KYORITSU 3147A - Manual (Page 11)

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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.
5−3 Battery voltage check
(1) Connect the test lead to the instrument, and set the Range
switch to the BATT. CHECK position.
(2) Press the Test button or Remote control switch.
(3) If the meter pointer does not move to BATT GOOD, replace
the batteries as shown in Section 7 "Battery replacement".
CAUTION
Never keep the Test button pressed or locked during battery
check to avoid battery power drain.
5−4 Power-on-indication LED
On an insulation resistance range or BATT. CHECK range,
when the Test button or Remote control switch is pressed, the
power-on-indication LED (red) lights up, indicating the
instrument is in the operation mode.
Batteries have exhausted.
Replace the batteries. Proceed to measurement.