KYORITSU 3126 - Manual (Page 16)

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Connect the Earth cord to the Earth (ground) terminal.
It is recommended to connect the positive(+) pole to the earth
side when measuring insulation resistance against the ground or
when a part of the equipment under test is earthed.
With this connection, smaller measured value can be obtained
comparing with other way round.
(1) Check the appropriate voltages to be applied to the circuit
under test, and set the Range switch to any desired insulation
resistance range.
(2) Connect the Earth cord (black) to the Earth terminal of the circuit
under test.
(3) Put the tip of the Line probe (red) to the circuit under test.
Then press the Test button. The buzzer sounds intermittently
during measurement when a range other than 500V is selected.
(4) The measured value will be displayed on the LCD, and it
remains displayed on the LCD after a measurement.
# CAUTION
Turn off the breaker of
the circuit under test.
(5) This instrument has Auto-discharge function.
Keep the test leads connected to the circuit under test and
release the Test button when measurements end. The auto-
discharge function operates to discharge the electrical charges on
the circuit under test. Confirm that the voltage monitor shows 0V.
# DANGER
● Do not touch the circuit under test immediately after testing.
Capacitance stored in the circuit may cause electric shock.
● Leave test leads connected to the circuit and never touch the
circuit until the discharge completes.