Datasheet

8845A and 8846A Fluke Corporation 5
Resistance
Specifications are for 4-wire resistance function, 2 x 4-wire resistance, or 2-wire resistance with zero. If zero is not used, add 0.2 Ω for 2-
wire resistance plus lead resistance, and add 20 mΩ for 2 x 4-wire resistance function.
Measurement Method..................................................Current source referenced to LO input.
Max. Lead Resistance (4-wire ohms)......................10 % of range per lead for 100 Ω, 1 kΩ ranges. 1 kΩ per lead on all other ranges.
Input Protection............................................................1000 V on all ranges.
Input Characteristics
Resolution
Range
Full Scale
(6½ Digits)
4½ Digits 5½ Digits 6½ Digits
Source Current
10 Ω
[1]
10.00000 Ω 1 mΩ 100 μΩ 10 μΩ 5 mA
100 Ω 100.0000 Ω 10 mΩ 1 mΩ 100 μΩ 1 mA
1 kΩ 1.000000 kΩ 100 mΩ 10 mΩ 1 mΩ 1 mA
10 kΩ 10.00000 kΩ 1 Ω 100 mΩ 10 mΩ 100 μA
100 kΩ 100.0000 kΩ 10 Ω 1 Ω 100 mΩ 10 μA
1 MΩ 1.000000 MΩ 100 Ω 10 Ω 1 Ω 10 μA
10 MΩ 10.00000 MΩ 1 kΩ 100 Ω 10 Ω 1 μA
100 MΩ 100.0000 MΩ 10 kΩ 1 kΩ 100 Ω 1 μA || 10 MΩ
1.0 GΩ
[1]
1.000000 GΩ 100 kΩ 10 kΩ 1 kΩ 1 μA || 10 MΩ
[1] 8846A Only
8846A Accuracy
Accuracy is given as ± (% measurement + % of range)
Range
24 Hour
(23 ± 1 °C)
90 Days
(23 ± 5 °C)
1 Year
(23 ± 5 °C)
Temperature
Coefficient/ °C
Outside 18 to 28 °C
10 Ω 0.003 + 0.01 0.008 + 0.03 0.01+ 0.03 0.0006 + 0.0005
100 Ω 0.003 + 0.003 0.008 + 0.004 0.01 + 0.004 0.0006 + 0.0005
1 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
10 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
100 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
1 MΩ 0.002 + 0.001 0.008 + 0.001 0.01 + 0.001 0.001 + 0.0002
10 MΩ 0.015 + 0.001 0.02 + 0.001 0.04 + 0.001 0.003 + 0.0004
100 MΩ 0.3 + 0.01 0.8 + 0.01 0.8 + 0.01 0.15 + 0.0002
1 GΩ 1.0 + 0.01 1.5 + 0.01 2.0 + 0.01 0.6 + 0.0002
8845A Accuracy
Accuracy is given as ± (% measurement + % of range)
Range
24 Hour
(23 ± 1 °C)
90 Days
(23 ± 5 °C)
1 Year
(23 ± 5 °C)
Temperature
Coefficient/ °C
Outside 18 to 28 °C
100 Ω 0.003 + 0.003 0.008 + 0.004 0.01 + 0.004 0.0006 + 0.0005
1 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
10 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
100 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
1 MΩ 0.002 + 0.001 0.008 + 0.001 0.01 + 0.001 0.0010 + 0.0002
10 MΩ 0.015 + 0.001 0.02 + 0.001 0.04 + 0.001 0.0030 + 0.0004
100 MΩ 0.3 + 0.01 0.8 + 0.01 0.8 + 0.01 0.1500 + 0.0002
Additional Ohms Errors
Digits NPLC Additional Noise Error
6½ 100 0 % of range
6½ 10 0 % of range
5½ 1 0.001 % of range
5½ 0.2 0.001 % of range ± 20 mΩ
4½ 0.02 0.01 % of range ± 20 mΩ