User manual

EXTECHINSTRUMENTS
4FM100‐en‐GB_v1.76/16
ZEROCalibration
Ensurethatcalibrationisperformedinacleanairenvironment(noVOCsorHCHOgases).
Pressandholdthecontrolbuttonfor3seconds(until
appearsontheLCDscreen).
Pressandholdthebuttonagaintostartcalibration.
Releasethecontrolbuttonandwait300secondsforthecalibrationtocomplete.Themeter
willdisplay‘END’for2secondswhencalibrationiscompleteandwillthenreturntothe
normalmodeofoperation.

ChangingTemperatureUnits
o
C/
o
F
When
isshownonthedisplay,pressandholdthecontrolbuttontodisplaythecurrent
temperatureunit.MomentarilypresstheCalibrationcontrolbutton totoggle°Cand°F
units.Tosavesetting,pressandholdthecontrolbutton.Themeterwillreturntothe
normalmode.


TemperatureCompensationAdjustment
When
isshownonthedisplay,pressandholdthecontrolbutton.Thefactorydefault
‘0.0’valuewillflash.Turnthecompensationpotentiometerclockwisetoincreasethe
temperatureoffsetorcounterclockwisetodecreaseoffset).Therangeis‐5.4°Fto+5.4°F(‐
3.0°Cto+3.0°C).Whendone,pressandholdthecontrol
buttontosavethesetting.The
meterwillreturntothenormalmeasurementmodeandwillreflecttheoffsetwhen
temperaturereadingsaredisplayed.
