Major tech MT975 User manual

INSTRUCTION MANUAL

MT975

SOUND LEVEL METER

1. 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:

Environment conditions

①Altitude lower than 2000 meters

②Relatively humidity ≤90％RH

③Operation Ambient 0 ~ 40°C

Maintenance & Clearing

①Repair or servicing are not covered in this manual

and should be performed by a technician.

②Periodically wipe the case with a dry cloth. Do not

use solvents or eradicator on this instrument.

Safety symbols

Comply with EMC

2. FUNCTIONS DESCRIPTION

This Sound Level Meter is designed for noise project;

quality control; illness prevention and cure and all kinds of

environmental sounds measurement. It is applied to the

sounds measurement at factory; school; office; traffic

access and household, etc.

This unit confirms to the IEC61672-1 CLASS2 for

Sound Level Meters.

MAX & MIN measurements

Over range display

Under range display

A & C Weighting

FAST & SLOW response

Analog AC/DC outputs for connection to frequency

analyzer or X-Y shaft recorder

3. SPECIFICATION

Standard applied: IEC61672 -1 CLASS2

Accuracy:±1.4dB

Frequency range:31.5HZ ~ 8KHZ

Dynamic range:50dB

Memory:32700

Level ranges: LO:30dB~80dB

Med:50dB~100dB

Hi:80dB~130dB

Auto:30dB~130dB

Frequency weighting: A/C

Time weighting: FAST ( 125ms ), SLOW ( 1s )

Microphone: 1/2 inch electret condenser microphone

Display: 4 digits LCD display with a resolution of 0.1dB

Display Update: 2 times/sec.

MAX hold: Hold the Maximum reading

MIN hold: Hold the Minimum reading

HOLD: Hold the readings

Alarm function: “OVER”is when input is more than upper

limit of range.“UNDER”is when input is

less than lower limit of range.

Analog output:AC/DC outputs from earphone outlet

AC=1Vrms ,DC=10mV/dB

Data output: USB data traffic

Auto power off:Meter automatically shuts down after

approx. 15 minutes of inactivity.

Power supply: One 9V battery, 006P or NEDA1604 or

IEC 6F22.

Power life:About 30hours

Operation temperature and humidity:

0°C~40°C,10％RH~90％RH

Storage temperature and temperature:

-10°C ~+60°C，10％RH~75％RH

Dimension:278 (L) x 76 (W) x 50(H) mm

Weight : 350g

Accessories: Instruction manual, battery, screwdriver,

￠3.5mm earphone plug, windscreen,

software, USB cable.

4. NAME AND FUNCTIONS

①Windscreen

DC 9V

OUTPUT

CAL

REC

FAST

A/C

②LCD：

SYMBOL FUNCTION

LCD 4 digits

MAX Maximum hold

MIN Minimum hold

OVER over range

UNDER under range

FAST Fast response

SLOW Slow response

dBA A-Weighting(responseto human sense)

dBC C-Weighting(response to machine monitor)

30—130 Range indicate

REC Recording data into computer

AUTO Auto level range selection

FULL Memory full

HOLD Data hold function

AutopoweroffPress the ”SETUP“ button to

disable power off

Low battery indicate

③REC button

3.0 DATALOGGER function

Press “REC” button once the power has been switched on,

the display will show “REC” to start Data Recording，press

the button again to exit the record (Note: In order to avoid

data error, please don’t power it off under REC condition,

when the REC function is deleted then it can power off).

3.1 Adjusting DATALOGGER response

Press the button continuously before power it on，then

press ,it will be displayed as following: Press ’LEVEL’

button to adjust memory time,press ‘HOLD’ button to hold

the setup；

3.2 Data zero function

Select the button continuously before power it on，loosen the

button when the display showing’CLR’ after the meter

power on,which indicates that the data in DATALOGGER

has been deleted.

④SETUP button

4.0. The time chip adjustment

Press‘SETUP’button and then power it on，when‘TIME’

symbol displays then loosen‘SETUP’， the meter will be

under time adjustment mode，at the time the display will

show the date as following:

Select the‘SETUP’button for a second time, the ‘hour

adjustment mode will be displayed：

Select ‘LEVEL’ to save the adjustment. Press the ‘HOLD’

function to save the setup;

Press the ‘SETUP’ button for a third time, the ‘hour’

adjustment mode will be displayed:

Press

(h-P =P.M,h-A=A.M)

‘LEVEL’ to make the adjustment，press‘HOLD’to save the

setup；

Press the‘SETUP’button for a fourth time, the ‘date’

adjustment mode will be displayed

Press

‘LEVEL’ to make the adjustment，press ‘HOLD’ to keep the

setup；

Press the ‘SETUP’ button for a fifth time, the ‘month’

adjustment mode will be displayed：

Press

‘LEVEL’ to make the adjustment，press ‘HOLD’ to save the

setup；

Press the ‘SETUP’ button for a sixth time, the ‘year ’

adjustment mode will be displayed:

Press

‘LEVEL’ to make the adjustment，press ‘HOLD’ to save the

setup:

Press the ’SETUP’ button for a seventh time, the ‘time’

adjustment mode will be displayed:

Press ‘HOLD’ to save the setup. The time and date will

return to the factory setup once the battery is flat or needs to

be replaced, if the time can’t be adjusted, initialize the time

chip first.

4.1. USB communications setting:

Turn on the meter, connect the unit to the computer. Select

the software COM3（COM4）. Press ‘SETUP’ and will

disappear from the display to indicate and disable auto

power off, that the USB data will start transmitting.

⑤FAST/SLOW button:

Time weighting selection

FAST: fast sampling measurement, 1 time per 125mS.

SLOW: slow sampling measurement, 1 time per second.

⑥MAX/MIN button:

Select the Maximum and Minimum hold button for once to

enter the MAX/MIN measurement, ‘MAX’ will be displayed

on the LCD screen. Maximum sound level will be captured

and held a until higher sound level is captured. Press the

button again, ‘MIN’ will appear on the LCD screen and the

minimum sound level will be captured and held until a

lower sound level is captured. Press the button one more

time to exit MAX/MIN measurement.

⑦LEVEL button: Level range selection

Each time you press “LEVEL” button, the level range will

change between ‘Lo’ level, ‘Med’ level, ‘Hi’ level and ‘Auto’

level in that sequence.

⑧Backlight button

8.0．Turn the backlight on/off

8.1．DATALOGGER response setting;

Press the button continuously until‘INT’symbol appears.

Press‘LEVEL’to set up the data memory response and

press‘HOLD’to savethe setting.

⑨Frequency weighting select button

A：A-Weighting

C：C-Weighting

⑩HOLD button:

Press “HOLD” button, The hold function freezes the

reading in the display.

⑾Power button

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