Re: Active device measurements.
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I've done the active DUT, testing a small signal amplifier. I used attenuators as you suggested to keep signals within limits.
I don't know about the 1 watt though. I guess you'd need about 30 dB of gain beyond the PHSNA, so that would take two or more stages. Probably could put something together from EMRFD. Then you might need something like the -40 dB tap from the original Hayward - Larking article to look at the output of your 10 W amp. The flattness of your intermediate 0 dB to 30 dB amplifier would affect the result of your testing of the amplifier, so you'd have to factor that in ... sort of like we do now with PHSNA's frequency compensation polynomials.
Have fun with it!
On Thu, Dec 4, 2014 at 11:13 AM, f4hga@... [PHSNA] <PHSNA@...> wrote: