Calling jneutron, EVA. SY, precision high power resistor

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#24
Thanks!

There are a few of you I would let have a try...

On the other hand... it would be nice if we engineers could lay parts next to each other and come back in a week to find them grown together. Fix blown transistors by turning them off for a few weeks!

Eva... don't forget the private email... we have some business...

Poo
 
#26
When I did Audio/Video at the Cleveland Clinic Seminar's. One Doctor showed photos of a patient, bear hunting and hauling the bear back to the car, one week after back surgery! My next door neighbor works in back surgery, she hooks an oscilloscope up to the person's spinal cord (I think) and lets the Doctor know when he does something wrong.
 
#27
OK...

So I'm alive... legs are better already... back hurts like **** though!

I have some funny stories... not now... too doped up.

Conrad and John

What about soldering this manganin stuff? Any thing I should know?

Thanks for all the good wishes... you can go back to be snotty now.

Kevin,

I did not have the SCOPE for this operation... but I did for the operation I had in '96... pretty cool.
 
#28
Hey Poobah, glad to hear you're on the road to recovery!

Manganin doesn't solder as easily as copper, but it does solder. IMO, that's the main reason for using it over one of the alloys like RO-800. They seem to have slightly better properties, but have to be welded- can't be soldered at all. For my Manganin I just use ordinary 63/37 or 60/40 containing RMA flux. There may be better choices, but that seems adequate.
 
#30
Thanks burnt...

Actually Conrad... from what I can find out... if you can manage to keep the temp within 10 to 40 C (and I will) manganin tromps EVANR (800)

I think it is 2 ppm over that range...

I try the eutectic and see how it goes.



🙂
 
#31
jneutron said:


Whoa. Good luck.

Cheers, John
Click to expand...
Good luck with the disc poobah.

My 'not fully educated on the specific subject' thoughts would be the calculation of the calorimetric loss in the fluid vis-vis thermal transfer issues. That can only be approximated so much, is my conclusion. And if you are that critical and that close, it's gonna play at the heart of what you are trying to get to, ie, accuracy. But I'm sure you are well aware of all this anyway.

oh..I see the disc is gone. I guess the best you can hope for in the long run is having only funny stories and and a battle scar.
 
#32
Thanks KBK, feeling better today already!

Actually the disc isn't gone... the disc is still quite thick and robust. All that is gone is the portion that tried to invade the spinal canal.

I've had 3 bad discs... out of 360 degress to protrude... each one has decided to head right for the spinal cord!

Yep... calimetry is a pain... I do it on some stuff... but it just a pain. Stray heat loss, parasistic/assorted heat capacities, and test time, just make it a PITA... pure and simple.
 
#33
Good to see you're back. Glad it went well.

poobah said:
What about soldering this manganin stuff? Any thing I should know?
Click to expand...

Try using plumbing flux to coat the wire end. Not the kind of stuff you'd want to use for normal wires, but corrosive enough that it just might work.

You can also try stainless flux. I use it for soldering to nichrome as well as stainless steel. Takes some technique, but I get a really good coat of solder on both. Once you've coated the wire, you can easily solder the coated section. (do a good cleaning after you've coated the wire though, before the final solder.)


poobah said:
Yep... calimetry is a pain... I do it on some stuff... but it just a pain. Stray heat loss, parasistic/assorted heat capacities, and test time, just make it a PITA... pure and simple.
Click to expand...

If it is really 101%, then all you have to do is immerse the unit and run it for a while...When the water starts freezing, voila...

Cheers, John
 
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