Vanguard Auto-Ohm 100_200 s2 User Manual
Page 16
AUTO-OHM 100/200 Series 2 Operating Procedures
16
Rev 3, 2009
4.0 OPERATING VOLTAGES
The Auto-Ohm operates on voltages between 100-240Vac, 50/60Hz.
5.0 CABLE CONNECTION
The Auto-Ohm is supplied with 30-foot test cables with heavy-duty alligator clamps. Both the
current (#1 AWG) and sense leads are combined into one cable (Figure 1.0). A typical cable
connection for the Auto-Ohm to a device under test (using the combined test leads) is shown in
Figure 9.0 and Figure 11.0. Figure 8.0 and Figure 10.0 which illustrate the connection using
separate current and sense leads.
To protect the Auto-Ohm against static discharge in the substation, always connect the unit’s
ground stud to the substation ground. It is also highly recommended to ground one side of the
circuit breaker bushing during test to eliminate any static discharge to the Auto-Ohm.
NOTE
The sense input is not polarity sensitive. The sense cables may be
connected to either input without affecting circuit operation.
Figure 8.0 AUTO-OHM 100/200 Connection Diagram 1 (Separate Leads)
Figure 9.0 AUTO-OHM 100/200 Connection Diagram 2 (Combined Leads)