Galaxy Audio CM-140 User Manual

CM-140

Instruction

Manual

GALAXY AUDI O

GALAXY AUDI O

CE

GCBC CM140-12000

SOUND LEVEL METER

CONTENTS

TITLE PAGE

I. Safety Information………………………….. 1
II. General Description.…………………...…1-2
III. Specifications……………..……………… 2-3
IV. Name and Functions…………………….. 4-5

V. Calibration Procedures………..………... 6-7
VI. Measurement Preparation……..……….… 7
VII. Operating Precautions………..…………. 7-8
VIII. Measurement………………………………... 8

CM-140 SPL METER

I. Safety Information

Read the following safety information carefully before
attempting to operate or service the meter.
Use the meter only as specified in this manual; otherwise,
the protection provided by the meter may be impaired.

Ø Environment Conditions
ΠAltitude up to 2000 meters
 Relative humidity 90% max.
Ž Operation Ambient 0 to 40

Ø Maintenance & Clearing
ΠQualified personnel should only perform repairs or

servicing not covered in this manual.

 Periodically wipe the case with a dry cloth. Do not use

abrasives or solvents on this instrument.

Ø Safety symbols

Comply with EMC
When servicing, use only specified replacement

parts.

II. General Description

Thank you for using our Sound Level Meter. To ensure that
you can get the most from it, we recommend that you read
and follow the manual carefully before use.
This unit conforms to the IEC651 type2, ANSI S1.4 Type2
for Sound Level Meters.
This Sound Level Meter has been designed to meet the
measurement requirements of safety engineers, health,
industrial safety offices and sound quality control in
various environments.

q Range from 32dB to 130dB at frequencies between

31.5Hz and 8 KHz.

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CM-140 SPL METER

q Display with 0.1dB steps on a 4-digit LCD.
q Two equivalent weighted sound pressure levels, A and

C.

q AC signal output is available from standard 3.5mm

coaxial socket suitable for a frequency analyzer, level
recorder, FFT analyzer, graphic recorder, etc.

III. Specifications

Standard Applied: IEC651 Type2, ANSI S1.4 Type2.
Frequency Range: 31.5Hz to 8KHz
Measuring Level Range: 32dB to 130dB
Frequency Weighting: A / C
Microphone: 1/2-inch electret condenser microphone
Display: LCD
Digital Display: 4 digit
Resolution: 0.1dB
Display Update: 0.5 sec.
Time Weighting: FAST (125mS), SLOW (1 sec.)
Level Ranges: Lo: 32 dB to 80 dB

Med: 50 dB to 100 dB
Hi: 80 dB to 130 dB

Accuracy:
±1.5dB ( under reference conditions, 94dB@1kHz )

Dynamic Range: 50 dB
Alarm Function: “OVER” is when input is more than

MAX / MIN Hold:
Hold readings the Maximum and Minimum Value.

upper limit of range.
“UNDER” is when input is less than lower

limit of range.

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