Power-On Options - Fluke 1662 User Manual

1662/1663/1664 FC
Users Manual

Power-On Options

To select a power-on option, press  and the function push button
simultaneously and then release . See Table 10 for a description of the
options. Power-on options are retained when the Tester is turned off.
Push Power-On
Button Option
Firmware
 
Version
IT mode
 
toggle
Line and
Neutral
 
Swap mode
toggle
20
Table 10. Power-On Options
Turn on the Tester and press  for >3 s. The firmware
version shows when you release .
In IT mode, a loop test or an RCD test is allowed even if
the voltage N-PE is higher than 25 V / 50 V. The default
setting is IT OFF.
Configure the Tester to operate in L-n mode or L-n n-L
mode, see Figure 1.
• In L-n mode, the L and N phase conductors must
NEVER be reversed. This is a requirement in the UK
and other regions. The b icon appears on the
display to indicate that the system L and N conductors
are swapped and the test is inhibited. Investigate and
rectify the cause of this system fault before you
continue. L-n mode also changes the RCD x1/2 trip
time duration to 2000 ms. for UK requirement.
• In L-n n-L mode, the unit allows the L and N phase
conductors to be swapped and tests will continue.
In locations where polarized plugs and outlets are
used, a swapped lead icon (b) may indicate
that the outlet was wired incorrectly. Correct this
problem before you continue with any tests.
The default setting in the UK is L-n. Elsewhere, the default
setting is L-n n-L.
Description
Note