Galaxy Audio CHECK MATE CM-140 - Manual (Page 9)

(1) Make the following switch settings.
Display: dBA
Time Weighting: FAST
Measurement Mode: MAX/MIN Mode function disable.
Level Range: 50 to 100dB
(2) Insert the microphone housing carefully into the
insertion hole of the calibrator.
(3) Turn on the switch of calibrator and adjust the CAL
potentiometer of the unit. The level display will indicate
the desired level.
All our products are well calibrated before shipment.
Recommended Recalibration cycle: 1 year.
VI. Measurement Preparation
(1) Battery Loading
Remove the battery cover on the back and put in one 9V
Battery.
(2) Battery Replacement
When the battery voltage drops below the operating
voltage, this symbol will appear.
Replace 9 Volt battery.
VII. Operating Precautions
(1) Wind blowing across the microphone will bring additional
extraneous noise.
When using the instrument in the presence of wind, it is a
must to mount the windscreen to not pick up undesired
signals.
(2) Calibrate the instrument before operation if the instrument
was not in use for a long time or operated in bad
environment.
humidity environment when not in use.
CM-140 SPL METER
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