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[poynt99]

OK Brad.

Confirm your 100 Ohm resistor as well, then redo your test #2.

The litmus test is to make sure that VR2/R2 = VR3/R3. (the measurements you took before don't work out as equal).

VR2 is easy (it is VCH2). VR3 is VCH1 - VCH2

You may also wish to redo your resistor value test, but this time use a 1V 3kHz signal and see what value your 10 Ohm and 100 Ohm come to.

[picowatt]

Ok,i just went and checked the resistors a different way.
I supplied 1 volt across the 10 ohm resistors with my power supply,and used my scope to make sure there was 1 volt across the resistor. I used my DMM set to the 10 amp scale to measure the current. The DMM has a .1 ohm shunt resistor to measure current on the 10 amp scale.
The current measured was 96mA. This gives us a resistance of 10.416-minus the .1 ohm shunt in the DMM. So the measured resistance of 10.3 ohms has now been measured in two ways.

DC Current: 200mA ± (1.5% rdg + 1dgt), 10A (2.0% rdg +5dgt)

How do you know the 10A shunt is exactly 0R1? 

Also, note that the 200ma scale offers a bit more accuracy...

[EMJunkie]

@Tinman, Picowatt and Poynt99

It seems to me that a lot of "What If's" are being passed here...

Why not look for a Solution!

I will donate $10.00 to the cause - Poynt99 if you organize some Precision Resistors that you and Picowatt are happy for Tinman to proceed with experiments and leave behind this pointless debate!

   Chris Sykes
       hyiq.org

[Magluvin]

Ive had the Wavetek 2030 for about 15 years, I think.  Paid $329 back then. Some years later it was stolen. Bout 6 years back I found one on ebay for $35. Snapped it up. Still have it.

Resistance measures down to .01 ohm. It has a relative button that when you short the leads the meter shows the resistance then press the rel button and it zeros out.

Having that measuring ability is awesome. Can find 'the' shorted component on a board that shares a common supply. Also when repairing audio amps, you can check those .47ohm or .22ohm resistors with decent confidence.

None on ebay right now but sometimes it is.

There are other meters that can measure to .01 out there. I think fluke has 1 or 2.

Then there are bench top meters that have better resolution I believe.

http://www.tequipment.net/WavetekMeterman2030.html



Mags

[tinman]

Only spent 30 minutes in the workshop today,as the flu is kicking my ass ATM.

Anyway,i carried out the following test today in prep for Vortex's looping blocking oscillator setup.
I wanted to see what the flyback looked like across the inner secondary when the transistor switched off(becomes open). Guess what i found-!no! flyback spike on the inner secondary.

The scope shots below tell the tail. I have a 100 ohm resistor across both the inner and outer secondary(two resistors,1 over each secondary). The yellow trace is across the outer secondary,and the blue trace is across the inner secondary. The primary i am pulsing with 12 volt's.. I am using my SG to switch a tip3055,and a duty cycle of 20%.

What these results tell me is that the field(magnetic or electric-depending on what you believe)around the outer secondary builds very rapidly-causing the overshoot when the transistor switches on. As the current flow in the outer secondary builds up higher,the field starts to slow in expansion,and the voltage across the secondary drop's,and reaches a steady state-our CEMF taking place. But in the case of the inner secondary,we do not see an over shoot or an inductive kickback spike.

Whats your thought's on this?.

P.S
The second scope shot says looking at the outer !primary! alone-->that should say outer secondary.