Galaxy Audio CM-160 User Manual

TITLE PAGE

I. Safety Information………………………….1

Environmental operating conditions..………1

Maintenance & Cleaning……...………….....1

Safety symbols……………………………… 1

II. General Description.…………………...…..1
III. Specifications……………..………………...2

IV. Names and Functions CM-150 ……….....3

V. Auto Power Off................................6

VI. Names and Functions CM-160.........7

VII. Data Logger Clock & Internal Setup........ 10

VIII. Calibration Procedures..……..………....... 1 1

IX. Measurement Preparation……..……….… 12
X. Operating Precautions………..…………... 12
XI. Measurement……………………………….. 13
XII. Setup Test Link SE-322
(Sound Level Meter) USB

Interface software............................................. 13

Tutorial - Quick Start to

Use SE322 Test Link........................................ 17

Frequently Asked Questions.......................... 20

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.

Environmental operating conditions

§Altitude up to 2000 meters

§Relative humidity 90% max.

§Ambient Operating Temperature 0 ~ 40ºC

Maintenance & Cleaning

§Repairs or servicing not covered in this manual should only be
performed by qualified personnel.

§Periodically wipe the case with a dry cloth. Do not use abrasives or
solvents on this instrument.

Safety symbols
Complies with EMC

CE

When servicing, use only specified replacement parts.

II. GENERAL DESCRIPTION

Thank you for using the Galaxy Audio Checkmate SPL meters. To ensure
that you can get the most from them, we recommend that you read and follow
the manual carefully before use.
These units conform to the IEC651 type2 and ANSI S1.4 Type2 for
Sound Level Meters.
internal memory can store up to 32000 records.(Note 1.)
It uses a USB interface to perform bi-directional communication with a
PC.

Note1:

Every time you press the “REC” button to start recording data and press the “REC” button
again to stop recording, there will be a data set placed in memory You can store as many
data sets as you want until the memory is full.

The CM 160 Data Logger Sound Level Meter’s

III. SPECIFICATIONS

Standard applied: IEC651 Type2, ANSI S1.4 Type2.
Frequency range: 31.5Hz ~ 8KHz
Measuring level range: 30 ~ 130dB
Frequency weighting: A / C
Microphone: 1/2 inch electret condenser microphone
Display: LCD
Digital display: 4 digits
Resolution: 0.1dB
Display Update: 0.5 sec.
Analog display: 50 segment bar graph
Resolution: 1dB
Display Update: CM-150 100 mS
CM-160 50 mS
Time weighting: FAST (125mS), SLOW (1 sec.)
Level ranges: Lo: 30 – 80 dB
Med: 50 – 100 dB
Hi: 80 – 130 dB
Auto: 30 – 130 dB
Accuracy: 1.5dB (under reference conditions @ 94dB, 1KHz)
Dynamic range: 100 dB
Alarm function: “OVER” is when the input is more than upper limit of range.
“UNDER” is when the input is less than lower limit of range.
MAX/MIN hold: Hold readings of the Maximum and Minimum Values.
AC output: 1 Vrms at FS (full scale).
Output impedance: Approx. 100
FS: means the upper limit of each level range.
DC output: 10mV / dB, output impedance approx. 1K
Power supply: One 9V battery, 006P or IEC 6F22 or NEDA 1604.
Power life: About 50hrs (alkaline battery)
AC adapter: Voltage 9 VDC (8-15VDC Max)
Supply current : > 30mADC Socket : pin Ground
Casing Positive External Diameter 3.5mm
Internal Diameter 1.35mm

±

Ω

Ω

Z

Z Z

Z

Electromagnetic Compatibility:
RF field = 3V/m
Total accuracy = specified accuracy + 0.5dB
Operation temperature: 0 to 40ºC ( 32 to 104ºF )
Operation humidity: 10 to 90%RH
Storage temperature: -10 to 60 ( 14 to 140 )
Storage humidity: 10 to 75%RH
Dimensions : 275 (L) x 64 (W) x 30 (H)mm

10.8 (L) x 2.5 (W) x 1.2 (H)inch
Weight: 285g (including battery)
Included Accessories: 9V battery, carrying case, screwdriver, instruction
manual, windscreen, 3.5 mm plug, software, and USB cable.
(Software, USB cable not included with CM-150).

ºC ºF

IV. NAME AND FUNCTIONS CM-150

Windscreen

If you operate at wind speeds over 10m/sec, install the windscreen
onto the meter’s microphone.

Display

SYMBOL FUNCTION

MAX Maximum value displayed

MIN Minimum value displayed
Over range
Under range
FAST Fast response
SLOW Slow response
dBA A-Weighting
dBC C-Weighting
Range Indicator
Low-Battery
Under range 20dB
AUTO Auto level range selected

Power & Backlight button

The key turns the CM-150 ON or OFF and the backlight ON & OFF.

¡

Press it once to turn on the CM-150.
Press it again for a moment to turn the backlight ON or OFF. .
Press and hold this button for 3 seconds to turn OFF the power.

MAX / MIN hold button

Select the proper level range before using MAX/MIN to ensure
that the reading value will not exceed the measurement range. Press
button to enter the maximum and minimum recording mode.
Press once to select MAX value. Press again to select MIN value,
and press again to select current value with “ MAX/MIN “ annunciator
blinking. Press and hold down button for 2 seconds to exit the
MAX/MIN mode.

Note: If the sound level range or A-C weighting is changed , the MAX/
MIN mode will clear.

Level range control switch

Each time the UP button is pressed, the range level is increased
from “ Lo ” Level to “ Hi “ Level to “Auto” Level.
Each time the DOWN button is pressed. The range level is
decreased from “Auto” Level to “ Hi ” Level to “ Lo “ Level.

Frequency Weighting select button

A: A - Weighting filters out low frequencies to approximate the response
of the human ear at lower SPL's.
C: C - Weighting filters less low frequencies to approximate the response
of the human ear at higher SPL's. (a flatter response.)

Time weighting select button

FAST: for normal measurements
SLOW: for checking average level of fluctuating noise.

Microphone

1/2 inch Electret Condenser microphone

CAL potentiometer

Calibration control for level calibration adjustment.

RS-232 Interface:

The USB signal output is a 9600 bps USB interface.

RX

TX

GND

Signal output terminal
AC: 1 Vrms Corresponding to each range step.

Output impedance = 100Ω
Output signal by standard 3.5mm mini stereo jack with signal on tip.
Note: At “Auto” level range, output signal is Auto select on “Lo” or
“Med” or “Hi” level range.

DC Signal

AC Signal Ground

DC: Output: 10mV/dB
Output impedance = 1KΩ
Output signal by standard 3.5mm mini stereo jack with signal on ring

External DC 9V power supply terminal

For connection with AC adapter.

Tripod mounting screw.

Battery Cover

V. AUTO POWER OFF

By default, when the meter is powered on, it is under auto power off
mode. The meter will shut itself off after 30 minutes if there is no key
operation, no USB communication, or no recording combination
selected at power up.
By pressing and holding the “FAST/SLOW” button and then turning on
the meter the will not show up, indicating that auto power off is
disabled.