Operator`s manual

11 Signametrics
2.3 Resistance Measurements
2.3.1 2-wire
Accuracy ± (% of reading + Ω) [1]
Range [4] Full Scale
7 ½ Digits
Resolution Source
current
24 hours
23°C ± 1°C
90 Days
23°C ± 5°C
One Year
23°C ± 5°C
24 Ω[3] 24.000000 Ω 1 µΩ
10 mA
0.0038 + 1.4 mΩ [2] 0.005 + 1.6 mΩ [2] 0.008 + 2 mΩ [2]
240 Ω 240.00000 Ω 10 µΩ
1 mA
0.0037 + 4.5 mΩ [2] 0.0046 + 5 mΩ [2] 0.007 + 6 mΩ [2]
2.4 kΩ 2.4000000 kΩ 100 µΩ
1 mA
0.0023 + 28 mΩ 0.004 + 32 mΩ 0.006 + 33 mΩ
24 kΩ 24.000000 kΩ 1 mΩ 100 µA 0.0025 + 300 mΩ 0.004 + 330 mΩ 0.006 + 350 mΩ
240 kΩ 240.00000 kΩ 10 mΩ 10 µA 0.0055 + 3.2 Ω 0.006 + 4 Ω 0.007 + 5 Ω
2.4 MΩ 2.4000000 MΩ 100 mΩ 1 µA 0.018 + 40 Ω 0.03 + 50 Ω 0.04 + 70 Ω
24 MΩ 24.0000 MΩ 100 Ω
100 nA
0.12 + 400 Ω 0.13 + 500 Ω 0.2 + 600 Ω
240 MΩ[3] 240.000 MΩ 1 kΩ
10 nA
0.8 + 20 kΩ 1.0 + 30 kΩ 1.3 + 50 kΩ
[1] With Aperture set to  0.5 Sec, and within one hour from Self Calibration (S-Cal).
[2] Use of S-Cal and Relative to improve measurement floor.
[3] Ranges are only available with the SM2064.
[4] Test voltages are 2.4V max with the exception of the 24
Ω and 240 Ω ranges 240 mV.
2.3.2 4-wire
Accuracy ± (% of reading + Ω) [1]
Range [4] Full Scale
7 ½ Digits
Resolution Source
current
24 hours
23°C ± 1°C
90 Days
23°C ± 5°C
One Year
23°C ± 5°C
24 Ω [3] 24.000000 Ω 1 µΩ
10 mA
0.0038 + 0.7 mΩ [2] 0.005 + 0.8 mΩ [2] 0.008 + 1 mΩ [2]
240 Ω 240.00000 Ω 10 µΩ
1 mA
0.0037 + 3 mΩ [2] 0.0046 + 4 mΩ [2] 0.007 + 5 mΩ [2]
2.4 kΩ 2.4000000 kΩ 100 µΩ
1 mA
0.0023 + 28 mΩ 0.004 + 32 mΩ 0.006 + 33 mΩ
24 kΩ 24.000000 kΩ 1 mΩ 100 µA 0.0025 + 300 mΩ 0.004 + 330 mΩ 0.006 + 350 mΩ
240 kΩ 240.00000 kΩ 10 mΩ 10 µA 0.0055 + 3.2 Ω 0.007 + 4 Ω 0.007 + 5 Ω
2.4 MΩ 2.4000000 MΩ 100 mΩ 1 µA 0.018 + 40 Ω 0.03 + 50 Ω 0.04 + 70 Ω
24 MΩ 24.0000 MΩ 100 Ω
100 nA
0.12 + 400 Ω 0.13 + 500 Ω 0.2 + 600 Ω
[1] With Aperture set to  0.5 Sec, and within one hour from Self Calibration (S-Cal).
[2] Use of Relative to facilitate indicated floor (adder part of spec).
[3] 24 Ω range only available with SM2064.
[4] Test voltages are 2.4V max with the exception of the 24
Ω and 240 Ω ranges 240 mV.
2.3.3 6-wire Guarded Resistance Measurement (SM2064)
This is an in-circuit forced guard measurement method, as implemented in ICT testers. Add this typical additional
error to the above specification.
Accuracy ± (% of reading + Ω)
Range Guard forced current
One Year 23°C ± 5°C [1]
24 Ω [3]
10 mA
0.3 + 4 mΩ
240 Ω
1 mA
0.003 + 20 mΩ
2.4 kΩ
1 mA
0.005 + 100 mΩ
24 kΩ 100 µA 0.03 + 1 Ω
240 kΩ 10 µA 0.35 + 10 Ω
24 MΩ 1 µA 0.85 + 1000 Ω
[1] This table should be used in conjunction with the 2-wire and 4-wire table above.