KYORITSU 3123A - Manual (Page 7)

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CAUTION:
BE CAREFUL ABOUT HIGH VOLTAGE PRESENT ACROSS LINE
AND EARTH TERMINALS OF INSTRUMENT WHEN PRESS TO
TEST BUTTON IS OPERATED. MAKE SURE TO EARTH CIRCUIT
UNDER TEST. ALWAYS CONNECT EARTH TERMINAL OF
INSTRUMENT TO EARTH. THE BUZZER WILL KEEP SOUNDING
DURING INSULATION RESISTANCE MEASUREMENT.
4-1. Mechanical Zero Adjustment
With the function switch set at OFF position, adjust the meter
pointer to “∞ mark ”on the scale. Use a screwdriver to turn the
zero adjust screw located at the center of the front panel.
4-2. Battery Check
With the function switch set at BATT. CHECK position, operate the
press to test button. The batteries are good when the pointer stays
in BATT. GOOD area or to the right of this area. If not, replace them.
Note: Refrain from holding down or locking the press to
test button during this test as it will result in current
consumption larger than insulation resistance
measurement while the batteries are still new.
4. Operating Instructions