How to use emitter interpolation?

[yjcnbnbnb200]

I simulate an emitter in a low resolution 1.0, then I set interpolation to Local and emitter state to Cache, then I change resolution up to 10.0, press Enter key, many particles borned, but after I slide the time slider, it returns to low resolution of 1.0.

I think some of my steps must be wrong, then I look for help pdf, it only explains what interpolation is but do not have how to use it.

Can anyone tell me the correct steps of using interpolation, many Thanks first!@!