Center 326 User manual
326-00 OCT. 2003
CONTENTS
Title Page
1. Safety Information………………………….. 1
Environment Conditions………………………………….1
Maintenance & Clearing………………………………….1
Safety symbols……………………………………………1
2. Description ……………….….……………… 2
3. Features……………………..…..…………….2
4. Specifications………..……..………………..2
Output sound pressure levels…………………………...2
Output frequency………………………………………….2
Reference conditions……………………………………..2
Influence of ambient conditions…………………………2
Total Harmonic Distortion(THD)…………………………2
Accuracy of sound pressure level……………………… 2
Power………………………………………………………2
Battery life………………………………………………….2
Battery test ………………………………………………..3
Dimensions………………………………………………..3
Weight……………………………………………………...3
Ambient conditions………………………………………. 3
Storage temperature & humidity………………………...3
Accessories………………………………………………..3
5. Nomenclature And Function.……………...4
6. Operating Preparation…….….…………….5
7. Calibration Procedure….…….……………..5
Sound Level Calibration
1
1. 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.
Environment Conditions
Altitude up to 2000 meters
Relative humidity 90% max.
Operation Ambient 0 to 40℃
Maintenance & Clearing
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 instrument.
Safety symbols
Comply with EMC
When servicing, use only specified replacement
parts.
2. Description
Sound level calibrator is used to calibrate sound
level meters and other sound measurement
equipment. You can calibrate 1 inch diameter
microphones directly and 1/2 inch microphones
using 1/2 inch adaptor supplied with the calibrator.
With available adaptors, you can calibrate other
microphones and instruments.
Sound Level Calibration
2
3. Features
Conforms to ANSI S1.4-1984 and IEC
60942-2003 Class 2.
Calibration levels of 94dB and 114dB.
Fit 1 inch and 1/2 inch diameter microphone.
4. Specifications
Output sound pressure levels:
94dB and 114dB re 20 uPa under reference
conditions.
Output frequency: 1000Hz +/- 2%
Reference conditions:
Temperature :23℃(74℉)
Relative humidity: 50%
Atmospheric pressure: 1013hpa
Influence of ambient conditions:
Temperature coefficient: 0.005dB/℃
Humidity coefficient: 0.005dB/%RH
Total Harmonic Distortion(THD): <3%
Accuracy of sound pressure level: +/- 0.5dB
Power: one 9V battery 006P or IEC 6F22 or
NEDA 1604.
Battery life: approx.40 hours.(Alkaline Battery )
Battery test:
Internal circuitry checks condition of battery
continuously.
Sound Level Calibration
3
Calibrator will not be operated when green LED
turns to red LED, which means that battery
voltage falls bellow acceptable range.
Dimensions:
113(L)x63(W)x44(H)mm,4.4(L)x2.4(W)x1.7(H)inch
Weight: approx. 170g(including battery)
Ambient conditions:
0 – 40℃(32 – 140℉), 10 – 90%RH,
650 –1080hpa
Storage temperature & humidity:
-10 – 50℃(14 – 122℉) , 0 – 70%RH
Accessories:
Instruction manual, carrying case, 9V battery,
1/2”microphone adapter(CM 21).
Sound Level Calibration
4
5. Nomenclature And Functions
Power and low battery indicate LED.
Power and output level select switch.
Transducer assembly 1-inch cavity for
microphone insertion.
1/2-inch microphone adapter.
Battery cover.
94dB
114dB
ANSI S1.40 - 1984
IEC 60942 Class 2
OFF
NEDA 1604
9V BATTERY
6F22 , 006P
1
2
3
4
5
CENTER TECHNOLOGY CORP.
http
: / / www.centertek.com
326-00
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