Extech Instruments NON-DISPLAY PORTABLE Specifications download pdf (Page 8)

CG204-EU-EN v2.2 8/13

Calibration

CalibrationTypes

Themeterisfactorycalibratedbeforeshipmenttothecustomer;howeverthecustomershouldperforma

zerocalibrationandamulti‐pointcalibrationbeforeanycriticalmeasurementsaretaken.Thecalibration

optionsarelistedbelow.Readthedescriptionforeachandselectthebestmatchforagivenapplication.

1. Zero

PointCalibration:Performbeforeeachmeasurementsession.

2. OnePointCalibration:Useforhighaccuracywithrepeatedtestsonaconstantcoatingthickness.

3. Multi‐PointCalibration:Useforhighaccuracywithinaknownrangeofcoatingthickness.

4. Calibrationforshot‐blastedsurfaces.

CalibrationConsiderations

Thecalibrationsamplemustcorrespondtotheproductsampleinthefollowingways:

 Curvatureradius

 Substratematerialproperties

 Substratethickness

 Sizeofmeasurementarea

 Thepointatwhichthecalibrationismadeonthecalibrationsamplemustalwaysbeidenticalwith

thepointofmeasurementon

theproductitself,especiallyinthecaseofcornersandedgesof

smallparts.

Toachievethehighestmeasurementaccuracy,performseveralcalibrationsinsuccession(forzerovalues

andcalibrationfilmvalues).

Preparingforcalibration

1. Cleantheprobetip(grease,oil,metalscrap,andtheslightestimpuritywillaffectmeasurementand

distortreadings).

2. SwitchthemeterON(ata10cm[4”]minimumdistancefromanymetal).

3. Readythesuppliedmetalsubstratesamplesandnecessaryfilms(suppliedcalibrationreference

films).

4. Setthemeter

to:

a. DIR:(MENU‐OPTIONS‐WorkingMode‐Direct)

b. CONTINUOUS:(MENU‐OPTIONS‐MeasureMode‐Continuousmode[flashingunitsindicator])

c. MAX:(MENU‐OPTIONS‐LCDStatistic‐Maximum).

5. Themeterisnowreadyforcalibration.

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Extech Instruments NON-DISPLAY PORTABLE Specifications Page 8