Tenmars TM-101 Bedienungsanleitung

Rev.01

ENMAR

TM-101

SOUND LEVEL METER

User’s manual

-1-

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 IEC651 Type2, 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 quality control in various

environments.

□ Ranges from 30dB to 130dB at frequencies

between 31.5HZand 8 KHZ .

□ Display with 0.1dB steps on a 3 1/2 digits LCD.

□ With two equivalent weighted sound pressure

levels, A and C.

□ Both AC and DC signals output is available from

Both standard 3.5mm coaxial socket suitable for a

frequency analyzer, level recorder, FFT analyzer,

graphic recorder ; etc.

Specifications

1. Display: 3 1/2 digits LCD with maximum reading

1999,Resolution：0.1dB，Display Up data：0.5 sec.

2. Standard applied：IEC651 Type2, ANSI1.4 Type2.

3. Frequency range：31.5Hz ∼8KHz.

4. Measuring level range：30 ∼130dB.

5. Frequency weighting：A/C.

6. Microphone：1/2 inch Electret condenser microphone.

7. Time weighting：FAST(125mS),SLOW(1 sec).

8. Level ranges：LO ：30∼80dB.

Med ：50 ∼100dB,

Hi ：80 ∼130 dB.

-2-

9. Accuracy：±1.5dB.

10. Dynamic range：50dB.

11. Alarm function：”OVER” is show when input is

more than upper limit of

range. ”UNDER” is show when

input is Less than lower limit of

range.

12. MAX/MIN hold：Hold readings the Maximum and

Minimum value.

13. AC output ：1Vrms at FS(full scale).output

impedance：Approx.50Ω. FS：

means the upper limit of each level

range.

14. DC output：10mV/dB,

output impedance approx.100Ω.

15. Low Battery Indication: Replace battery as LCD

display “ ”.

16. Power Supply：9V NEDA 1604，IEC 6F22,JIS

006P battery×1pcs.

17. Power Life : About 30 hrs (alkaline Battery).

18. DC adapter：Voltage 9VDC(8~15VDCMax)

Supply current：＞30mADC.

Socket：pin Ground Casing Positive

External Diameter 3.5mm internal

Diameter 1.35mm

19. Operation temperature ＆Humidity ：5℃~40

℃,below 80﹪RH。

20. Storage Temperature＆Humidity：-10℃

~60℃,below 70﹪RH。

-3-

21. Dimension:

280mm(L)x80mm(W)x32mm(H).

22. Weight: About 300g. (Including batteries)

23.Accessories: Instruction manual、carrying

case 、9V Battery、

Screwdriver、3.5φplug。



Name And Functions

1.Windscreen

If you operate at wind speed over 10m/sec, please put

protective accessories in front of the microphone.

2.Display

3.power switch

The key turns the sound level meter ON or OFF

4.MAX/MIN hold switch

Press button to enter the maximum and minimum

recording mode. Select the proper Level range before

using MAX/MIN to ensure that reading value will not

exceed the measurement range. Press once to select

MAX value. Press again to select MIN vale,

annunciator blinking.

Press and hold down button for 2 seconds to exit the

MAX/ MIN mode。

Sampling rate：160ms。

Level range control switch

Each time the UP switch is pressed. The lever range

increments from “LO” Level range.

Each time the DOWN switch is pressed. The range

decreases from “Hi” Level to “LO” Level range.

Frequency Weighting select switch

A：A-Weighting. For general sound level

measurements.

-4-

C：C-Weighting. For checking the low-frequency

content of noise.

(If the C-Weighted level is much higher than the

A-weighted level, then there is a large amount of

low-frequency noise)

Time weighting select switch.

FAST：for normal measurements.

SLOW：for checking average level of fluctuation

noise.

Microphone

1/2 inch Electret Condenser microphone.

CAL potentiometer

Calibration control, For level calibration adjustment.

AC output terminal

1Vrms corresponding to each range step.

Output impedance≒50Ω

Output signal by standard 3.5mm coaxial socket signal

on pin.

DC output terminal

Output：10mV/dB

Output impedance≒100Ω

Output signal by standard 3.5mm coaxial socket signal

on pin.

External DC 9V power supply terminal

For connection with AC adapter.

Tripod mounting screw.

Battery cover

Calibration procedures

Using a standard Acoustic Calibrator(94dB,1KHz Sine

wave)

(1) Make the following switch settings.

Display：dBA

Time weighting：FAST

Measurement mode：MAX MIN Mode function

disable. Level range：50 to100dB

-5-

(2) Insert the microphone housing carefully into the

insertion hole of the calibrator.

(3) Turn on the switch of calibrator and adjust the

CAL potentiometer of the unit. The level display

will indicate the desired level. Our products are

all well calibrated before shipment.

Recommended Recalibration cycle：1 year.

Measurement Preparation

(1)BatteryLoading

Remove the battery cover on the back and put in

one 9V Battery.

(2) Battery Replacement When the battery voltage

drops below the operating voltage, mark appears. If

it appears, battery should be replaced with new one.

(3) AC Adapter Connection When the AC adapter is

used, insert the plugs of the adapter into the DC9V

connector on the side panel.

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. To achieve more accurate measurement, use an

extension cable to separate the Microphone

from the main body so that the effect of

unexpected sound reflection can be eliminated.

3. Calibrate the instrument before operation if the

instrument was not in use for a long time or

operation at bad environment.

4. Do not store or operate the instrument at high

temperature and high humidity environment.

5. Keep microphone dry and avoid severe

vibration.

6. Please take out the battery and keep the

instrument in low humidity environment.

When not in use.

-6-

 Measurement

1.Open battery cover and install a 9 Volt battery in

battery compartment.

2.Turn on power and select the desired response Time

and weighting. If the sound source

consists of short bursts or only catching

sound peak, set response to FAST. To

measure average sound level, use the slow

setting. Select A weighting for general

noise sound level and C weighting for

measuring sound level of acoustic

material.

3.Select desired Level

4.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.

5.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. Press the

MAX/ MIN button 2 seconds to clear the

MAX / MIN reading. “MAX” or ” MIN”

symbol disappears.

6.Turn OFF the instrument and remove battery

when not in use.



NAME AND ADDRESS OF

MANUFACTURE

TENMARS ELECTRONICS CO., LTD.

TAIPEI OFFICE:

6F, 586, RUI GUANG ROAD, NEIHU, TAIPEI,

TAIWAN

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