r1 + r2 by taking away ze from zs

[dannyv]

Is it alright to take away ze from zs to get r1 + r2 reading

 

[telectrix]

my post also. just wondering if that was one of the reasons it took me so long, i can't do more than 2 small dometic PIrs in a day.

 

[Des 56]

but is it necessary on a PIR to measure R1+R2, as the circuit has already been verified when installed and energised. measurement of Zs, when compared to previous readings should confirm that the R1+R2 is satisfactory.

Good point
Figure of 8 and bridged rings and polarity of sockets
Anyone want to comment on guidance note 3
3.10.2