Tenmars TM-101 User manual

Rev.01
T
ENMAR
S
TM-101
SOUND LEVEL METER
User’s manual

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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.

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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。

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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.

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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

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(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.

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 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