UT350-1 Eng Manual.indd - UNI-T
Contents
1. UT351 352 SOUND LEVEL METER OPERATING MANUAL B Display Symbols see figure 2 18 entity poe Oika LI Moe 5 TRO 21 20 ql Mees ae figure 2 Overview Sound Level Meter Model UT351 and UT352 hereafter referred to as the Meter is a stable safe and reliable sound level meter The Meter is suitable to use in noise control quality control health care and all different kind of environmental noise testing For example factory road family musical instrument and all kind of places which need noise testing Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Item Description Qty 1 English Operating Manual 1 piece 2 Windscreen 1 piece 3 1 5V Batteries AA 4 pieces In the event you find any missing or damage please contact your dealer immediately Rules For Safe Operation Before using the Meter inspect the case and accessories Do not use the Meter if it is damaged LCD cannot display the case or part of the case is removed or you consider the Meter does not work properly Look for cracks or missing plastic When using the Meter must follow the instruction manual The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident Replace the battery as soon as the battery indicator Ea appears Turn the Mete2. around 1 second to turn the Meter off e HOLD feature During sound measure ment press once to freeze the current reading in the display Press the button again to resume normal operation AIC During sound measurement press AIC button to select A or C frequency weighting With A weighting selected the frequency response of the Meter is similar to the response of the human ear A weighting is commonly used for envi ronmental or hearing conservation programs C Weighting is a much flatter response and is suitable for the sound level analysis of machines engines etc Most noise measurements are performed using A Weighting and SLOW Response e For the Model UT352 press A C button also could recall and clear data gt RECALL 4 Press and hold this button the LCD displays the last data stored and the index number a Press vA button to recall additional stored reading aPress button to exit the RECALL mode gt CLR a Press and hold A C button when turning on the Meter until the LCD displays CLR and RECORD All the data stored will be cleared The Meter is default to auto ranging e Press LEVEL button to switch to manual ranging PressWAbutton to toggle from low to high range or from high to low range Press and hold LEVEL button to exit the manual ranging mode FAST Press to select a FAST 125ms or a SLOW LOW 1 second r
3. d hold MAX MIN button to disable or enable auto power off feature The Meter will automatically off after approximately 15 minutes of inactivity The G icon display indicates that the auto power off feature is active Calibration see figure 4 Turn the Meter on 2 Put the Meter in the A weighting mode FAST response mode range set to 60 110dB lock to MAX 3 Place the microphone onto the calibrator s 1 2 inches sound source hole 4 Turn the calibrator on using 94dB 1kHz standard sound source 5 Adjust the Meter s CAL potentiometer located on the side panel until the LCD displays 94 0dB 8 9 A Decibel dB Function Range Resolution Accuracy Remarks 30 80dB A Weighting and 50 100dB Frequency Response ae C Weighting a010 0 1dB 1 5dB 31 5 8kHz 80 130dB FAST Sampling Time 125 microsecond Sampling Rate SLOW Sampling Time 1 second Analogue Bar Graph 30 130dB 1 dB per scale Sampling time 200 times per second Overloading DC analogue signal Output impedance around Over range display OVER Under range display UNDER Has input terminal A Weighting and C Weighting selection A C RECALL CLR output 1000 10mV dB AC analogue signal Output impedance around Has input terminal output 600Q 0 707V each scale Power HOLD Turn on and off ae Meter and data holding LEVEL AUTO Selecting auto and manual ranging RECALL CLR features are fo
4. esponse time Select FAST to capture noise peaks and noises that occur very quickly Select the LOW response to monitor a sound source that has a consistent noise level or to aver age quickly changing levels Select LOW response for most application Press and hold FAST SLOW button to enable display backlight Press and hold FAST SLOW button again to disable display backlight For UT352 press FAST SLOW button to store data gt Press HOLD button to freeze data the LCD displays HOLD and M symbol and the data being stored gt Press FAST SLOW to store the data the symbol RECORD and the number of index blink for 0 5 seconds gt The Meter will automatically exit HOLD mode gt The Meter can store up to 63 data MAX Press MAX MIN to display the maxi MIN mum or minimum reading The display will update only when the measured value exceeds the value presently in the display gt Press the MAX MIN button and the MAX icon will display on the reading The reading displayed is the highest reading encountered since the MAX mode was entered Button Operation Performed Button Operation Performed LEVEL Press to selection of Auto ranging Manual MAX gt Press MAX MIN button again The MIN ranging MIN icon will appear on the display The read ing displayed is the lowest reading encountered since the MIN mode was entered gt Press the MAX MIN button again to exit the MAX MIN display mode Press an
5. install the screw Copyright 2008 Uni Trend Group Limited All rights reserved Manufacturer Uni Trend Technology Dongguan Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com 14
6. nal output Output impedance is around 100Q 10mV dB 2 AC Output Terminal AC analogue signal output Output impedance is around 600Q 0 707V each range scale 3 CAL potentiometer Calibration 4 External DC6V Using power adaptor DC6V output plug 3 5 to plug in the terminal It can use 4pcs of 1 5V batteries or power adaptor to power up the Meter International Electrical Symbols CE Conforms to Standards of European Union The Meter Structure see figure 1 BOKER ay scones scot oe aN A 558 3 Seen aN s see ee seat Se secs D Sen RIA ss ee es soss 23280 29202929S x BR ones 9 Sees 3 aX eee sears ses SS eres ses sears es BR Raas Eeee eee BE xt ogee 232 w eee caseees 3s eae saat eee w K SExy RSIS Ss es oe SRS z es z Ses oe es Z see s eae se w eee ae Ss Ss z 3 3 3 tot X ee SOIR LR LI Qs figure 1 A Meter Front 1 Housing 2 Windscreen 3 Microphone 4 LCD Display 5 Functional Buttons 6 Signal output and power terminals 3 Measurement Operation and Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed HOLD Turn the Meter on and off Press once to turn the Meter on Press and hold for
7. r model UT352 only Press to recall and clear data Selection of fast or slow and off FAST SLOW STORE feature is for model UT352 sampling rate and turn on STORE BL and off of display backlight only Press to store data Selection of maximum and MAX MIN Auto minimum value ranging Selection of auto power on 12 figure 4 Specifications A General Specifications Display 3 1 2 digits 1999 maximum Overloading Under range displays UNDER Over range displays OVER Battery Deficiency Change batteries as soon as EA is displayed Sampling Rate Fast Speed 125 microseconds Slow Speed 1 second Microphone 1 2 electret condenser Drop Test 1 meter pass Battery 4 x 1 5V batteries AA Battery Life Typical 20 hours continuous Dimension 273 x 69 x 39mm Weight around 386 g including batteries 10 Maintenance This section provides basic maintenance information including battery replacement instruction Anina Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not get water inside the case In order not to affect the Meter accuracy or damge to the Meter do not open the Meter housing A General Service Periodically wipe the case with damp cloth and mild de tergent Do not u
8. r power off when it is not in use and take out the battery when not using for a long time Do not use or store the Meter in an environment of high temperature humidity explosive inflammable and strong magnetic field The performance of the Meter may deteriorate after dampened No Meaning 1 Data Store is full 2 Date and Time display 3 Data Store 4 Decibel 5 C Weighting 6 A Weighting 7 Sound value display 8 Range display 9 Over range 10 Slow response 11 Fast response 12 Low battery display 13 Data Hold is on 14 Auto power off enabled 15 Under range 16 Analogue bar graph display 17 Symbol of Sound Pressure Level 18 Auto ranging enabled 19 Date display 20 Time display 21 Maximum value display 22 Minimum value display 23 Data Store enabled Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Meter from corrosion damage and accident Constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter Side Panel see figure 3 External DC6V DC Output Terminal ae AC Output Terminal CAL potentiometer figure 3 as DC Output Terminal DC analogue sig
9. se chemical solvent To clean the terminals with cotton tipped swab with de tergent as dirt or moisture in the terminals can affect readings Press the Meter power off when it is not in use and take out the battery when not using for a long time Do not store the Meter in place of humidity high tem perature explosive inflammable and strong magnetic field B Replacing the Battery see figure 5 figure 5 13 B Environmental Requirements For indoor use only Altitude 2000m Temperature and humidity gt Operating 0 C 30 C s80 R H 30 C 40C 75 R H 40 C 50 C lt 45 R H gt Storage 20 C 60 C lt 80 R H Safety Compliances EN61326 1997 A1 1998 A2 2001 A3 2003 EN61672 1 2002 Class 2 and IEC60641 1979 Type 2 ANSI S1 4 1983 Type 2 e Certification CE Accuracy Specifications Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity lt 80 A Temperature coefficient 0 1 x specified accuracy 1C 11 L imion To avoid false readings replace the battery as soon as the battery indicator i appears To replace battery 1 Press the Meter power off 2 Remove the screw from the battery compartment and then take out the battery door from the battery compart ment 3 Remove the battery from the battery compartment 4 Replace the battery with 4pcs new 1 5V AA batteries 5 Rejoin the battery door and the battery compartment and
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