Hi, what would you recommend to pickup used on ebay?
Ideally I'd like to get 9-10 digits, need to be able to measure 2 inputs (independently + ratio), 1Hz-150Mhz for clock testing. High precision internal reference is not important, if external GPSDO can be connected.
1) Can "proper" frequency counters measure low frequency signals with high precision? I.e. 1Hz signal, 9-10 digits result, without waiting for days?
2) Does something like 53181A or 53131A around 300-500$ look like a good solution (or 53132A slightly above 600$), if VFD display is working? Any other recommendations (I don't really have any experience with frequency counters)?
3) Can any of sub 1000$ units do Allan deviation plots in 0.1Hz-100kHz range (probably with external software) for recreational time nutting?