MEET Technology MS-931 User manual

Sound Level Meter
Microphone
LCD display
Frequency weighting A/C
selection button
MAX/MIN button
Range level slection button
Battery compartment
Model No.: MS-931
Thank you for purchasing MEET sound Meter
- Sound meter
- Operating manual
This Sound Level Meter is designed to meet the measurement requirements of safety engineers, health,
industrial safety offices and light quality control in various environments like factory, school,
construction stits, etc.
5. Descriptions
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2
3
4
5
6
7 9
1 2
4. Specifications
①
②
③
④
⑤
⑥
⑦
⑧
Power ON / OFF button
Response time
selection button
1. Contents
2. Introductions
3. Advanced Features
- High accuracy, fast response
- Frequency weighting : A and C
- Fast / slow time weighting
- Analog bar-graph display
- Over range indication
- MAX / MIN record reading
- LCD display with backlight
- Low battery indication
- Hold / Freeze reading
- Enable / Disable auto power off (APO)
Display 4 digits color LCD display
Measuring level range 30dB~130dB
Accuracy
Resolution 0.1
Operating Condition
Storage Condition
Battery Powered
-20ºC ~ 60ºC / -4ºF ~ 140ºF; 10% RH ~ 90% RH
-30ºC ~ 60ºC / -4ºF ~ 140ºF; 10% RH ~ 75% RH
1 x 9V (6F22 / 6LR61 / 1604)
≥ 30 hours
Battery Life
Demensions (L x W x D)
(approx.) mm 158x62x32
Weight (approx.) grams 178
Enable / Disable Auto power off The meter shuts off automatically after 15 minutes inactivity
under auto power off mode, disable auto power off is available
Data update 500ms
Dynamic range 50dB
Frequency range 31.5Hz~8KHz
±1.4dB
Frequency weighting A frequency weighting
Time weighting
Microphone
FAST : 125ms / SLOW : 1s
1/2 inch electrets condenser microphone
High / low reading indication >100dB, LCD displays “Hi” ; <100dB,LCD displays “LO”
Applied Standard IEC61672-1 CLASS2
F/S A/C

8. How to use
9. Notes
This meter has already been calibrated before delivery. Do not revise the calibration parameters
without professional personnel and device.
All products are well calibrated before delivery.Recommended recalibration at 1 year intervals.
Repairs or servicing not covered in this manual should only be performed by qualified personnel.
Wipe the unit with a dry soft cloth periodically. Do not use abrasives or solvents on this instrument.
Remove the battery when the meter is to be stored for long periods of time to avoid battery leakage.
When the battery is low, LCD display “ ” a new battery is needed to replace.
Do not store or operate the meter in high temperature or humidity.
Check whether the photo detector is well connected with the photo detector socket before
measurement.
When manual range is needed, press "LEVEL" key to select the desired range, if "UNDER" or
"OVER" icon appears on the LCD, which indicates incorrect range and need to select again.
Low range indication icon
MAX icon
MIN icon
Fast sampling time icon
Slow sampling time icon
Over range indication icon
Range indication
Analog bar-graph indication
Lux/Fc readings
Low battery icon
6. LCD display explainations
When the battery warning iocon ‘ ’
display on the LCD, Push the battery cover out
and replace 1 pc fresh 9V battery
as the correct polarity. To avoid chemical leakage
from the battery, remove the battery if you are
intended not to use the meter for a while
7. How to replace the battery
34
- Features and specifications are subject to change without prior notice.
Copyright © 2019 Meet International Ltd. All rights reserved www.meet.com.hk
②
1
③
④
⑤
⑥
⑦
⑧
Auto range icon
⑨
Hold / Freeze
readings icon
⑩
dBC icon
Auto power off icon
dBA icon
A)
B)
C)
D)
E)
F)
G)
H)
FAST SLOW
dBA dBC
1415
A)
B)
C)
D)
E)
F)
Power ON / OFF Function
press ‘ ’ button for one second, the meter will be on; keep pressing this button for approx. 3 seconds,
the meter will be off.
Backlight
After turning the meter on, momentarily press ‘ ’ backlit will be on / off, it will automatically turn off
after approx. 30 seconds of inactivity.
Data Hold
After turning the meter on, momentarily press ‘ ’ button, ‘HOLD’ icon will appear on the LCD,
which indicates the data is freezed. To release the held reading, press the button again.
Frequency weighting A/C selection
Press the ‘ ’ button to select ECT A or C.
dBA : A frequency weighting (the noise that human ear can hear)
dBC: C frequency weighting (response to machine monitor)
FAST/SLOW selection
After power the meter on, press “ ” to select FAST or SLOW measurement.
FAST: Fast sampling time measurement,1 time per 125ms
SLOW: Slow sampling time measurement, 1 time per second.
A/C
F/S
MAX/MIN
In the measurement mode, press ‘ ’ button one time, ‘ MAX ’ icon will appear on the LCD
to view the current MAX reading, press the button again, "MIN" icon will appear to view the current
MIN reading. Press this button once more to exit the ‘ MAX/MIN ’ mode.
Press ‘ ’ button for 3 seconds above, re-start to calculate the maximum or minimum.
Range selection
Press ‘ ’ button to select the range level, there are four selectable levels from ‘Lo’, ‘Med’, ‘Hi’, to ‘Auto’
in the circualr : Lo : 30dB~80dB
Med : 50dB~100dB
Hi : 80dB~130dB
Auto : 30dB~130dB
Before power on the meter, press ‘ ’ button first, then press ‘ ’ to disable auto power off
function
G)