Description of the rotary switch functions, Caution – HT instruments SIRIUS87 User Manual

Page 11

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SIRIUS

87

EN - 9

4. DESCRIPTION OF THE ROTARY SWITCH FUNCTIONS

4.1. LOW

: CONTINUITY TEST OF EARTH CONDUCTORS WITH 200MA

The measurement is performed with a test current higher than 200mA and open circuit
voltage ranging from 4 to 24V DC according to IEC/EN 61557-2 and VDE 0413 part 4.

CAUTION

Before carrying out the continuity test make sure that there is no voltage at the
ends of the conductor under test.


Turn the

switch on LOW

 position.

Switch on the instrument.


The key

FUNC permits to select one of the following measuring modes

(which can be shown cyclically when pressing the key):

 Mode

AUTO (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.

 Mode

R + TIMER (measurement with positive polarity and possibility of

setting 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 so detecting any
bad connection.

 Mode

R - TIMER (measurement with negative polarity and possibility of

setting 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 so detecting any
bad connection.

 Mode

CAL (compensation of the resistance of the cables used for the

measurement).

CAUTION

If the resistance is lower than 5

 (including the resistance of the calibration)

the continuity test is effected by the instrument with a current higher than
200mA. If the resistance is higher than 5

 the continuity test is effected by

the instrument with a decreasing current.



FUNC

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