The nice thing about bridge-like measurements is that you are only looking for a null,so the distance to fault result is not put in error by variation in the exact sensitivity of the meter or the battery voltage.
Or indeed (if I've understood the method correctly) by the unknown resistance of the fault itself (which may not be of negligible impedance, despite BS 7671 best efforts).
The nice thing about bridge-like measurements is that you are only looking for a null,so the distance to fault result is not put in error by variation in the exact sensitivity of the meter or the battery voltage.
Or indeed (if I've understood the method correctly) by the unknown resistance of the fault itself (which may not be of negligible impedance, despite BS 7671 best efforts).
