User manual

AN320-EU-EN V1.0 1/13

P4.0:AltitudePressureCompensation

5. WheninsetupmodeP4.0,pressHOLDtoenterthepressurecompensationparameter.The

LCDwillshowhPA(unitofmeasure:hector‐Pascalormillibar)onthelowerlineanda

flashing4‐digitnumber(from700to1990;thedefaultis1013hPAwhichis

standard

pressure)ontheupperline.

6. PressU/modetoincreasethepressurevalueandL/modetodecreaseit.

7. PressHOLDoncemoretoreturntoP4.0.

8. PressandholdthePOWERSETbuttonfor2secondstoreturntothenormaloperating

mode.

Calibration

CAUTION:DonotcalibratethemeterinairwithanunknownCO

concentration.Doingsowill

resultinthemeterbeingcalibratedtothestandard400ppmandcouldleadtoinaccurate

results.

1. Placethemeterinacalibratedenvironment.

2. WiththemeterOFF,pressSET,HOLDandL/modesimultaneouslytoenterCO

calibration

mode.

3. Themeterwillruna30secondcountdownand'CAL'willshowinthelowerdisplay.

4. DuringcalibrationaCO

readingbetween380‐420ppmwillflashintheupperdisplay.

5. Waitforapprox.10minutesforthereadingtostopflashing.

6. Thecalibrationisnowcompleteandthemeterwillreturntothenormaloperatingmode.

7. Toabortthecalibrationatanytime,turnOFFthemeter.

8. IfthecalibrationfailsforanyreasonpleasereturnthemetertoExtechInstrumentsforan

evaluationandpossiblerepair.