Rosemary Ainslie Circuit Demonstration, June 1 2013

[poynt99]

Here is the schematic I used to simulate the last two scope shots.

Notice that I am now using the proper 50 Ohms for the FG  .

I believe this is the closest I've been able to simulate the circuit. It would appear even more alike if I extended the run times to the time scale as was shown in Fig 3.

[poynt99]

Here is a Feb 2011 scope shot from Rose that I had annotated with a question; why no current if the SW is ON?

The wave forms are quite close, but I'm not sure why the FG signal appears so poorly formed. Even if Q1 was intact, it is doubtful there is enough Gate drive in this scope shot to turn it ON.

[picowatt]

Here is a Feb 2011 scope shot from Rose that I had annotated with a question; why no current if the SW is ON?

The wave forms are quite close, but I'm not sure why the FG signal appears so poorly formed. Even if Q1 was intact, it is doubtful there is enough Gate drive in this scope shot to turn it ON.

.99,

I do not think that this annotated capture is the one I was referring to.  This capture has the wierd "AC coupled looking" FG trace.

I was referring to a capture I believe you annotated of FG3 that marked what the offset numbers referred to (distance from center line), the FG +12Volts, the CSR zero, etc.

It would have been soon after I questoned her about Q1 in FIG3, which would have been March or April (possibly May) after her demo.  If you dig around in your files around that time frame, you might find it.  I can't seem to find the locked RA thread or my posts from that thread, or I would narrow the time down a bit more for you.

Recall at the time that she stated we needed to somehow subtract the "offset" numbers from the displayed data or some such thing, which was why I called LeCroy to confirm that we were indeed reading the scope captures correctly.  Also recall that the LeCroy and the Tek scopes differ with regard to how the offset numbers are used.  I believe the capture you annotated was to allow her to have someone review/confirm the way we were reading the LeCroy captures.   

PW

[poynt99]

Hi PW.

I recall the figure you were referring to, however that wasn't what I was trying to post there. 

If you really want me to dig that scope shot up, let me know and I will look for it.

[poynt99]

Ah, is this the one?