Fluke 124 FE 123 & 124 Users Manual - Page 67

Using Proper Grounding, Grounding with Short Ground Lead

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Using Proper Grounding Incorrect grounding can cause various problems. This Section gives you guidelines for proper grounding. 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 potential. 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. 3 Tips and Troubleshooting Using Proper Grounding Figure 3-2. Grounding with Short Ground Lead Figure 3-3. Grounding with Unshielded Ground Lead 59

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Tips and Troubleshooting
Using Proper Grounding
3
59
Using Proper Grounding
Incorrect grounding can cause various problems. This
Section gives you guidelines for proper grounding.
±
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
potential.
±
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 3-2. Grounding with Short Ground Lead
Figure 3-3. Grounding with Unshielded Ground Lead