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Measurement Tutorial
Resistance Measurement Considerations
When measuring resistance, the test current flows from the input HI terminal
through the resistor being measured. The voltage drop across the resistor being
measured is sensed internal to the multimeter. Therefore, test lead resistance is
also measured.
The errors mentioned earlier in this chapter for DC voltage measurements also
apply to resistance measurements. Additional error sources unique to resistance
measurements are discussed here.
Removing Test Lead Resistance Errors
To eliminate offset errors associated with test lead resistance, refer to
measurement"
Minimizing Power Dissipation Effects
When measuring resistors designed for temperature measurements (or other
resistive devices with large temperature coefficients), be aware that the
multimeter will dissipate some power in the device-under-test (DUT).
If power dissipation is a problem, you should select the multimeter's next higher
measurement range to reduce the errors to acceptable levels. The following table
shows several examples.
Table 3-2
Examples of measurement ranges
Range
100
1 k
10 k
100 k
1 M
10 M
100 M
104
on page 51.
Test Current
1 mA
0.5 mA
100
A
μ
10
A
μ
1 μA
100 nA
100 nA / 10 M
"Null
DUT Power at Full Scale
100 μW
250 μW
100 μW
10 μW
1 μW
100 nW
1 μW
Keysight 34450A User's Guide
Capítulos
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