Amprobe Multitest-1000 Continuity-Tester - Manual (Page 12)

4. DESCRIPTION OF THE ROTARY SWITCH FUNCTIONS
4.1. LOW Ω: CONTINUITY TEST OF EARTH RESISTIVITY, PROTECTIVE AND
EQUALIZING POTENTIAL CONDUCTORS
The measurement is performed with a test current greater than 200 mA and open circuit
voltage ranging from 4 to 24V DC according to EN 61557-2 and VDE 0413 part 4.
WARNING
Before carrying out the continuity test make sure that there is no voltage at the
ends of the conductor under test.
Turn the rotary knob to the LOW Ω position.
Switch on the instrument.
The FUNC key permits you to select one of the following measuring modes:
FUNC
)
AUTO mode (the instrument carries out two measurements with reversed
polarity R+ and R-, and displays their average value R
avg
). This mode is
recommended for the continuity test.
) R + TIMER mode (measurement with positive polarity and the ability to
set the duration time of the test). In this case the operator can set a
measuring time long enough to permit him to move the protective
conductors while the instrument is carrying out the test to detect any bad
connection.
) R – TIMER mode (measurement with negative polarity and the ability to
set the duration time of the test). In this case the operator can set a
measuring time long enough to permit him to move the protective
conductors while the instrument is carrying out the test to detect any bad
connection.
) Mode CAL (compensation of the resistance of the cables used for the
measurement).
Note: If the resistance is lower than 5 Ω (including the resistance of the calibration) the
continuity test is performed by the instrument with a current greater than 200mA. If
the resistance is greater than 5
Ω, the continuity test is performed by the
instrument using a decreasing current.