Owner's manual

15
 Non-Ferrous Lock (N LOCK?)
(Main Menu)
(FN Probes only)
Select the N LOCK? menu option (non-
ferrous lock) when operating regularly on
non-ferrous substrates. This disables the
automatic substrate determination ability
and forces the probe to only use the eddy
current principle when measuring,
regardless of the substrate. This shortens
measurement time and extends battery
life.
TIP: NN LOCKLOCK is also useful in instances
such as measuring paint on galvanized
(zinc coated) steel. In AUTOmatic
(normal) mode the probe measures
both the paint and zinc over the steel
using the magnetic principle. NN LOCKLOCK
makes the Gage measure the paint
over the zinc only.
TIP: Select NN LOCKLOCK to measure over
slightly magnetic substrates; i.e. clear-
coat on gold over nickel-plated brass.
Although the probe’s magnet is used
for the magnetic principle, it is also
used in N LOCKN LOCK to magnetically
saturate a slightly magnetic substrate
and allow the eddy current principle to
operate unhindered.
WARNING: With NN LOCKLOCK engaged it is
possible to obtain a reading when
measuring non-conductive coatings on
steel. However, eddy current is not the
preferred measuring principle on steel.
Select the FN AUTO?FN AUTO? menu option to
return the probe to its auto selecting
capability.