I use the much older Hp 5372A time/frequency analyzer, before they came up with the name Modulation Domain analyzer. It uses the 68000 processor series and is a bit dated from the 1980s, but when it comes to binning frequency fluctuations from our master RF reference source at the particle factory, this is the box. The older ones were all in one, with buttons to bring up statistics, allen dev, and other oscillator checks. It has an internal HP10811-series ovenized oscillator so everything is compared to that, or you can compare two different channels. I used it to prove that our fancy GPS-disciplined Meridian reference was awful compared to an old HP 105A double ovenized standard (that has the same 101811 inside!). Eventually we scrapped the Meridian receivers and got a new Stanford Research Associates GPS-disciplined source with excellent ovenized crystal oscillator. So I have to hand it to the 5372A for making the proof that I needed to convince another engineer that his new receivers were not up to snuff. I haven't played with the later modulation domain analyzers like the 53310A, so would be curious to hear how it works out and what sort of applications its handy for.
