Amprobe AMB-110 Insulation-Resistance-Tester - Manual (Page 11)

6
OPERATION
Performing measurements
Switching on the instrument
Autocalibration
The instrument is switched ON by pressing the ON/OFF key. After turning on, the instrument will
execute the autocalibration (Fig. 2).
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. 3) 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 5 °C.
Fig. 1 First introduction Fig. 2 Auto-calibration
state
Fig. 3 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.
AMB-110 10kV