Multifunction Tester
Safety Pretest for Insulation Resistance Measurements
27
Safety Pretest for Insulation Resistance
Measurements
The 1674 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.
W Caution
To use Safety Pretest, the Tester must be connected to the phase (red terminal),
neutral (blue terminal), and protective earth line (green terminal). See Figure 7.
The Tester shows all three black dots in the terminal diagram 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.
Figure 7. Connection for Safety Pretest
If the Tester detects that an appliance is connected, it will stop the insulation test.
To continue an insulation test and override the warning:
1. Select Pretest to turn off the pretest.
2. Disconnect any appliances that may still be connected to the circuitry.
3. Select Pretest again to detect and verify that all devices have been disconnected.
Note
Pay attention to electronically-controlled lighting systems and LED-lights that are
connected semi-permanently.
W Caution
If you override the Safety Pretest warning and continue, the test voltage can
damage any connected appliance.
To restart the pretest, select Pretest again.
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