Page 1
,
Sound Level Calibrator
ST-120 CLASS 1
User’s Manual
TENMARS ELECTRONICS CO.
LTD
Page 2
Page 3
Contents:
1. INTRODUCTION.................................................... 2
2. EQUIVALENT FREE-FIELD ..................................2
3. SPECIFICATIONS ................................................. 3
4. OPERATING INSTRUCTIONS ..............................4
5. CALIBRATION AND ADJUSTMENT ..................... 5
6. BATTERY REPLACEMENT................................... 5
7. CLEANING............................................................. 6
8. END OF LIFE ......................................................... 6
9. ENVIRONMENT CONDITIONS .............................6
10.EMC ......................................................................7
11.ACCESSORIES ....................................................7
Page 4
ST-120
1. INTRODUCTION
The ST-120, Sound Level Calibrator, is used for the
calibration of the pressure sensitivity of the microphone
and sound level measuring equipment. The design of
ST-120 is based on a feedback arrangement to ensure
a high stable sound pressure level. The performance is
very stable; it does not required for the revision to the
microphone equivalent volume. ST-120 conforms to the
standard of IEC60942 (2003) Class 1.
2. EQUIVALENT FREE-FIELD
Usually we use the free-field microphone more than
others. For example, when use the ST-120 to calibrate
the sound level meter and other environmental noise
measuring equipments need to revise the pressure-field
to the equivalent free-field. The corrected value is the
difference between the pressure-field response and freefield response when at 1000Hz. The value for the
23.77mm (1 inch) microphone is –0.4dB, and for the
12.7mm (1/2 inch) microphone is –0.2dB.
Also the equivalent free-field for the 23.77mm (1 inch)
microphone is 93.6dB, and for the 12.7mm (1/2 inch)
microphone is 93.8dB.
2
Page 5
ST-120
3. SPECIFICATIONS
● Standard : IEC 60942(2003) and ANSI S1.40. (1984)
● Sound Pressure Levels : 94 and 114Db.
-5
（reference of 2x10
● Accuracy : 94 ± 0.3dB and 114 ± 0.5dB.
● Frequency : 1000Hz ± 1%.
● Distortion : ≤ 3 %.
● Battery : 9V 006P or IEC6F22 or NEDA 1604.
● Dimension :φ62x134（mm）.
● Weight : about 350g（included 1/2" adaptor and 9V
Pa）.
battery）.
● Stable Times : 20s.
● Operating Temperature : 0 ℃ ~ 40 (℃ 32 ~ 1℉ 04 ).℉
● Storage Temperature : -10 ~ ℃ 60 (℃ 14 ~ 1℉ 40 ).℉
● Humidity :＜90%.
● Atmospheric Pressure : 65KPa~100KPa
● Accessories : User’s manual x1、Calibration certificate x1
3
Page 6
ST-120
4. OPERATING INSTRUCTIONS
1. Insert the 1/2 inches microphone to the hole of ST120
Sound Calibrator until you hear a "click" sound. (refer to
Fig. 1)
2. Select output dB level and turn on power, LED will be
lightened and the meter emits a sound.
3. Read the value on the sound level meter’s display and
perform the calibration
4. Extract the microphone.
Fig. 1
4
Page 7
ST-120
5. CALIBRATION AND ADJUSTMENT
If calibration out of specification, you can calibrate and
adjustment it:
1. Unscrew completely the metal silver battery cover.
2. Uses a small screw driver trimming interior variable
resistor(VR1) until attain a designated standard the
accurate 94dB normal value.
CAUTION
When verification should use the pressure field
response laboratory scale microphone as well as the
precision measurement amplifier carries on the
measuring. Does not need to 114.0dB to carry on
the adjustment.
6. BATTERY REPLACEMENT
CAUTION
The battery voltage should maintain more than
7V,when the LED flash, please change battery
soon.
CAUTION
If you not use this product for a long time ,
please remove battery
1. Unscrew completely the metal silver battery cover.
2. Remove the battery.
3. Replace the battery with a new one of the same type.
5
Page 8
ST-120
Description Of
Calibrator
1. Power & output
level select
switch .
2. Low battery
indicator .
3. Battery cover.
4. 1/2" adapter.
Fig. 2
7. CLEANING
z To clean the instruments use a soft dry cloth. Never use a
wet cloth, solvents or water.
8. END OF LIFE
Caution: this symbol indicates that equipment and its
accessories shall be subject to a separate collection
and correct disposal
9. ENVIRONMENT CONDITIONS
z For inside use, max height: 2000m
z Reference temperature: 23° ± 3℃
z Operation temperature: 5 ~ 40 ℃
z Operation humidity: <80% RH
z Storage temperature -10 ~ 60 ℃
z Storage humidity <70%
6
Page 9
ST-120
10. EMC
This instrument was designed in accordance with EMC
Standards in force and its compatibility has been tested in
accordance with EN61326-1 (2006).
11. ACCESSORIES
z Meter: ST-120.
z User’s manual.
z Carrying case.
z 1 battery 9V 006P or IEC6F22 or NEDA 1604.
7
Page 10
Page 11
Professional Electrical and Environment
Test & Measurement Instruments:
Battery Capacity / Impedance Tester/
LED light meter, Temperature & Humidity meter
Infrared Thermometer, Sound level meter
Light meter, EMF meter, UV Light meter, RF meter
Hot wire Anemometer, CO meter
Anemometer, Lan cable tester, CO
Solar power meter, Radiation meter,
Clamp meter, Multimeter
Phase Rotation tester, Digital Insulation tester
TACHO Meter
meter
2
Our products of high quality are selling well
all over the world
TENMARS ELECTRONICS CO., LTD
6F, 586, RUI GUANG ROAD, NEIHU,
TAIPEI 114, TAIWAN.
E-mail: [email protected]
http://www.tenmars.com
Loading...