e. External Test Procedures. External testing procedures involve testing ground
continuity with a volt/ohm meter. You perform external tests on hardwired equipment.
The following paragraphs describe the procedures to follow for external tests.
(1) External meter, ohms. Refer to figure 2-4. Set the mode switch to EXT
METER, OHMS. In this mode, the current source and measurement circuits are both
connected to the rear panel jacks. Connect the red probe to the red EXT jack and the
black probe to the black EXT jack. Connect the resistance to be measured between the
probes. Be sure the current source active lamp comes on when the connections are all
made. This is a two terminal measurement. You can also perform this test with the Kelvin
cables as shown in figure 2-5.
Figure 2-4. External meter connections except mOhms.
Figure 2-5. External meter connections for mOhms.