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Microwave owen transformer spot welder?
PekkaNF:
Thank you very much. I heard good stuff on Sigilent stuff, but one person warned me stay clear of http://www.siglent.eu/ site. He had trouble with that and does not show on sigilent page either.
Those handheld seems "perfect" but price is least doble on what I am prepared to spend at this point.
Some have recommended USB scopes like this:
http://www.ebay.com/itm/Hantek-6022BE-PC-Based-USB-Digital-Storage-Oscilloscope-20MHz-Bandwidth-48MSa-s-/331245851756?hash=item4d1fca946c:g:kaAAAOSwGiRTrT9N
But they will need a laptop, not sure if measurement is isolated from the laptop and where they are grounded or nulled.
Pretty ideal would be two channell benctop, simple triggering and with 1:10 attennuated probes I should be able to measure all threepahse stuff. It just looks like just might get that about 200€, but really should shell out least 100€ more to actually get the spec and usability.
I tried long time ago some of the first handheld scopes and they were damn too difficult to use and so limited that you actually had to know the wafeform and fiddle trough all menus and then you had to figure from few dot's on the screen that yup, subber is duff.....
Is there simple and easy to use benchtop type on very low end price range, or am I better off with USB cacadoodles and when I throw one trough window out of frustration I'll just swallow and prepare to spend 300€ on something that is nearly enough.
Pekka
PK:
We have a couple of PC based test tools. The purist in me says they are an elegant and cost effective solution. I mean why pay for a screen on every single instrument when you can just use a laptop? In practice I find myself preferring the stand alone gear.. Go figure!
So these are very good value for money http://www.emona.com.au/products/electronic-test-measure/oscilloscopes/ds1054z.html#.Vo0XjxV95hE, big screen 12 million points capture buffer (trust me, this is an important spec) and peanut cost.
They get even better when you unlock the 100MHz bandwidth with a simple hack http://hackaday.com/2014/11/12/how-to-get-50-more-zed-from-your-rigol-ds1054z
PK
PekkaNF:
After lengthy negotiations with her royal highness I have legitimate fund for a new toy....but nowhee close to anything like 500€ or any other that type of figure.
Rigol DS1052E starts to look like possible canditate, but where to get it in Europe?
Is it allways same or are there different versions floating?
Found these:
http://www.batronix.com/shop/oscilloscopes/Rigol-DS1052E.html
http://www.rigol.eu/products/digital-oscilloscopes/ds1000e/ds1052e/
http://www.rigol-uk.co.uk/Rigol-DS1052E-Digital-Oscilloscope-p/ds1052e.htm#.Vo6sGVl8dzk
Anything else I should know before.
Pekka
PekkaNF:
Got one old UK-made 10MHz scope for free and nearly fried it today....
Got some measurements done. Have to dig up and connect my isolation transformer somewhere.
Have to get some probes and acessories.
Any good tutorial on AC power circuitry measurement. Figured I'm a bit rusty. Too long time from studies.
Pekka
PK:
Like I said, hand held, isolated scopes are nice things in some applications.
All you really need to keep burned into your consciousness is that the little croc clip on the scope probe is connected to the earth and neutral wires in the plug.
If you can get your head around that then everything else becomes obvious.
The normal procedure is to plug the DUT (in your case your spot welder) into an isolation transformer. This lets it float with respect to ground and means that you have to touch two points on it to die instead of one.
Catch is, an isolation transformer that can handle the power your welder should draw are big and expensive. (maybe you could get two more MOT's and wire them back to back??)
So what you would probably do is plug the scope into an isolation transformer and float it WRT ground. NB, this is QUITE A LOT MORE DANGEROUS because the case of the scope including the front panel (do the knobs on the front have metal grub screws in them that your fingers may touch when you adjust the settings?) will sit at whatever voltage you connect the earth clip to....
Having said that, there's no reason not to do this, just plan ahead and write a short note bequeathing all your tools to me in the event of your death.
I have a bit of a process I like to follow when I work on high voltage stuff I'm not confident with. I take a digital multimeter set to AC volts and hold one lead. Then I poke the other lead onto whatever bit of metal I'm thinking about touching. If I see more than 20VAC on the meter then I know I've just avoided electrocution. It's not a fool proof process, but I'm still here..
Oh, and RCD's are a MUST HAVE for this kind of work..
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