HT instruments MACROTEST G3 - Manual (Page 63)

MACROTESTG3 - COMBIG3
EN - 62
5.
Touch the icon to zero the value in the "A" field and
use the virtual keyboard to set the value of fault current
(declared by the Energy distribution board) between 1A
and 9999A. Confirm the choice by going back to the
initial measurement screen.
Touch the icon in the lower right corner to set the
tripping time of the RCD. The following screen appears
on the display:
6.
Touch the icon to zero the value in the "s" field and
use the virtual keyboard to set the value of the time for
fault elimination t (declared by the Energy distribution
board) between 0.04s and 10s.
On the basis of previous selections, the instrument
performs the calculation of the maximum limit of earth
resistance according to the value of maximum
allowable contact voltage (see § 12.11) that will
compare with the measured value in order to provide
the final positive or negative result of the measurement.
Confirm the choice by going back to the initial
measurement screen.
7. For resistivity measurement, the instrument shows
the initial screen as in the figure to the side.
Touch the icon to the right to set the measurement unit
and the distance between the test probes. The
following screen appears on the display:
8. Move the slide bar reference on the left to select the
measurement unit of the distance between the options:
m (meters) or ft (feet).
Move the slide bar reference on the right to select the
distance "d" between the measuring probes choosing
between 1m
 10m (3ft  30ft).
Confirm the choices by going back to the initial
measurement screen.
9. Connect the blue, red, green and black cables to the corresponding instrument input
terminals H, S, ES, E, then add the alligator clips, if necessary.
10Extend, if necessary, the blue and red measuring cables on a separate way by means of
cables with proper section. Adding any extension does not require calibration and does
not affect the measured earth resistance value.