KYORITSU 3126 - Manual (Page 18)

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Principle of Insulation Resistance Measurement
Resistance value can be obtained by applying a certain high
voltage to the resistance (insulation resistance) and measuring the
flowing current.
Resistance value = Voltage / Current
(RX = V / I)
6-3 Continuous measurement
Press down and turn the Test button clockwise to lock it to perform
a continuous measurement of insulation resistance. After testing,
turn the button counterclockwise and set it to the initial position.
# DANGER
● Be extremely careful not to get electric shock as high voltage is
present on the tip of test leads continuously.
LINE(-)
EARTH(+)
RESISTANCE VALUE: RX
CURRENT: I
VOLTAGE: V