User manual

EMF450-en-GB_V1.1 8/15
6
Operation
PowerON/OFF
1. Pressthepowerbuttontopowerthemeter.Thedisplaywillshowthemain
measurementscreen.Ifthemeterdoesnotpoweron,checkthatthebatteriesare
installedcorrectlyandarefresh(seebatteryinstallation/replacementsectionlaterin
thisguide).TheEM450canalsobepoweredfromaUSB
port.
2. PressandholdthePowerbuttonfor3secondstopoweroffthemeter.
ExternalUSBpowersupply
An iconisdisplayedwhenanexternalUSBpowersupplyisconnectedtothemeter’sUSB
jackonthebottomofthemeter.Voltagespecificationis4.7~5.2VDCwithcurrentgreater
thanorequalto500mA.USBcablesshouldnotreachoverthetoprimofthebuttonsduring
testingsincethe
EMF450willrecognizethiscableasan antennacausingthereadingstobe
inaccurate.
Datahold(HOLD)
PresstheHOLDbuttontofreezethecurrentreadingsonthedisplay.TheHOLDdisplay icon
willappearwhenthismodeisactive.ToreleasethedatapresstheHOLDbuttonagain.

ElectricFieldMeasurements
TheEM4 50measurestheelectri cfield(Electrical Power)intheatmosphereofthesensor’s
surroundings.Thesensororientationisprintedonthebackofthemeter.

Performall testsaccordingtotheindicat eddirectionoftheelec tricfield sensor.
Holdthemeteratthebottoman datarm’slength,as
showninFigur e3.



Figure3–OrientingthemeterforElectricalFieldMeasurements