protech QM1591 User manual

Micro Sound Level Meter
QM1591
User Manual

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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.
l Environment conditions
1 Altitude up to 2000 meters
2 Relatively humidity 90% max.
3 Operation Ambient 0~40℃
l Maintenance & Clearing
1 Repairs or servicing not covered in this manual should
only be performed by qualified personnel.
2 Periodically wipe the case with a dry cloth. Do not use
abrasives or solvents on this instruments.
l Safety symbols
Meter is protected throughout by double insulation or
reinforced insulation.
When servicing, use only specified replacement parts.
Comply with EMC
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.

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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.
l Ranges from 40dB to 130dB at frequencies between
31.5Hz and 8 KHz.
l Display with 0.1dB steps on a 4-digits LCD.
l With one equivalent weighted sound pressure level A.
Ⅲ
. Specifications
Frequency range : 31.5Hz~8KHz
Measuring level range : 40~130dB
Frequency weighting : A
Microphone : 1/2 inch electret condenser microphone
Display : LCD
Digital display : 4 digits
Resolution: 0.1dB
Display Up data: 0.5 sec.
Time weighting : FAST(125mS)
Accuracy: + 3.5dB @1kHz, 94dB under reference conditions
Alarm function : “OVER” is show when input is out of
range(>130dB)
Auto power off : Meter automatically shuts down after
approx. 15 minutes of inactivity.

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Power supply : One 9V battery, 006P or IEC 6F22
or NEDA 1604.
Operation temperature : 0 to 40℃(32 to 104oF)
Operation humidity : 10 to 90%RH
Storage temperature : -10 to 60℃( 14 to 140 oF)
Storage humidity : 10 to 75%RH
Dimensions : 210(L)X55(W)X32(H)mm
135g (including battery)
Weight : 9V battery, carrying case,
Instruction manual..
IV. N a me a nd Func t ion s
① Windscreen & 1/2 inch Electret Condenser microphone
If you operate at wind speed over 10m/sec, please put
protective accessories in front of the microphone.

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②
MAX/MIN button MAX
The max. Hold position is used to measure the maximum
level of sounds. The maximum measured level is up dated
continuously. Press once again the button, will release the
hold and allow a further measurement.
③
Power ON/OFF button
Turn the meter power ON/OFF
④
Backlight Sensor
Automatic Turn the meter Backlight ON/OFF
⑤
Digital LCD display
4 digits,Resolution: 0.1dB,Display Up data: 0.5 sec.
⑥
Battery Cover
Open the battery cover to replacing new one 9V battery.
⑦
Tripod nut
Hold the instrument comfortably in fix on tripod
V. Measurement Preparation
(1) Battery loading
Remove the battery cover on the back and put in one
9V Battery.

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(2) Battery Replacement
When the battery voltage drops below the operating
voltage, mark “BAT” appears. If it appears, battery
should be replaced with new one.
VI. Operating Precautions
(1) Wind blowing across the microphone would bring
additional extraneous noise.
Once using the instrument in the presence of wind, it is
a must to mount the windscreen to not pick up
undesirable signals.
(2) Do not store or operate the instrument at high
temperature and high humidity environment.
(3) Keep microphone dry and avoid severe vibration.
(4) Please take the battery and keep the instrument in low
humidity environment. When not in use.
VII. Measurement
(1) Open battery cover and install a 9-volt battery in the
battery compartment.
Turn on power.
(2) Hold the instrument comfortably in hand or fix on tripod
and point the microphone at the suspected noise source,
the sound pressure level will be displayed.

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(3) When MAX/MIN (maximum/minimum hold) mode is
chosen. The instrument captures and holds the
maximum or minimum noise level for a long period
using any of the time weightings and ranges.
(4) Turn OFF the instrument and remove and remove
battery when not in use.
Distributed by:
Electus Distribution Pty. Ltd.
320 Victoria Rd, Rydalmere
NSW 2116 Australia
www.electusdistribution.com.au
Made in China