The Great Circuit Challenge!

cowboybob said:

At the moment, I'm hard pressed to think of any analog device that can't be replaced with some manner of digital gizmo, other than an amplifier...

Click to expand...

tcmtech said:

I ran into that problem when I was in oil field a lot. The company I worked for used ethernet based interconnections for everything between the data van control centers and everything else and our longest ethernet cords were 200 feet. Problem was that for a few of our higher data bandwidth pieces of equipment they worked on a 200 foot interconnect lineset just fine in a singular 1 - 1 connection but if the site got set up wrong even adding even a 25 foot extension to its 200 foot cordset made that whole machine drop out of the network and refuse to talk to everything else yet still pass a connection ping test from every point in the system every time.

The only cheat was to daisy chain that unit through a midpoint machines systems 1 - 1 - 1 and have it work as a passthrough router of sorts assuming it plus the remote machines combined data rates did not then over load its connection bandwidth limits to the main data van systems, which most did, given the type of ruggedized industrial ethernet cord sets we used had terrible data rate capacity numbers. You could pull a small car with one but you couldn't expect much over 50 - 100K data rates at 200 feet and no amount of software would change that limit.

Analog reality choked the life out of digital function every time and very few understood why. I didn't and I chased that ghost for the better part of day before I finally got a explanation for it. Cord bandwidth Vs machine connection bandwidth requirements at a distance didn't add up.

Click to expand...

unclejed613 said:

the purpose of using an LVDT is to keep the sensor centered, and so you need a directional component in the signal to sense what direction the error is in.

Click to expand...