koban KRA-4000M Manuel D'instructions page 56

LOCK :In the insulation resistance testing function ,press
the
"LOCK" button ,and then push down the " TEST" key, it will
occur the
high-voltage and enter the insulation resistance testing
status. Press
the "TEST" button once more ,it will shutoff the high-voltage
and exit
from the insulation resistance testing status.
TEST : In the insulation resistance testing function ,pressing
and
holding the "TEST" button, The meter will bring high-voltage,
and
enter into the insulation resistance testing, being free from
the
"TEST" , it will cutoff the high-voltage and exit form the
insulation
resistance testing.
ZERO/LIGHT :Iinstant-pressing the "ZERO/LIGHT" button in
the 1st
time, the current values in the primary display will be set
zero,(mainly used for 400Ω, the low resistance testing), ,it
will return
if in the 2nd time. pressing for 2 seconds, it will enter directly
into the
"LIGHT" status, and the LCD backlight light up. After 15
seconds, the
backlight is shut off automatically, the same as pressing for
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DIGITAL INSULATION TESTER
KRA-4000M
9