KYORITSU 6010A - Manual (Page 18)

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7．When testing is complete release the test button BEFORE disconnecting
the test leads from the circuit or from the appliance. This will ensure that
the charge built up by the circuit or the appliance during insulation test is
dissipated in the discharge circuit. In the discharging process, an LED
illuminates and the live circuit warning buzzer will sound.
CAUTION
NEVER TURN THE FUNCTION DIAL WHILST THE TEST BUTTON
IS DE P R ESSE D AS TH IS MAY DAMAG E TH E I NSTR U M E NT.
N E V E R TO U C H T H E C I R C U I T, T E ST L E A D T I P S O R T H E
APPLIANCE UNDER TEST DURING INSULATION TESTING.
Note：If the reading measured greater than 200MΩ the over range reading
“OL”will be displayed.