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MODEL: GM1357

Digital Sound Level Meter

Operation Manual

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:

(Page 1)

(Page 2)

(Page 3)

1) Below 2,000 Meters in height
2) Humidity <80% RH

3) Operation temperature: 0-40

C

.

Operation Environment Condition:

Maintenance:

Use dry cloth to clean the unit but never with any 

solvent.

Figure 1

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

C. Calibration Procedures:

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.)

2  Insert the microphone carefully into the ½ inch

hole of the Calibrator.

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.

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