12
5. CALIBRATION PROCEDURES
①
Make the following switch settings:
Frequency weighting: A-weighting
Time weighting: FAST
Level range: 50 ~100dB
②
Insert the microphone housing carefully into the 1/2
inch insertion hole of the calibrator
（
94dB @ 1kHZ
）
.
③
Turn on the switch of calibrator and adjust the CALL
potentiometer of the unit 94.0dB is displayed.
NOTE: All products are well calibrated before shipment.
Recommended recalibration cycle: 1 year.
6. MEASUREMENT PREPARATION
①
Remove the battery cover on the back and put in
one 9V battery.
②
Recover the back cover.
③
When battery voltage drops below the operating
voltage or battery aging, this symbol will
appear on LCD. Replace the 9V battery.
④
When the AC adapter is used, insert the plug of the
adapter
（
3.5φ
）
into the DC 9V connector on the
side panel.
Acoustic Calibrator
REC
FAST
A/C
DC
9
V
O
U
T
P
U
T
C
A
L
