TESTBOY TV 450
Resistance of earth connection
33
5.3.1 R LOW
Ω
, 200 mA resistance measurement
The resistance measurement is performed with automatic polarity reversal of the test
voltage.
Test circuit for R LOW
Ω
measurement
Figure 5.9: Connection of 3-wire test lead plus optional extension lead
Resistance to earth connection and equipotential bonding measurement procedure
* model TESTBOY TV 450 (TYPE B)
Select continuity function using the function selector switch.
Set sub-function to
R LOW
Ω
.
Enable and set
limit
(optional).
Connect
test cable to the the instrument.
Compensate
the test leads resistance (if necessary, see
section 5.3.3
).
Disconnect
from mains supply and discharge installation to be tested.
Connect
the test leads to the appropriate PE wiring (see
figure
5.9
).
Press the
TEST
key to perform the measurement.
After the measurement is finished
store
the result by pressing the MEM button
(optional)*.
Figure 5.10: Example of RLOW result
Displayed result:
R................R LOW
Ω
resistance.
R+..............Result at positive polarity
R-...............Result at negative test polarity
