Some recent purchase of probes and an injection transformer will allow me to test drive the Power Application that is included with this scope. The hope is that I can avoid buying a dedicated Frequency Response Analyzer by getting a 'close enough' measurement with the scope. I still have a number of power projects to finish before I attempt any high-speed digital designs.
I purchased a LeCroy DA1855 100Mhz differential pre-amplifier for non-ground referenced measurements and very small signals common in the feedback loops of SMPS. It is also fantastic for measuring small and fast currents with sense resistors. I can use very small resistors and still get a measurment.
Looking for a second one of these, but I need to be patient for a reasonable deal.
2x DC current probes Tek A6302 20A 50Mhz with AM503B external amplifiers. These were a relative bargain as far as current probe go, but the amplifiers are massive. Considering I save a few $K, I will figure out how to arrange the bench for these.
2x 1:1 probes for looking at the small low frequency signals. Limited uses, but they will be handy periodically. Too cheap not to have them.
I am re-purposing a Jensen video transformer to use as an injection transformer similar to what Picotest and Ridley sell. The Pico transformer is $525 US - the Jensen is $18 on eBay. The bandwidth is not nearly as wide, but I don't need wide bandwidth as much as I need to save some money.
This should be a good start for measuring and analyzing SMPS, power distribution, eFuses, etc. The scopes FFT, power analysis tools, and dual channel function generator will allow reasonably advanced analysis with a single box. Seriously considering getting the Keysight Power Rail Probe N7020A
http://www.keysight.com/en/pd-2471132-pn-N7020A/power-rail-probe?cc=US&lc=engIt is a relatively new design and not on the used market - may have to spring for full price on that one.
After that - high speed digital probes are next on my shopping list. The Agilent 1152A 2.5Ghz active single ended probes look like excellent day-to-day signal hunters and they are not expensive at all. Still a good distance from needing the full bandwidth 6Ghz probes which is good because those suckers are >$3k used EACH. I will look at those when I have a project starting so that I can have some revenue to cover the cost within a reasonable amount of time.