The AC-07-5000 pulsed DCPD unit is integrated with BISS 2370 Series controllers for full automated crack size measurement using the potential drop technique. Documentation provided with unit may be used to interface it with third party controllers as well. The principle of operation of the AC-07-5000 DCPD unit is schematically described in the figure below. The circuit provides for parallel and simultaneous measurement of two potential drops, one across the crack and another on the specimen, to obtain non-dimensional estimates of potential drop per ampere of current passing through the circuit. Both values are estimated with high resolution in order of ±0.01mm or better. A TTL logic input to the unit is used to switch the current On and Off. Application software provided with the host controller allows for selection of pulse duration and other settings. This unit can be used either with or without electrical isolation of alternate current paths.
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