MI 3121 Smartec Insulation / Continuity
Continuity
23
5.2 Resistance of earth connection and equipotential bonding
The resistance measurement is performed in order to assure that the protective measures
against electric shock through earth bond connections are effective. Two sub-functions are
available:
RLOW - Earth bond resistance measurement according to EN 61557-4 (200 mA),
CONT - Continuous resistance measurement performed with 7 mA.
See chapter
4.1 Function selection
for instructions on
key functionality.
Figure 5.4: 200 mA RLOW
function example
Test parameters for resistance measurement
TEST Resistance
measurement
sub-function
[RLOW, CONT]
Limit
Maximum resistance
[OFF, 0.1
Ω
÷ 20.0
Ω
]
5.2.1 RLOW, 200 mA resistance measurement
The resistance measurement is performed with automatic polarity reversal of the test
voltage.
Test circuit for RLOW measurement
Figure 5.5: Connection of universal test cable plus optional extension lead
