Extech Instruments AN340 Manual

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AN340-EU-EN V1.3 4/13

Operation

PowerON‐OFF

1. SwitchthemeterONbypressingthepower buttonmomentarily.

2. PressagaintoswitchthemeterOFF.

3. IfthemeterdoesnotswitchON,checkthatthemeterhassix(6)freshAAAbatteries

installedintherearbatterycompartment.Refertothebatteryinstallationsectionfor

details.

4. Themetercanalsobepoweredusingthe

9VACpoweradaptor.Thepoweradaptorconnects

tothetopofthemeterusingthejackasshownintheDescriptionsectionofthisguide.

Sleepmode

Themeterwillautomaticallyenterthesleepmode(switchoff)aftertwenty(20)minutesof

inactivity.Todisablethisfeature:withthemeterOFF,pressandholdtheSETandHOLDbuttons

fortwo(2)seconds.TheLCDwilldisplay'n'asitswitchesON.Nowthe sleepmodeisdisabled

andtheusermustpressthepowerbuttonmomentarilytoswitchthemeterOFF.

Measurements

5. ConnectthesensortothejackatthetopofthemeterasshownintheDescriptionsection.

Thensensorandjackarekeyedtoensureproperconnection.Thesensordiameteris18mm

(0.7”)andthetelescopingwandextends1m(39”).

6. WiththemeterswitchedON,usetheMODE

buttontoadvancefromonemeasurementtype

tothenext(airvelocity,airfloworvolume,airtemperature,relativehumidity,wetbulb

temperature,anddewpointtemperature).Notethatforairvolumemeasurementstheuser

mustfirstentertheareavaluefortheductundertestbeforeaccuratereadingscan

bemade.

RefertotheAREAsectionofthisguideforprogrammingdetailsandtotheAppendixfor

additionalinformationonareameasurements,calculations,andunitconversions.

7. Whenmeasuring,airmustenterthevaneonthesideofthesensorwiththeprintedwords

AIRIN.Thesensorwandcan

beextendedusingitstelescopingcapabilityupto1m(39”).

8. Themeasurementisindicatedontheupperdisplaydigitsalongwiththecurrentlyselected

unitofmeasure.Tochangetheunitofmeasure,refertotheSETUPmodesection.Thelower

displaylineshowstherealtimeclock,alternating

timeanddateinformation.

9. Theairtemperatureandrelativehumiditysensorsarelocatedintheslottedopeningonthe

sensorwandbelowtheimpeller.

10. Airvelocityreadingsareindicatedinmeterspersecond(m/s)orfeetperminute(fpm).

Temperaturereadings(air,dewpoint,orwetbulb)areindicatedin°C/°F.RelativeHumidity

isindicatedin%.Airflow(volume)isindicatedinCFM(cubicfeetperminute)orCMM(cubic

metersperminute).

11. Tomeasurerelativehumidityusinganoffsetreferencevalue,pleaseaccesstheSetupmode

andinputtheoffsetvalueasdescribedintheSetupmodesection.TheLCDwilldisplaythe

measuredvalueminustheoffsetvalueoncetheoffsetisprogrammedintheSetupmode.