Knopp Test Small 320×123 Medium 640×246 Large 1024×394 Download Tiff Original 2737×1053 | (435.4 KB) Description Knopp test set for determining current in direct-current conductors. Keywords direct-current conductors, direct-current conductors example, Knopp, Knopp example, Knopp test set, Knopp test set example Galleries Electrical System, Public Utilities Source: