KYORITSU 3126 - Manual (Page 13)

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5. Preparation for measurement
5-1 Checking the battery voltage
(1) Set the Range switch to any position other than “OFF”.
(2) When the battery mark shown at the upper left on the LCD is
last 1 level , the batteries are almost exhausted.
Replace the batteries with new ones to continue further
measurements.
The instrument operates properly even in such a low battery
power condition and it may not affect the accuracy.
When battery mark is empty , the battery voltage is below
the lower limit of the operating voltage. In such a condition, the
accuracy isn’t guaranteed.
Look up Chapter 7. Battery Replacement in this manual, which
describes how to replace the batteries.
5-2 Connecting test leads
Insert the test lead firmly to the connector terminal on the
instrument. Connect the Line Probe(red) to the Line terminal, the
Earth Cord(black) to the Earth terminal and the Guard Cord (green)
to the Guard terminal. (To establish guard is not necessary, you do
not have to connect the Guard cord.)
# DANGER
● Do not press the Test button while the Range switch is at the
Insulation measurement position. High voltages are applied to
the test leads and you may get electrical shocks.