MI 3201 TeraOhm 5 kV Plus Performing measurements
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4 Performing measurements
4.1 Switching on the instrument
Auto-calibration
The instrument is switched ON by pressing the ON/OFF key. After turning on, the
instrument will execute the auto-calibration (Fig. 4).
Note:
If batteries are defective or missing and the instrument is powered from mains supply,
the instrument will not turn ON.
Measuring test leads should be disconnected during auto-calibration. If not, the auto-
calibration procedure could be false and instrument will require disconnection of the test
leads and repeat switching OFF and ON.
After finishing the auto-calibration, the MAIN MENU (Fig.5) will appear and instrument
is ready for normal operation.
Auto-calibration prevents the reduction in accuracy when measuring very low currents.
It compensates the effects caused by ageing, temperature and humidity changes etc.
A new auto-calibration is recommended when the temperature changes by more than
5C.
Fig. 4. Auto-calibration state
Fig. 5. Main Menu
Note:
If the instrument detects an incorrect state during the auto-calibration, the following
warning message will be displayed:
ERROR!
-TEST LEADS CONNECTED:
DISCONNECT AND SWITCH ON THE INSTRUMENT AGAIN
- CONDITIONS OUT OF RANGE: PRESS START TO CONTINUE
Possible reasons for out of range conditions are excessive humidity, excessively high
temperature, etc. In this case it is possible to perform measurements by pressing the
START/STOP button again but results could be out of technical specification.
Mains powered instrument operation
If you connect instrument to the mains supply when instrument is turned OFF, internal
charger will begin to charge the batteries but instrument will remain turned OFF. In
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