Ok Chaps, thanks for all your help so far, but i have to admit that my knowledge and understanding in this area is very limited and i am trying to do something a bit above my level, none the less, i still want to give it a go.
I have attached my circuit (i think) for measuring the capacitance, where cx is the unknown capacitor that is being created in the oil. Sorry about the missing values (and even the ones that are there might be a bit wrong, i'm afraid i have left my diagram somewhere.)
I am prob expecting this to be much simpler than it is, but what i was hoping for was some sort of addition to my circuit that would allow me to basically plug my circuit into my computer and i would be able to see (and manipulate) data.
By the sounds of thins HANKS liberty basic and just basic suggestion are the closest to what i was looking for.
But i have to confess i don't know what RS-232 is?
Also, is the parallel port that cable with the screw things in it?
I have searched RS-232 on sites such as maplins and RS and have found millions of items ranging from pennys to hundreds of pounds and really don't have a clue what i am looking for.
If its not too much to ask, can you break things down for me as i am a bit slow.
Oh and by the way, i'm not a 'he' i'm a girly