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Author Topic: Oscilloscope hooked to SSG ?  (Read 7729 times)

prometei

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Oscilloscope hooked to SSG ?
« on: November 30, 2008, 04:13:33 AM »
HI ever1. I've bought an oscilloscope and was wondering how does one hook it up to a Bedini SSG circuit?

WilbyInebriated

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Re: Oscilloscope hooked to SSG ?
« Reply #1 on: November 30, 2008, 06:38:53 AM »
just connect the scope to one of your coil windings.

TinselKoala

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Re: Oscilloscope hooked to SSG ?
« Reply #2 on: November 30, 2008, 03:06:09 PM »
The oscilloscope is a fancy voltmeter. It gives you a graphical display of voltage, over a period of time. It is especially useful to monitor repetitive oscillations of voltage. Current can also be monitored by using a current probe,a Rogowski coil, or a monitoring resistor of known low ohmage. The "time base" of the scope is adjustable so you can "freeze" even very fast repetitive oscillations.
So you can "hook up" the oscilloscope anywhere you want to monitor voltages, that may change over (usually short) time periods.
They are essential instruments for evaluating the performance of electronic and electromagnetic "free energy" devices, because they allow much more accurate estimations of POWER ( because cheap DMMs don't take duty cycle and waveshape into consideration).

Paul-R

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Re: Oscilloscope hooked to SSG ?
« Reply #3 on: November 30, 2008, 03:54:12 PM »
just connect the scope to one of your coil windings.
WATCH YOUR VOLTAGES.

The spikes can be big. Set the voltage/division to the highest
setting. You might want to put a set of resistors in series with
your probe. You can get attentuating leads, with a lump in
the cable which reduces the voltage 500 times.

If your oscilloscope has a low MHZ rating, the spike may be
too blurred to see at all. (The PC software scopes where the
probe goes into your sound card are not likely to deliver for
this application.
Paul.

prometei

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Re: Oscilloscope hooked to SSG ?
« Reply #4 on: November 30, 2008, 09:19:37 PM »
Thanks ever1 for yo input. I'm going to try connecting the scope first with some resistors in series. I'm not sure though where I would get more relevant info, on the input coil or on the output coil.
BTW I've got a OWON PDS5022 scope, not that expensive and pretty easy to use.

TinselKoala

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Re: Oscilloscope hooked to SSG ?
« Reply #5 on: November 30, 2008, 10:07:34 PM »
That's actually a pretty nice little scope for "amateur" use!
It's a dual-channel DSO, so you can hook up one channel to your input and the other to your output at the same time. It has 1 megohm input impedance so your (low freq) circuit won't notice it's there. And it has "single-shot" capability, which is extremely useful when examining, well, single shots. Like single cap discharges into a coil, for example.
The 25 MHz bandwidth won't be much of an impediment for the Bedini work, although it is nice to have a fast rise-time for this kind of "pulsy" work.

I looked at the manual, and the math functions are kind of limited. It will only do addition and subtraction between traces, not multiplication or integration over time. However, the "measure" function will give "rms" voltages, but I couldn't find out whether that is accurate for all waveforms or only sinusoids. Still, it will be useful for your power measurements.

In any case, you should have a lot of fun with this simple scope, and it should prevent you from making some fundamental errors that folks without scopes often make.

Yucca

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Re: Oscilloscope hooked to SSG ?
« Reply #6 on: November 30, 2008, 10:16:23 PM »
Nice little scope
(http://www.owon.com.cn/eng/hds6062_sm%20%E6%8B%B7%E8%B4%9D.jpg)

Your inputs are rated 300V max, be real careful you don´t zap it. Only takes one careless touch and your input stages get fried or even worse at higher Vs.

Whenever I work with coils I hang my regular probes up and just do everything with 100x probes. You can get fairly good value 100x probes on ebay:

http://shop.ebay.com/?_nkw=100x+probe

If you make your own attenuator then you could make one using a small metal box with a BNC socket on one side and a BNC plug on the other and then put your divider resistors in the box. That way you can just use your probe without having to worry about touching high V.

Thaelin

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Re: Oscilloscope hooked to SSG ?
« Reply #7 on: December 03, 2008, 01:53:11 PM »
   Then you could do like me, I bought an old "tube" type scope and use it first to see what the voltage might be. I have used it on 1000v
readings and have to guess as to its exact but sure cant kill it. Then I go to my Tek 250mhz to see things right. After frying my 60mhz
scope, I am real careful.

   Could I inquire as to where you came by it? I have been looking for one so as to have a totally isolated unit. The 60mhz one I looked at
would run on batteries as well. Thanks

thaelin

prometei

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Re: Oscilloscope hooked to SSG ?
« Reply #8 on: December 05, 2008, 02:44:49 PM »
Hi, I've bought mine from Saelig http://www.saelig.com/miva/merchant.mvc?Screen=PROD&Product_Code=PSSA002&Category_Code= they also sell one with a battery

Gruß
Trey

DreamThinkBuild

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Re: Oscilloscope hooked to SSG ?
« Reply #9 on: December 05, 2008, 03:13:48 PM »
I just picked up one of these, the price was good for a 60Mhz.

http://www.elexp.com/tst_ds10.htm