KYORITSU 3131A - Manual (Page 11)

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6. Operation
6-1 Disconnection and check of power source of circuit under test
DANGER
● To avoid possible electrical shock, do not perform measurements on
energized (LIVE) circuits.
● Never make measurements with the battery compartment cover
removed.
CAUTION
● Never press the test button if the live circuit warning LED is lit or the
warning buzzer sounds. This may damage the circuit.
Voltage check can be made with the range selector switch at any position.
Be sure to turn off the breaker for the circuit under test.
① Connect the earth clip of the test probe (black) to the earth side and the
line probe (red) to the line side of the circuit under test.
② Ensure that the live circuit warning LED is not lit and the audible warning
is not present. If the LED is lit and the buzzer sounds, never press the test
button. Voltage is generated in the circuit under test. Recheck that the
breaker for the circuit under test is "OFF".
Fig.4
CAUTION
Never press test button
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