Elma 1350B
side 11
7. Level Range Control Button
Each time the level button is pressed, the level range will change between “Lo” level,
“Med” level and “Hi” level in the circular manner.
8. Microphone
1/2 inch Electret Condenser microphone
9. AC Output Terminal
1 Vrms Corresponding to each range step.
Output impedance: 100 ohms
Output signal by standard 3.5mm coaxial socket signal on pin.
10. CAL Potentiometer
Calibration control , for level calibration adjustment.
11. Battery Cover
Calibration Procedures
Using a standard Acoustic Calibrator (94dB , 1KHz
Sinewave )
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.
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.
Signal
Ground
IEC 651 TYPE II
50
80
32
Med=
Hi =
Lo =
100 dB
130 dB
80 dB
LEVEL
SLOW
FAST
MIN
A / C
MAX
C
A
L
Screwdriver
Acoustic calibrator
