Say you have 5000 impressions throughout any given month. Now, suppose you spend a lot of time working on your site. Adding links, updating content etc and you are responsible for say 1000 impressions. I would think that those 1000 impressions are included in the total 5000 monthly impressions. Therefore, completely skewing the CTR. Is there a way to block your IP so Google does not include your impressions on your own site?
don;t put the adsense code until you finish your site. and once the site is finished, routine maintanance and updates will not cause any problem if they are natural. 1000 impression just by you updating the site is not normal.