Center 321 - Calibration Procedures; Measurement Preparation; Battery Loading and Replacement

SOUND LEVEL METER
7
OUTPUT
DC 9V
CAL
RS-232
IEC 651 TYPE II
POWER-UP OPTIONS
MIN
MAX
SLOW
FAST
LEVEL
Auto=
Hi =
Med=
Lo =
50
30
80
30
100 dB
130 dB
130 dB
80 dB
AC
VI. CALIBRATION PROCEDURES
 Using a standard Acoustic Calibrator
( 94dB , 1KHz Sine wave )
(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 products are well calibrated before shipment.
Recommended Recalibration cycle : 1 year.
VII . 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.
Acoustic Calibrator
Screwdriver