[Test-Equipment] Re: Oscilloscopes

[J. Forster]

David DiGiacomo wrote:

> >IMO, the 7104 is an orphan, so that's easy to eliminate.
>
> I'm not sure why it's more of an orphan than the other 7000 series scopes.
> If you need a CRT, R7103s are usually pretty cheap.

Just my opinion, based on my experiences. You could well be right.

> >The 7834 is nice if you need a fast storage scope. They are very nice, unless
> >you have CRT problems. Getting another may be really hard. Not a common scope,
> >BTW. It will do one-shot stuff the 7854 and 7633 will not. It's a true two beam
> >scope with analog storage.
>
> According to the manual, the 7834 is a single beam scope.
> I believe the 7844 is the only dual beam 7000 series mainframe.

Sorry...  senior moment.

> >When designing an inverter, I put transistor collector voltage on one trace,
> >current on another and computed point-by-point power dissipation to aid in
> >tweaking the switching circuit. Very useful.
>
> That's a great idea.

Thanks. I was trying to reduce the base overdrive to minimize dissipation during the
switching period (which can peak at several hundred watts) and improve the overall
efficiency and conducted EMI. I was able to make a quiet, high reliability DC/DC
inverter in the 150 watt range with an efficiency of greater than 96%. Worked like a
charm.

-John