Sper Scientific 840018 Sound Level Meter Pen - Manual (Page 5)

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electrical calibration of the unit.
• The LCD displays "CAL" for about 1
second. As needed, use the calibration
tool to adjust the Calibration (CAL) VR
until "94.0dB" is displayed.
• This ends the calibration. Make sure
that the Measurement Slide Switch is
returned to the "MEAS" (up) position
and the Battery Cover is reattached.
2. Acoustic calibration using a standard
sound calibrator such as Sper Scien-
tific's 840031.
• With the Measurement Slide Switch in
the "MEAS" (up) position, place the mi-
crophone in the calibrator.
• As needed, use the calibration tool to
adjust the Calibration (CAL) VR until
"94.0dB" is displayed.
Measurement
1. Press the Power / Max Hold button to
turn the meter on.
2. Point the Microphone at the noise
source.
3. The LCD displays the measured sound
level. Readings are updated twice
every second.
• "OVER" is displayed when the sound