KYORITSU 3131A - Manual (Page 14)

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Principle of Continuity Testing (Resistance Test)
Resistance value can be obtained by applying a certain current to the
resistance under test and measuring the voltage generated on the both
sides of the resistance under test.
Resistance Value = Voltage/Current
RX = V/I
6-4 Continuous Measurement
A lock down feature is incorporated on the test button. Pressing and
turning it clockwise, lock the test button in the continuous operating
position.
To release the lock turn the test button counterclockwise.
DANGER
Be extremely careful not to get electric shock during insulation resistance
measurement as high voltage is present on the tip of the test probe
continuously.
① Set the range selector switch to the desired position xΩor x 10Ω.
② Short the line probe (red) and the earth clip of the test probe (black) and
press the test button. Adjust the ohm zero adjust to zero the pointer on
the scale.
③ Connect the test probes to the circuit under test and press the test button.
④ Read the scale directly for xΩrange, multiply by 10 for x 10Ωrange.
Fig.6
continuity
EARTH（−）
LINE（＋）
VOLTAGE:V
RESISTANCE
VALUE:RX
CURRENT:I