Operator`s manual

Signametrics 12
2.5 Resistance Measurements
2.5.1 2-wire and 4-wire
Accuracy ± (% of reading + Ω) [1]
Range [2] Full Scale
6 ½ Digits
Resolution Source
current
24 hours
23°C ± 1°C
90 Days
23°C ± 10°C
One Year
23°C ± 10°C
33 Ω [3] 33.00000 Ω 10 µΩ
10 mA
0.0038 + 1 mΩ 0.005 + 1.5 mΩ 0.008 + 2 mΩ
330 Ω 330.0000 Ω 100 µΩ
1 mA
0.0037 + 4.5 mΩ 0.0046 + 5 mΩ 0.007 + 6 mΩ
3.3 kΩ 3.300000 kΩ 1 mΩ
1 mA
0.0023 + 28 mΩ 0.003 + 32 mΩ 0.005 + 33 mΩ
33 kΩ 33.00000 kΩ 10 mΩ 100 µA 0.0025 + 300 mΩ 0.0033 + 330 mΩ 0.006 + 350 mΩ
330 kΩ 330.0000 kΩ 100 mΩ 10 µA 0.0055 + 3.2 Ω 0.007 + 4 Ω 0.009 + 5 Ω
3.3 MΩ 3.300000 MΩ 1 Ω 1 µA 0.036 + 70 Ω 0.04 + 75 Ω 0.05 + 80 Ω
33 MΩ 33.0000 MΩ 100 Ω
100 nA
0.22 + 600 Ω 0.24 + 900 Ω 0.26 + 1 kΩ
330 MΩ [3] 330.00 MΩ 10 kΩ
10 nA
1.6 + 50 kΩ 1.8 + 60 kΩ 2.0 + 80 kΩ
[1] With reading rate set to 2 rps or slower, and within one hour of Ohms zero, using Relative control. [2]
4-wire ohms is available up to the 330 kΩ range.
[3] 33 Ω and 330 MΩ ranges are only available with the SM2042 and SM2044.
2.5.2 6-wire Guarded Resistance Measurement (SM2044)
Typical additional error contributed by guarding
Accuracy ± (% of reading + Ω)
Range Source current
One Year 23°C ± 5°C [1]
33 Ω
10 mA
0.3 + 4 mΩ
330 Ω
1 mA
0.003 + 20 mΩ
3.3 kΩ
1 mA
0.005 + 100 mΩ
33 kΩ 100 µA 0.03 + 1 Ω
330 kΩ 10 µA 0.35 + 10 Ω
[1] This table should be used in conjunction with the 2-wire and 4-wire table above.
2.6 Leakage Measurement (SM2044)
Accuracy ± (% of reading + Ω) [1]
Leakage Reading Source Voltage range
One Year 23°C ± 5°C [1]
1.00 ηA to 100.00 ηA
-10 V to +10 V 2 + 350 pA
100.00 ηA to 1000.00ηA
-9 V to + 9 V
1.2 + 2 ηA
1000.00 ηA to 3.3 µA
-7 V to + 7 V
1.5 + 20 ηA
[1] Error does not include external shunt resistor’s tolerance.
2.7 RTD Temperature Measurement (SM2042, SM2044)
RTD Type
Ro (Ω)
Resolution Temperature
range
Temperature Accuracy 23°C ± 5°C [1]
One Year
pt385, pt3911,
pt3916, pt3926
100, 200 Ω 0.01°C -150 to 650°C ±0.06°C
pt385, pt3911,
pt3916, pt3926
500, 1 kΩ 0.01°C -150 to 650°C ±0.03°C
Cu (Copper)
Less than 12 Ω 0.01°C -100 to 200°C ±0.18°C for temperatures ≤ 20°C, ±0.05°C
otherwise
Cu (Copper)
Higher than 90 Ω 0.01°C -100 to 200°C ±0.10°C for temperatures ≤ 20°C, ±0.05°C
otherwise
[1] With reading rate set to 10 rps or slower, using a 4-wire RTD. Measurement accuracy does not
include RTD probe error.