Extech Instruments 407780A - Power, Mounting, and Alarms; Alarm Output Configuration

407780A‐EU‐ENv1.34/14
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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.
2.
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.
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SoftwareInstallationandOperation
Forinstallationandoperatinginstructions,pleaserefertothecontentsofthesuppliedCD‐
ROM.
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