Fluke fluke123 user manual Using Proper Grounding, Potential

Tips and Troubleshooting	3
Using Proper Grounding

Using Proper Grounding

Incorrect grounding can cause various problems. This

Section gives you guidelines for proper grounding.

λ Use the short ground lead(s) when measuring DC or AC signals on input A and input B. (See Figure 3-2.)

Warning

To avoid electrical shock or fire, use only one
COM (common) connection, or ensure that all
connections to COM are at the same	Figure 3-2. Grounding with Short Ground Lead
potential.

λ Use the unshielded black ground lead to COM (common) for Ohm (Ω), Continuity, Diode, and Capacitance measurements. (See Figure 3-3.)

Using the unshielded ground lead is also possible for single or dual input measurements for waveforms with a frequency up to 1 MHz. This may add some hum or noise to the waveform display due to the unshielded ground lead.

Figure 3-3. Grounding with Unshielded Ground Lead

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