KYORITSU 3316 - Manual (Page 11)

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5−1 Mechanical zero adjustment
With the Range switch set to the OFF position and without
pressing the Test button, turn the Zero adjuster with a
screwdriver so that the pointer lines up with the "∞" mark on an
insulation resistance scale. In case the instrument is used at the
sloping place, ensure that the pointer lines up with the "∞" mark
tilting the instrument to the necessary angle.
5−2 Test lead connection
Insert the Probe connector into the Probe socket on the
instrument correctly as shown below.
Probe socket
Probe connector
５．Preparation for measurement
DANGER
When the Test button or the Remote control switch is pressed
with the Range switch set to an insulation resistance range,
take care not to touch the tip of the Test probe where a high
voltage is present in order to avoid possible shock hazard.