HT instruments М75 - Manual (Page 29)

M72 - M73 - M74 - M75
EN - 27
4.12.2. Anomalous cases which may occur during  0.2A tests
1. If the following condition occur:
R
MEASURED
- R
CALIBRATION
< -0.02 
the instrument displays the screen beside
and emits a prolonged sound to signal
the anomalous situation
2. If the voltage present at the terminals is
higher than 10V the instrument does not
perform the test and emits a prolonged
sound to signal the anomalous situation.
The screen beside is displayed for 5
seconds, after which the instrument
displays the default value related to the

0.2A test
Input voltage
3. If the resistance value is higher than the
full scale the instrument emits a
prolonged sound to signal the anomalous
situation. A screen similar to this is
displayed. The same message may also
mean that mesuring cables are
disconnected or open
4. The instrument dispalys the
CAUTION symbol with the “OK” message
when:

The instrument is operating in a
critical situation as for example in
presence of overvoltages
 The instrument cannot guarantee the
measuring uncertainty lower than
30% of the reading, according to
EN61557-1