Test Equipment Anonymous (TEA) group therapy thread

[med6753]

Not feeling brave enough to fully series-stack the inverters and run 'em both off a single 36V supply, eh? 

mnem
*Star Wars time*

You can't. The -V in and -V out are common. As soon as I tied -V out of one to +V in of the other....KABOOM 

Do the outputs NEED to be tied together? Each of the LR8s has reference back to its own inverter power supply. Either leg should be floatable. Then you can actually ground the (-) output rail while using a transformer-based power supply.

mnem
Mmmm... floating 500VDC... yummy.  *tzzzzt* 

I dunno, maybe that would work. At this point I would prefer to keep it battery operated. Safer in case something goes fubar.

[mnementh]

Fair enough... and as long as you keep it battery-op; even if it won't produce a stable output, you can always turn it into a neighbor-who-keeps-parking-in-the-wrong-spot educational aid... 

mnem
*tzzzt²*

[LapTop006]

My location is a bit bad for receiving GPS signals:
My apartment is at street level and the GPS antennas are on the window sill of a window that's looking out to the west and onto the street where on the other side (~25m distance) there's an apartment building with 4 floors.
My apartment doesn't have windows to the south or to the north.   

That is far from ideal, maybe you should try to find a way to bring an antenna outside and up, but that could be hard depending on landlord and regulations…

Errrm. The antennas are on the outside window sill. Didn't describe that clearly.
Inside the window it doesn't work at all thanks to energy saving window glass that's metallized to keep the infrared inside.

You have the same problem I have, although I've got mesh screens on my windows and no way to run an antenna outside.

I can sometimes get enough signal to lock a modern GPS receiver, but rarely.

[beanflying]

I can get the trim pots cheap so I'll also order up some 5K trimmers and add 5K fixed in series and see if it makes a difference.

Lower Attached is the divider my HP735A (1V reference) uses might be of interest. Maybe not down to 500 ohms but lower is better.

[mnementh]

How are you going to solder them in close proximity to that thermoplastic? Seems highly unlikely you won't uglify the hell right out of it.

Tacked them together to make them stay in place easier while I work on the strip copper links. So Far So Good

Good work on losing the hairspray. Good squirt and wipe of IPA between prints to keep any skin oils away from the glass and wash it every dozen or so prints just because. Glassy finish and no glue gunk 

Ahhh... so the ring is bigger than the contact circle. I thought it was supposed to drop right on top of them. 

This latest project, I've literally just been knocking the part loose with a 3" razor scraper, do a dry scrape in case of any loose shreds, and then a quick wipe with a paper napkin and start the next one. I don't even touch the glass.

Now about 3/4 thru #8.   

I thought about reslicing to do 4 at once... I have 310x310, so plenty of room. But these are printing so well, and the layer adhesion is just fabulous. I'm afraid that moving from one part to print three others every layer will affect the layer adhesion, and then there's more likelihood of stringing and blobs... no.    I'm fine with letting it chug away one at a time.

mnem
Let the machine do the work. That's what it's there for.

[Specmaster]

Yeh, I think its best to do one at a time, my printer guy did say however that if I needed more knobs for scopes that he could print multiples at a time and therefore the cost would be lower, but they are significantly smaller so there should not be a problem adhesion etc unless he stretched it to far so by the time he came back to the first it gotten to cold to blend in.

[mnementh]

Small objects like knobs are close enough to the heated bed that they stay warm. A 30mm x 130mm tall cylinder, not so much.

Now working on migrating the data off her old desktop... freaking 200GB iTunes folder over USB 2.0. 

At least the new one has USB 3.0 on it. 

mnem
*Less than the sum of my printed parts*

[beanflying]

Mixed bag of results doing multiple prints at a time.

Layer at a time works fairly well on small bits as far as layer adhesion goes but on the larger parts it takes a while to get back to the next layer so the parts are weaker across the layers. Generally faster than one at a time.

Printing one at a time then moving on to the next (top of one back to bed height for the next) is preferable so long as the head doesn't knock over or bump the earlier parts and cause a stepper to lose position It isn't really faster than one at a time but it can mean you set it overnight and print multiples while you sleep but you can wake up to spaghetti too

[Kosmic]

I received another of those brown box today 

Was described by the seller as "It powers on but there is a burning smell very quickly". That's probably why I got a good deal. Anyway, anybody got some spare triax cables ? 

Will soon be able to measure pico amps and Tera Ohms 

[neo]

So what you mean to say is that you've taken up, as a hobby, the fine art of measuring the breadth of a gnat's fart? 

[mnementh]

Now THAT... is some hardcore pulchritude. Can't wait to see it all cleaned up. 

@neo - Not breadth - length and height. Breadth and duration are options that go in those two empty slots. 

mnem
 

[neo]

Now THAT... is some hardcore pulchritude. Can't wait to see it all cleaned up. 

@neo - Not breadth - length and height. Breadth and duration are options that go in those two empty slots. 

mnem
 

 
Thanks for the correction, wouldn't want to look like an idiot when i go trying to be sardonic and acerbic.

[Kosmic]

So what you mean to say is that you've taken up, as a hobby, the fine art of measuring the breadth of a gnat's fart? 

Hehe yeah I don't really have any use for it right now. But electrometer can also be used as a really high impedance voltmeter so that can certainly be useful. Plus I should be entertained for a little while doing the cleanup and repair.

[mnementh]

You're not going to be happy until you can count the electrons going past one by one, are you? 

mnem
Volt-nuttery: Not just a job; an adventure.

[Specmaster]

Small objects like knobs are close enough to the heated bed that they stay warm. A 30mm x 130mm tall cylinder, not so much.

Now working on migrating the data off her old desktop... freaking 200GB iTunes folder over USB 2.0. 

At least the new one has USB 3.0 on it. 

mnem
*Less than the sum of my printed parts*

ITunes is freaking slow regardless of USB2 or USB3 because it has so many files to album  And it is even slower to copy over to a NAS drive as well 

[Mr. Scram]

I pretty much ran out of reasons to buy multimeters for myself, so I simply started buying them for others. It feels good doing things for others. That some real alteaism. Proper charitea.

Not that we need reasons, mind.

[Specmaster]

You're not going to be happy until you can count the electrons going past one by one, are you? 

mnem
Volt-nuttery: Not just a job; an adventure.

Not just counting the electrons, but grading and numbering them as well. 

[Kosmic]

You're not going to be happy until you can count the electrons going past one by one, are you? 

mnem
Volt-nuttery: Not just a job; an adventure.

Nah i'm just a wanabee voltnut. Not sure I will ever get there. It's a fun trip though 

[Brumby]

You're not going to be happy until you can count the electrons going past one by one, are you? 

mnem
Volt-nuttery: Not just a job; an adventure.

Not just counting the electrons, but grading and numbering them as well. 

Could be a quick exercise....

[Mr. Scram]

Could be a quick exercise....

"You may be technically correct. The best kind of correct."

[Kosmic]

Talking about volt-nuttery, I'm currently benchmarking different solder wires and recording the EMF generated when coupled to copper. Recording on my Keithley 181 is a pain so got to finish writing another software before I get some real results.

But 10Sn90Pb seem really good when compared to Sn62/Pb36/Ag02.

[Kosmic]

I pretty much ran out of reasons to buy multimeters for myself, so I simply started buying them for others. It feels good doing things for others. That some real alteaism. Proper charitea.

Not that we need reasons, mind.

Good idea! Valentine's Day is coming, I could buy one for my wife. 

[Mr. Scram]

Good idea! Valentine's Day is coming, I could buy one for my wife. 

A bouquet of Brymens should go over well.

[Kosmic]

Good idea! Valentine's Day is coming, I could buy one for my wife. 

A bouquet of Brymens should go over well.

hehe good one 

[Brumby]

Oh - the myriad of hellish reactions such a move on my part would bring to the fore.

I'm going to have to go into hiding for three days for just reading that.