Benetech GM1357 Operation Manual

Digital Sound Level Meter
Operation Manual
MODEL: GM1357
(Page 1)
A. Introduction
This equipment has been designed to meet
measurement requirement of Safety Engineers,
Health, Industrial Safety office and Sound
Quality control in various environment which
include factory, office, traffic, family and audio
system
This equipment has the following functions:
1.It is design according to IEC651 TYPE2 &
ANSI S1.4 TYPE2
2.Accuracy up to ±1.5dB
3.Measurement range: 30dB – 130 dB
4.With two equivalent weighted sound pressure
levels, A and C
5.Fast & Slow dynamic characteristic modes
6.AC and DC output for frequency analyzer level
recorder, FFT analyzer, Graphic recorder etc.
B. Safety Notice:
Operation Environment Condition:
1) Below 2,000 Meters in height
2) Humidity <80% RH
3) Operation temperature: 0-40C.
Maintenance:
Use dry cloth to clean the unit but never with any
solvent.
C. Calibration Procedures:
Figure 1
(Page 2)
Please use a Standard Acoustic Calibrator.
1. Make the following settings:
1.1 Equivalent weight: SPL (dBA)
1.2 Time weighting: FAST
1.3 Level range: 60 to 110 dB
1.4 Measurement mode: MAX function disable
2 Insert the microphone carefully into the ½ inch
hole of the Calibrator.
3 Turn on the Calibrator and adjust the potentiometer
inside the battery compartment of the unit
(shown in the Figure1), until the LCD display the
desire level (94 dB)
*Our products are all well calibrated before shipment.
(Recommended recalibration cycle:1 Year.)
D. Name and functions (Figure 2)
1. Electret Condenser Microphone.
2. LCD Display.
3. Power switch
4. Level range control switch:
30dB~80dB; 50dB~100dB 60dB~110dB;
80dB~130dB; 30dB~130dB;
5. Maximum value hold switch. (MAX)
6. Frequency weighting select switch.
A: A weighting for general sound level measurements.
C: C weighting for checking the low frequency content
of noise.
(Page 3)