The DCM-2 is a modern microprocessor based instrument for measuring crack depth in metalsundergoing materials testing. Building on the success of the DCM-1 this unit takes on boardcustomer comments and suggestions, as shown in its impressive features list.It utilises the pulsed current potential drop method (DCPD) which is an established technique alsocovered by the ASTM 647 standard. The technique involves passing a constant current through themetal under test and measuring the resultant voltage drop that is created across the specimen. Thepresence of a growing defect will alter this voltage and by suitable calibration, a measure of thedefect depth can be obtained. DCPD is generally regarded as easier to set-up than ACPD, but careis required to attain comparable crack depth resolutions d...Read more
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