31.2001 - Sound Level Meter TFA - Free user manual and instructions

Product Type	Sound Level Meter (Sonimètre)
Brand	TFA
Model	31.2001
Standards Applied	IEC61672-1 Class2, ANSI S1.4 Type2
Frequency Range	31.5 Hz – 8 kHz
Measuring Range	32 – 130 dB
Microphone	1/2 inch electret condenser microphone
Display	4-digit LCD with 0.1 dB resolution
Display Update Rate	0.5 seconds
Frequency Weighting	A
Time Weighting	FAST
Accuracy	±1.4 dB (94 dB @ 1 kHz reference)
Alarm Indication	OVER (above range) / UNDER (below range)
Power Supply	Two IEC R03 (AAA) batteries, 1.5V each
Battery Life	Approx. 50 hours (alkaline)
Operating Temperature	0°C to 40°C
Operating Humidity	10% to 90% RH
Storage Temperature	-10°C to 60°C
Storage Humidity	10% to 75% RH
Dimensions (L x W x H)	206 x 42 x 25 mm
Weight (with batteries)	100 g (0.22 lbs)
Accessories Included	Two 1.5V batteries, instruction manual, screwdriver, windscreen
Special Functions	Autoranging, Max Hold recording, internal calibrator (94 dB @ 1 kHz)
Maintenance	Wipe case with dry cloth; do not use abrasives or solvents
Safety & Repairability	CE compliant; repairs only by qualified personnel using specified parts

Frequently Asked Questions - 31.2001 TFA

How do I turn on the sound level meter?

Press the Max Hold button briefly to power on the unit. The LCD will display the current sound level.

How do I use the Max Hold function?

With the meter on, press the Max Hold button once. The LCD shows MAX and the meter captures the highest sound level detected. Press the button again to exit Max Hold mode.

How do I turn off the meter?

Hold the Max Hold button for at least 2 seconds until OFF appears on the display, then release.

What does 'OVER' or 'UNDER' mean on the display?

OVER indicates the input sound level is above the measurement range. UNDER indicates it is below the range. Adjust the range or measurement conditions accordingly.

How do I calibrate the meter?

Slide the switch on the rear to the CAL position (internal calibration). The LCD will briefly show CAL and activate a 1 kHz tone. After calibration, slide the switch back to MEAS.

What type of batteries does the meter use?

It uses two AAA (IEC R03) 1.5V batteries. Alkaline batteries are recommended for longest life.

How do I replace the batteries?

Press down on the battery cover and slide it downward. Insert the new batteries with correct polarity as marked inside the compartment, then replace the cover.

When should I use the windscreen?

Attach the windscreen over the microphone when measuring in windy conditions to reduce wind-induced noise errors.

What is the accuracy of this sound level meter?

The accuracy is ±1.4 dB under reference conditions (94 dB @ 1 kHz).

What frequency weighting does the meter use?

The meter uses A-weighting (dBA), which approximates the human ear's response. The time weighting is set to FAST.

USER MANUAL 31.2001 TFA

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.

Environment conditions

β Altitude up to 2000 meters

β Relatively humidity 90% max.

β Operation Ambient 0 \~ 40°C

Maintenance & Clearing

β 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 instruments.

Safety symbols

CE 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 IEC61672-1 Class2, 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.

III. FEATURES

β Mini size

β Easy to use

β High performance at a low cost

β Autoranging

β Maximum recording

β 4-digit LCD with a resolution of 0.1 dB

β Internal Calibrator (94dB@1kHz)

IV. SPECIFICATIONS

Standard applied: IEC61672-1 Class2, ANSI S1.4 Type2

Frequency range: 31.5Hz \~ 8KHz

Measuring level range: 32 \~ 130dB

Microphone: 1/2 inch electret condenser microphone

Display: LCD

Resolution: 0.1dB

Display Update: 0.5 sec.

Frequency Weighting: A

Time Weighting: FAST

Accuracy: ±1.4dB (under reference conditions, 94dB @ 1kHz)

Alarm function: "OVER" when input is more than upper limit of range.

"UNDER" when input is Less than lower limit of range.

Power supply: Two IEC R03 (size "AAA") batteries, 1.5V X2.

Battery Life: Approx. 50hrs (alkaline battery LR03)

Operation temperature: 0 to 40°C (32 to 104°F )

Operation humidity: 10 to 90%RH

Storage temperature: -10 to 60°C (14 to 140°F)

Storage humidity: 10 to 75%RH

Dimensions: 206 (L) × 42 (W) × 25 (H)mm

8. 1 ^ (L) × 1. 7 ^ (W) × 1. 0 ^ (H)

Weight: 100g (0.22 lbs) (including batteries)

Accessories: two 1,5V batteries, instruction manual, screwdriver, windscreen.

V. NAME AND FUNCTIONS

(1) Windscreen

When making outdoor measurements in windy weather, wind noise at he microphone can cause measurement errors. Such effects can be using the windscreen.

(2) Display

(3) Power On/Off & Max Hold button

Power On

Turn the unit on by press the "Max Hold" button.

Max recording mode

Press the “Max Hold” button to enter the Max Hold mode under the power-on. The LCD will show “MAX” symbol. The MAX recording mode captures and stores the maximum input values detected. When the unit detects an input that is above the recorded maximum, the unit recods the new maximum value.

Press the “Max Hold” button again to exit the MAX mode. Recorded values are erased, “MAX” symbol disappears.

Power-off

Turn the unit off by holding down the "Max Hold" button for at least 2 seconds. The LCD will show "OFF", release the button.

(4) Microphone

1/2 inch electret Condenser microphone

(5) Measurement / Calculation

Measurements or internal calibrator select switch

(6) Calibration adjustment

(7) Battery Cover

VI. MEASUREMENT PREPARATION

(1) Inserting the batteries

Lightly press the battery cover and slide it to the down. Insert two 1.5V batteries, paying attention to the polarity as indicated in the compartment. Replace the cover.

(2) Battery Replacement

When the battery voltage drops below the operating voltage, this

-+ symbol will appear.

Replace 1.5 Volt batteries.

V II. OPERATION PRECAUTIONS

(1) Wind blowing across the microphone will bring additional extraneous noise.
When using the instrument in the presence of wind, it is a must to mount the windscreen to not pick up undesired signals.
(2) Calibrate the instrument before the operation if the instrument was not in use for a long time or operated in bad environment.
(3) Do not store or operate the instrument at high temperature and high humidity environment.
(4) Keep microphone dry and avoid severe vibration.
(5) If the unit is not used for a long period of time, the batteries will have to be removed from the battery compartment, since it might leak.

VIII. CALIBRATION

Before starting a measurement, the unit must be calibrated. There are two types of calibration: internal electrical calibration and acoustic calibration using a sound calibrator. Normally, internal electrical calibration only is required.

Internal Calibrator (9dB @ 1kHz)

Lightly press the battery cover and slide it to the down. Slide the switch to the down. Verify that the Cal Mode is set to "Internal" CAL. LCD shows "CAL" approx. 1 sec. Activates the built-in oscillator (1 kHz, sine wave) for electrical calibration of the unit. When calibration is end, slide the switch to the up "MEAS" position.

IX. MEASUREMENT

(1) Turn the power ON to measure noise sound.
For general sound level measurements, A- - frequency weighting and F (FAST) time weighting (dynamic characteristics) the setting should be used.
(2) Make sure that slide the switch to the "MEAS" position on rear of the unit.
(3) Hold the instrument comfortably in hand and point the microphone at the suspected noise source.
(4) The numeric level indication shows the current measured sound level. The reading is updated twice every second.