Loω: Continuity Test On Earth, Protective And Equalizing Potential Conductors - Tenmars TM-507 User Manual

4.5. LoΩ: CONTINUITY TEST ON EARTH, PROTECTIVE AND EQUALIZING POTENTIAL
CONDUCTORS
The measurement is performed with a test current higher than 200 mA (R<5Ω) and open circuit
voltage ranging from 4 to 24V DC according to EN 61557-2 and VDE 0413 part 4.
Before taking resistance measurements make sure that the circuit under test is
not powered and that eventual condensers are discharged. The measured
value is out of accuracy if an input voltage is present.
Fig. 6: Connection of the instrument's terminals during LoΩ test
1.
2.
3. Insert the black and red cables in the corresponding input terminals of the instrument
4. If the measuring cables being used have not been
calibrated, first calibrate them as described in
paragraph 4.5.1
5. Position the test probes on the desired points of
the circuit under test (see Fig. 6)
Press
6.
measurement
7. +
8. In lock mode the instrument emits an acoustic signal and the auto power off is disabled
CAUTION
Turn on the instrument
Press the arrow keys to select LoΩ
to perform
GO
Press LOCK and GO to perform the measurement in
continuous mode, the symbol LOCK is displayed. Press GO
another time to stop the continuous mode measurement
the
EN - 11
TM-507
Resistance value