A couple of questions about feeding signal sources to a Siglent SDS1202X-E oscilloscope:
-- For various tests, I'm planning to input reference signals to the scope from sources such as frequency standard, a frequency calibrator, and a VNA in frequency generator mode. I gather that rather than using the scope's probes, it's common to feed such signals into a scope using cable with appropriate connectors on each end (in the case of the devices I'm working with, this would generally be SMA to BNC). Do I need to worry about anything like voltage or power levels? I assume that scopes like this can handle a range of inputs from devices of this type, but want to make sure I don't overlook anything before starting to plug anything in. Is there a general rule of thumb about voltage or power levels that are and aren't safe for a modern digital scope like this? (I obviously wouldn't, for example, feed the RF output of a 100w ham transmitter directly into a scope.)
-- As for the cable to use for connections like this, I have a lot of RG316 coax with SMA connectors on each end in various lengths, as well as SMA-to-BNC adapters. Does this seem adequate for most oscilloscope test purposes, or should I consider investing in anything else? I've seen mention made of higher-end cables such as Suhner, and wonder if that would be worth the investment.