Making Measurements 2
Measuring Resistance
U1271A/U1272A User’s Guide 71
Measuring Resistance
Resistance (opposition to the current flow) is measured by
sending a small current out through the test leads to the
circuit under test. Because this current flows through all
possible paths between the leads, the resistance reading
represents the total resistance of all paths between the
leads. Resistance is measured in ohms (Ω).
1 To measure resistance, set the multimeter’s rotary switch
to / and set up your multimeter as shown in
Figure 2- 14.
2 Probe the test points and read the display.
Figure 2-13 Resistance display
Keep the following in mind when measuring resistance.
• The test leads can add 0.1 Ω to 0.2 Ω of error to
resistance measurements. To test the leads, touch the
probe tips together and read the resistance of the leads.
To remove lead resistance from the measurement, hold the
test lead tips together and press . Now the
resistance at the probe tips will be subtracted from all
future display readings.
To avoid possible damage to your multimeter or to the equipment under
test, disconnect the circuit power and discharge all high-voltage
capacitors before measuring resistance.
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