ALTANA Light-Duty Impact Tester - Manual (Page 7)

6
/PERATION
4HE¬PANEL¬TO¬BE¬TESTED¬IS¬PLACED¬OVER¬THE¬HOLE¬IN¬
THE¬BASE¬PLATE¬4HE¬IMPACTER¬IS¬RAISED¬BY¬MEANS¬
OF¬A¬LIFT¬SCREW¬WHICH¬EXTENDS¬FROM¬THE¬IMPACTER¬
THROUGH¬THE¬SLOT¬IN¬THE¬TUBE ¬TO¬A¬POINT¬WHERE¬IT¬
COINCIDES¬WITH¬THE¬DESIRED¬MARK¬ON¬THE¬TUBE¬AND¬
THEN¬DROPPED¬4HE¬TEST¬PANEL¬IS¬THEN¬EXAMINED¬
UNDER¬LOW¬POWER¬MAGNIlCATION¬FOR¬mAKING¬
CRACKING¬AND¬DEFORMATION¬
3PECIMENS¬OF¬ANY¬REQUIRED¬THICKNESS¬FROM¬THIN¬
SHEET¬METAL¬TO¬PIECES¬OF¬MATERIAL¬TWO¬INCHES¬THICK¬
MAY¬BE¬USED¬#OMPENSATION¬FOR¬PANEL¬THICKNESS¬IS¬
ACCOMPLISHED¬BY¬MOVING¬THE¬TUBE¬UPWARD¬SO¬THAT¬
THE¬LIFT¬SCREW¬IS¬AT¬THE¬ZERO¬MARK¬ON¬THE¬TUBE¬WHEN¬
THE¬PUNCH¬AND¬WEIGHT¬ARE¬AT¬REST¬ON¬THE¬SPECIMEN¬
)N¬MOST¬CASES¬THIS¬ADJUSTMENT¬IS¬NOT¬NECESSARY¬
BECAUSE¬THE¬RESULTS¬ARE¬NOT¬VISIBLY¬AFFECTED¬BY¬
SUCH¬SMALL¬DIFFERENCES¬IN¬DROP¬HEIGHT
/PERATION