KYORITSU 3161A - 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.
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.
CAUTION
Instrument doesn't operate without connecting the test lead
even if the Test button is pressed down. Battery check and
operation check are not available without connecting the test
lead. The Backlight function is available at any time.