HT instruments M71 - Manual (Page 17)

M71
EN – 16
1. Press the instrument's start key.
2. Select function EARTH 3W pressing the right arrow key.
3. AUTO
If the circuit under test is assumed to be affected by electric noise press the
AUTO key to select the corresponding mode.
4.
Connect the red cable and the green cable into the corresponding instrument's input
terminals.
5. Connect the crocodiles to the test leads.
6. When necessary (symbol CAL missing or use of a new set of cables) carry out zero setting
of cable resistance (see § 4.4.1)
7. Connect the instrument's terminals to the circuit under test (see Fig. 6).
8. GO Press GO key to start measurement.
9. Display example of earth resistance
and disruptive voltage measured
values.
Should disruptive voltage have been
higher than 0.5V, it would be advisable
to start AUTO mode and repeat
measurement.
Value measured for
earth resistance
Value measured for
disruptive voltage