HT instruments MACROTEST G3 - Manual (Page 67)

MACROTESTG3 - COMBIG3
EN - 66
1. Select the options “TN, TT or “IT”, “25 or 50V”, “50Hz or
60Hz” and the reference voltage in the general settings
of the instrument (see § 5.1.3). Touch the icon,
touch the first icon in the lower left corner and set the
measurement mode (see § 6.7.1 point 2). The
following screen appears on the display. The icon
indicates that the clamp T2100 is not connected to the
instrument or is not in "RS232" mode. Configure the
same settings on the protection parameters depending
on the type of system (TT, TN or IT) (see § 6.7.1 points
3, 4, 5, 6).
2. Connect the clamp T2100 by inserting the connector into input In1 of the instrument.
Turn the clamp on and put it in "RS232" mode (see the user manual of the clamp). The
symbol appears on the display of the clamp. In these conditions, the instrument-
clamp group is ready to perform the measurements. The following screen is shown
on the display by the instrument.
3. The meaning of the symbols is the following:
  This icon indicate the correct serial
connection of the clamp to the instrument
  Touch this icon to zero all the values of the
measured probes and the correspondent parallel
resistance
  Touch this icon to add a rod to the
measurement. The "N " parameter increases by one
unit.
 R
A
 indicates the calculation of the parallel of
resistances for each measurement performed on
each rod.
  This indicates the value of contact voltage
resulting from the measurement.
 N  indicates the number of rods in the measure.
 R  indicates the resistance value of the rod
currently measured.
  It allows downloading on the instrument the
memory contents of clamp T2100 in order to obtain
the final result of the measurement.
Rods resistance measurement with clamp T2100 connected to the instrument
4. Connect the clamp to the first rod of the earth network considered as shown in Fig. 30.
Note the value of the resistance in the R field and press the icon to insert this
value in the calculation of parallel resistance and increase the N parameter by one unit
(N =1)