Revision B 3-17
Maintenance: Domestic Electrical Safety Tests
MAC 5000 resting ECG analysis system
2000657-002
Ground Continuity
This test verifies that there is continuity (less than 100 mΩ resistance)
between all the exposed metal surfaces, which have the potential to
become energized, and the ground prong on the mains AC power cord.
If the metal surfaces are anodized or painted, scrape off a small area in
an inconspicuous area for the probe to make contact with the metal.
■ Use a digital multimeter to check ground continuity from the AC
line cord ground pin to exposed metal surfaces. (i.e. rear panel
ground lug, ANA/TTL, and EXT. VID. )
■ If the measurements are significantly out of range, check for
breaks in the power cord or in the internal connections within
the unit.
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