RFC cross connect formula

[gazdkw82]

I may have asked this question before but I forgot what was said and the problem has reered it's ugly head again.

I was doing some RFC testing the other day. Did my cross connecting but when I was doing the calcs I kept getting the wrong figure. It seemed I was not pressing = before dividing by 4. Having corrected the way I did the formula (R1+R2 =, then ÷4) I got the correct figure.

However, I went on to do another RFC on the same installation and I got the opposite problem. If I did R1+R2= then divide by 4 it was the wrong predicted reading. Doing R1+R2÷4 (without the =) predicted the correct result.

What is the correct way to do it?

 

[static zap]

bit confusing though Gaz, if you are taking readings at spurred sockets.

I thought that was the point , identify spurred sockets.
(without actually disturbing any sockets.)
So rings within rings - a very DIY thing don't happen!

 

[Pete999]

I thought that was the point , identify spurred sockets.
(without actually disturbing any sockets.)
So rings within rings - a very DIY thing don't happen!

Agree mate was just commenting on Gaz's post