KYORITSU 6011A - Manual (Page 19)

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6．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 WHILE THE TEST BUTTON IS
DEPRESSED AS THIS MAY DAMAGE THE INSTRUMENT. NEVER
TOUC H TH E C I RC U IT, TEST LEAD TI P S OR TH E AP P LIANC E
UNDER TEST DURING INSULATION TESTING.
Note：If the reading measured greater than 200MΩthe over range reading
“OL”will be displayed.