Many thanks for your explanation of what's happening and why, appreciate that!. I noticed it initially when I first switched on from cold (when the instrument arrived) and on every other switch on since. Like I say i'm not concerned big time about it but I just don't remember it happening with regard my other KN7000's.

Once again, many thanks, least it's put my mind at rest.

Peter L

PS: just in case anyone is looking for a cheap second hand KN7000 here in the UK, during my phone calls to locate one, Eddie Moors of Bounmouth have a average condition instrument for sale for £599, this includes 3 months warranty