HT instruments M71 - Manual (Page 13)

M71
EN – 12
4.3.3. Message description for EARTH 2W measurement
1. If the following condition is met:
R
DISPLAYED
< 0.11 Ω
the instrument displays the symbol
indicating that the reading may be affected
by a relative error higher than 30%.
2. If the following condition is met:
Disruptive voltage > 3.0V
the instrument displays the symbol
indicating that the reading is carried out
under critical conditions.
3. If the following condition is met:
R
MEASURED
- R
CABLES
< - 0.03 Ω
the instrument displays the side screen and
emits a long sound tone indicating an
anomalous condition then displays the initial
screen again. This message indicates that
the measured resistance is lower than that
of measuring cables and that a further zero
setting procedure is to be carried out.
4. When measuring, if terminals' voltage is
higher than 6V, the instrument does not
effect the test. A long sound tone is emitted
indicating an anomalous condition and the
side screen is displayed for 5 seconds (S-E
indicates between which inputs voltage was
detected), then the instrument displays the
initial screen.
Value of input
voltage
5. Should the resistance value be higher than
the full scale, the instrument emits a long
sound tone indicating the anomalous
condition and displays a screen similar to
the side one. The same indication may also
highlight that measuring cables are
disconnected or open.