3
Making Measurements
Using the Measurement Functions
TRUΩ - Movement between Menus
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TRUΩ Movement Between Menu
Measuring Resistance
2-Wire Measurements
For many applications the simple 2-wire arrangement will be adequate. See Figure 3-5.
However, the value displayed will include the resistance of the connecting leads.
Use a shielded twisted-pair cable, preferably of PTFE insulation, to reduce induced
voltages, induced charge and shunt leakage resistance, particularly where Rx is high.
2-wire resistance measurement is not available when in
TruΩ mode and is not well suited
to use in the 2 Ω range. In the latter case zero compensation for lead and internal
resistance contributions may limit full-scale readout. 2-wire measurements above 1.5 Ω
should be made using higher ranges.
INPUT HI
INPUT HI
INPUT LO
INPUT LO
GUARD
Rx
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Figure 3-5. 2-Wire Measurements
4-wire Measurements
With a 4-wire connection the lead resistances have negligible effect and only the value of
Rx is displayed.
3-17
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