Home/Home https://www.mcmaster.com/ http://www.sdp-si.com/ https://www.carrlane.com/en-us/...

Related, my back is getting chaffed from rubbing in the chair and shocking myself so many times, is there a more repeatable way to create the ESD then wiggling in the chair and touching it?

I tried the ground plane without success. I was unable to implement the one common ground point so I did not try that, but it seemed like it might have gotten worse when I used caps between the sheet and gnd and when I just connected each bus to it directly. I have recreated the issue using an...

Link this is the link to the chip i'm using's datasheet. The schematic was what was originally on my printed circuit board before i started protoboarding it to make the changes I thought would fix the problem, hence the differences. also I just reread your last comment: I don't want the...

It could be that the schematic has a slightly different chip package than the breadboard. I ran out of the other chip package so I have been testing with the C version.

@MacGyver How do you measure ground? I was having trouble with this as I need some stable reference to measure it relative to correct? I tried running an extension cord to another farther away socket and still got garbage when using the oscilloscopes GND vs the boards GND. @itsmoked The...

@Benta I have tried to figure out if I should connect the neutral on the 24VDC PSU to the AC earth ground, and I have found mixed advise on it. I could try to float the 24VDC by just disconnecting it from earth ground. Would I connect the 5VDC Ground to 24VDC ground? Also is the protective...

So I tried a low pass filter with a 1kohm resistor and a 1nf, 2.2nf, and then a .1uf cap with the issue still being reproduced. I started a decade away from my measured frequency which was 1/600ns or 1.66MHz. My caps are through hole, so I got them as close as I could using the solder-less...

@VE1BLL Yes. Neither the chair nor the person is touching anything other than each other or the ground which is non-conductive. @djs I think I had an RC filter at some point as I stated in the original post "I have put a resistor and caps between the 5V and CLR pin and CLR pin and GND...

So recently due to the low temperatures and in turn the low humidity I have been seeing this weird thing where if you wiggle too much in a chair near the circuit-board and power system I have been working on, then stand up, you create a pulse in the ground of the system which is strong enough to...

Model Based Definition?

I am pretty sure that you are missing information about size tolerances of each component part depending on what stack-up you want to figure out. Can you provide more info?

We do residual stress analysis. I would say that usually the strain indicator doesn't fluctuate more than 1 micro-strain in the reading once the part has settled in a temperature controlled room. If you want a readout frequency of 400Hz though I would look elsewhere than the P3 as I think it...

My company does a lot of reading in of strain gauges. we use the P3 strain indicator from Vishay/Micro-measurements. Honestly working with Vishay is a pain because of their ridiculous lead times, but their products seem good. The P3 is DC voltage and we can read consistently down to a...

Relating to Pylfrm and 3DDave's comments. Is this an acceptable thing to do? I am at a small company, so I do the QC as well as the drawings, I would much rather have something easy to QC. Parallel implies parallel and planar correct?

So Something more like this? The Profile Dimensions the first slot where the datums as well as loosely dimensioning the other slot are and the parallel and perpendicular are used to refine the other slot relative to the datums? I assume I would check the parallel and perpendicular callouts...

Assuming I have a double V block part as shown below, and the design intent is to keep the axis of the two imaginary cylinders lying in the part parallel and in the same plane, what is the best way to do this? I have some ideas as to how to make this happen (below), but I am unsure as to how...

I am looking at a drawing made by a US company in 1975. I cant find a reference to any drawing standard. there is a note regarding flatness that reads as follows: "DEVIATION FROM VERT TO BE WITHIN .005 TOTAL FLATNESS. TOL FOR SURFACE [a bunch of surfaces] TO BE WITHIN .002 TOTAL (MAX .0002...

If you have a blind hole and specify a press fit dowel pin but no depth, is it assumed that the pin should be pressed in until it reaches the holes depth? What if there is a through hole, is the pin assumed to be pressed flush relative to the surface containing the note if there is no specified...

So the way it is now, it is sort of defined by polar cylindrical coordinates? There is a tolerance zone 4 thou in diameter located at the exact location of the intended points? What defines the zero orientation for the 45degree angle? is it the same thing?