Safety Pretest For Insulation Resistance Measurements - Fluke 1662 User Manual

1662/1663/1664 FC
Users Manual

Safety Pretest for Insulation Resistance Measurements

The 1664 FC model includes the Safety Pretest feature that detects any
appliances connected to the circuit under test. Safety Pretest gives you a
warning before you start a test and prevents damage to appliances from
the test voltage.
To use Safety Pretest, the Tester must be connected to the phase (L
terminal), neutral (N terminal) and protective earth line (PE terminal). See
Figure 4. The Tester shows all three black dots in the terminal indicator
annunciator to guide you. If you use the mains test cord at a mains socket,
this condition is always true when the mains socket is wired correctly.
Safety Pretest works reliably only when you have connected
the L terminal to the phase, the N terminal to the neutral line,
and the PE terminal to the PE line.
26
N (Blue)
B
G
R
L (Red)
Figure 4. Connection for Safety Pretest
WCaution
PE (Green)
L
N
PE
hwl024.eps