The test sets covered by the specification are intended for use in sheltered military environments, onboard ships and at land based installations. The individual test sets limitations is established by its type classification (see 1.2) as follows:

(a) Type A - For use in locating short circuits, open circuits, and ground in light duty, small armatures of rotating electrical machinery.

(b) Type B - For use in locating short circuits, open circuits, and ground in heavy duty, small armatures, including engine starting motor armatures and battery charging generator armatures of rotating electrical machinery.

(c) Type C - For use in locating short circuits, and open circuits in medium size armatures and stators of rotating electrical machinery.

(d) Type D - For use in locating short circuits and open circuits in large size armatures and starors of rotating electrical machinery.