I have various equipment, mostly HP and Fluke that keeps few things warm at all times. When I turn switches OFF, it goes to stand-by mode. Typically, signal generators, frequency counters, and some power supplies(?) work this way. I can understand the need to keep OCXO and XO running so they are instantly available.
But in home lab environment, it sucks down power (which I have to pay for), gets the room warm, generate noise (sound from fan), and it is not that desirable. I have all frequency dependent equipment hooked up to a common lab reference, which is always on.
In this setup, would it hurt anything to physically remove the power and turn everything off? And when I turn them on, because of the external reference, be available and accurate immediately? I ask this because I don't know external reference is used as standard, or it actually steers internal oscillators. In later case, it might take a while to stabilize.