KYORITSU 3023 - Manual (Page 11)

5-1 Test lead connection
Insert the Probe connector into the Probe socket on the instrument
correctly as shown below.
5-2 Checks on Test lead and Fuse
(1) Set the Range selector switch on the instrument to theΩ
(CONTINUITY) position.
(2) Break in test lead or fuse is suspected if "OL" is displayed on the
LCD when shorting the LINE(red) and EARTH(black).
(3) Test lead or instrument itself may have troubles when "OL" is
displayed on the LCD after replacing the fuse. In this case, send
the instrument to your local KYORITSU distributor for repair.
DANGER
¡ When the Test button or the Remote control switch is pressed
while the Range selector 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.
¡ Test lead and fuse must be inspected prior to measurement
according to Clause 5-2 indicated in this manual in order to avoid
possible electrical shock hazard. Voltage cannot be measured if a
break is present on the fuse.
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Probe socket
Probe connector
５．Preparation for measurement
Fig. 3