HT instruments М75 - Manual (Page 18)

M72 - M73 - M74 - M75
EN - 16
Fig. 6: Connection of the instrument’s terminals during calibration procedure
3. Press MODE/PEAK for more than 1 second. The instrument resets the resistance of
the cables, the symbol "CAL" is displayed
CAUTION
While MODE/PEAK is pressed the instrument is measuring. During this phase
never disconnect test leads.
4. The instrument performs the calibration of cables with resistance lower than 5 
5. At the end of the test the measured value is stored by the instrument and used as
OFFSET, which means it’s deducted from all continuity tests performed) for all further
measurements until a new calibration is made
6. If the value measured during the calibration phase is higher than 5  (e.g. open
terminals) the instrument interruptus the calibration, removes the offset value
previously stored and does not display the CAL symbol until the next positive
calibration. This method can be used to nullify the last calibration performed
7. Each time the instrument is switched off the calibrated value is lost
4.9.2. Anomalous cases which may occur during  measurement
1. The full scale of the instrument is
39.99k .
If the resistance value is higher than this
value, or in case of open or interrupted
probes, the instrument displays the
screen beside