There are various ways to do it. If you are not localizing it can be more difficult.
Way #1 (Localizied) - Once you have your base and rover set up and have a good fix, go to a known point such as site control setup by a surveyor and take a shot. If you used that control in your localization you should hit it dead nuts. +/- .02-.03. You can also check elevations if they are written on the back of stakes and make sure you are coming up with the same readings.
Way #2 (Non-Localized) - The preface of this is that you have already set up the site and have set your base on a known point and entered the coordinates correctly with the correct antenna height. Same steps, once your base is set up, go take a shot on a known point that you had previously set out. If you don’t have the same reading as when you set it you messed up somewhere.