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7. REPLACEMENT of BATTERY
1) When the left corner of LCD display show "
is necessary to replace the battery. However, in-spec.
measurement may still be made for several hours after
low battery indicator appears before the instrument
become inaccurate.
2) Open the " Battery Cover " ( 3-15, Fig. 1 ) away from the
instrument by loosing the " Battery Cover Screws " ( 3-12,
Fig. 1 ) and remove the batteries.
3) Replace the batteries ( DC 1.5V, UM4/AAA type, 6 PCs )
and reinstate the cover.
* Please make attention the polarity of the battery.
4) Make sure the battery cover is secured after
changing the battery.
8. CALIBRATION
1) Prepare the optional " SOUND CALIBRATOR ", such as "
SC-941 " or " SC-942 ". Power on the Sound Calibrator &
plug calibrator output socket into the " Microphone " head (
3-1, Fig. 1 ) of the Sound Level meter.
2) Select manual range to " 50 - 100 dB ".
3) Select " Time Weighting " at " Fast " position.
4) Select " A " weighting.
5) Adjust the " Calibration VR " ( 3-17, Fig. 1 ) carefully
with a " - " screw driver until the display reading value
within " 94 +/- 0.2 " dB.
20
", it
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