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407780A‐EU‐ENv1.34/14

Externalpowersource

InserttheplugofanACadaptororexternalbatterypackintotheDC6V(DCsourcefrom5Vto

6V)socketonthesideoftheinstrument.Whenaconnectorisinsertedintothissocket,the

internalbatterieswillbedisconnectedandtheinstrumentwillbepoweredfromtheexternal



source.Thelowbatterysymbol



willappearonthedisplayiftheexternalvoltageis

insufficientfortheinstrumenttoprovideaccuratemeasurements.



Note:Ensurethattheexternalpowersourceisconnectedwiththepolarityasindicatedinthe

followingdiagram;otherwisedamagemaybe causedtotheinstrumentandexternalpower

source.



Windscreen

Whenmakingmeasurementsinstrongwinds,windnoiseandstrongairmovementsatthe

microphonecancausemeasurementerrors.Sucheffectcanbereducedbyusingthe

windscreen.

TripodMounting

Forlong‐termmeasurements,theinstrumentmaybemountedonastandardcameratripod

usingtherearintegral¼”x20UNCmountingthread.

Alarmoutput

IfthemeasureddBlevelexceedsthesetlimit,theoverlimitsignalwillappearatthealarm

outputconnector(5Vdcoutput).Theoutputsignalwillremainactiveaslongasthesoundlevel

exceedsthesetlimit

Settingthesoundlevelalarmhighlimit:

1. SwitchthemeterOFF.

PressandholdtheLEQSELSPLbuttonwhileswitchingthemeterON.

3. ReleasetheLEQSELSPLbutton;theALARMsymbol(alongwiththecurrentlysetlimit)is

displayed.

4. Usethe▲▼buttonstosetthedesiredsoundlevelhighlimitvalue.

5. PressLEQSEL

SPLbuttontostorethesettingandtoexitthismode.



SoftwareInstallationandOperation

Forinstallationandoperatinginstructions,pleaserefertothecontentsofthesuppliedCD‐

ROM.



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information@itm.com1.800.561.8187

Extech Instruments 407780A User Manual

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