7. REPLACEMENT OF BATTERY
1) When the left corner of LCD display show " BAT ", it 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) Slide the " Battery Cover " ( 3-11, Fig. 1 ) & take the
battery away from the battery compartment..
3 )Replace with 2 PCs 9V battery ( heavy duty type ) and
reinstate the cover.
8. CALIBRATION
The sound level meter is built in the internal calibration
" Calibration VR " ( 3-5, Fig. 1 ) on the front
panel. Please according the following procedures to
calibrate the instrument accurately, if it is necessary.
8-1 Calibrated via external SOUND CALIBRATOR
1 )Prepare the optional " SOUND CALIBRATOR ", such as
" SC-941 " or " SC-942 ". Power on the Sound
Calibrator & plug calibrator output into the " Electric
condenser microphone " head ( 3-1, Fig. 1 ) of the
Sound Level Meter.
2) Slide the " Range selector " ( 3-9, Fig. 1 ) to " 60 - 100
dB " position.
3) Slide " Time Weighting selector " ( 3-3, Fig. 1 ) to
" F " position.
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