Signametrics SMX2040, Operator'S Manual

Page: 13 / 127

Signametrics 12
2.5 Resistance Measurements
2.5.1 2-wire and 4-wire
Accuracy ± (% of r
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 m
Ω
0.005 + 1.5 m
Ω
0.008 + 2 m
Ω
330
Ω
330.0000
Ω
100
µΩ
1 mA
0.0037 + 4.5 m
Ω
0.0046 + 5 m
Ω
0.007 + 6 m
Ω
3.3 k
Ω
3.300000 k
Ω
1 m
Ω
1 mA
0.0023 + 28 m
Ω
0.003 + 32 m
Ω
0.005 + 33 m
Ω
33 k
Ω
33.00000 k
Ω
10 m
Ω
100
µ
A 0.0025 + 300 m
Ω
0.0033 + 330 m
Ω
0.006 + 350 m
Ω
330 k
Ω
330.0000 k
Ω
100 m
Ω
10
µ
A 0.0055 + 3.2
Ω
0.007 + 4
Ω
0.009 + 5
Ω
3.3 M
Ω
3.300000 M
Ω
1
Ω
1
µ
A 0.018 + 40
Ω
0.03 + 50
Ω
0.04 + 70
Ω
33 M
Ω
33.0000 M
Ω
100
Ω
100 nA
0.12 + 400
Ω
0.13 + 500
Ω
0.2 + 600
Ω
330 M
Ω
[3] 330.00 M
Ω
10 k
Ω
10 nA
1 + 50 k
Ω
1.4 + 60 k
Ω
2.0 + 80 k
Ω
[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 k
Ω
range.
[3] 33
Ω
and 330 M
Ω
ranges are only available with the SMX2042,44.
2.5.2 6-wire Guarded Resistance Measurement (SMX2044)
Typical additional error contributed by guarding
Accuracy ± (% of r
Ω
)
Range Source current
One Year 23
°
C
±
5
°
C [1]
33
Ω
10 mA
0.3 + 4 m
Ω
330
Ω
1 mA
0.003 + 20 m
Ω
3.3 k
Ω
1 mA
0.005 + 100 m
Ω
33 k
Ω
100
µ
A 0.03 + 1
Ω
330 k
Ω
10
µ
A 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 (SMX2044)
Accuracy ± (% of r
Ω
) [1]
Leakage Reading Voltage range
One Year 23
°
C
±
5
°
C [1]
1.00
η
A to 100.00
η
A
-10 V to +10 V 2 + 350 pA
100.00
η
A to 1000.00
η
A
-9 V to + 9 V
1.2 + 2
η
A
1000.00
η
A to 3.3
µ
A
-7 V to + 7 V
1.5 + 20
η
A
[1] Error does not include external shunt resistor’s tolerance.
2.7 RTD Temperature Measurement (SMX2044)
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 k
Ω
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 2 rps or slower, using a 4-wire RTD. Measurement accuracy does not
include RTD probe error.
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