Extech Instruments 407780A - Operation Modes; Sound Level Meter Operation

407780A‐EU‐ENv1.34/14
7
Operation
Themeterhastwomodesofoperation,SoundLevelMetermodeandIntegratingSoundLevel
Metermode.
SoundLevelMetermeasurements
1. Pressthe buttontoswitchthemeterON.Theinitialstatedependsontheconditionsset
whenthemeterwaslastswitchedoff.
2. PresstheA/Cbuttontoselectthedesiredfrequencyweighting.
3. PresstheFAST/SLOW/IMPULSEbuttontoselectthedesiredresponsetime.
Note:Refertolocalstandardstoselect
theproperweightingandresponsetimeforthe
measurementstobeperformed.Requirementsvaryaccordingtocountryandtypeoftest.
OSHArequiresSlowandAweightformanyoftheirworkplacetests.
4. Usethe▲▼buttonstoselectthedesireddBrange.Chooseasettinginwhichthebar
graphindicationregistersapproximatelyinthemiddleoftherange.IftheOVERindicator
appearsduringameasurement,theupperlimitoftheselectedrangehasbeenexceeded.
Increasetherangesettinguntilthesymbolremainsoffduringmeasurements.Similarly,if
theUNDERindicatorappears,reducetherangesettinguntilthe
symbolremainsoff.Both
indicatorsarenon‐latchingandwillclearwhenthecorrectrange isselected.
5. Holdtheinstrumentcomfortablyinhand(awayfromthebody)orpositionitonatripod.
Pointthemicrophonetowardthenoisesource,thesoundpressurelevelwillbedisplayed
onthe
meter’sLCDdisplay
6. Thenumericlevelindicationonthedisplayshowsthecurrentlymeasuredsoundlevel.The
readingisupdatedoncepersecond.
7. PresstheMAXbuttontodisplaythemaximumsoundlevelencounteredduringa
measurementperiod;theMAXindicatorwillblinkappearonthedisplay.Pressthe
MAX
buttonagaintoexitthismode
8. PressDATE/TIMEtochangefromcurrenttimehour:minute:seconddisplaytocurrent
dateyear–month‐daydisplay.Thedisplaywillreverttothecurrenttimedisplayafter2
seconds.

w ww . . co m
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