Resistance; Input Characteristics; 8846A Accuracy - Fluke 8845A Calibration Manual

8845A/8846A
Calibration Manual

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
Input Protection .................................................... 1000 V on all ranges
Common Mode Rejection..................................... 140 dB at 50 or 60 Hz ± 0.1 % (1 kΩ unbalance)
Normal Mode Rejection ........................................ 60 dB for NPLC of 1 or greater with dc filter off and power line

Input Characteristics

Range Resolution
[1]
10 Ω 10.00000 Ω
100 Ω 100.0000 Ω
1 kΩ 1.000000 kΩ
10 kΩ 10.00000 kΩ
100 kΩ 100.0000 kΩ
1 MΩ 1.000000 MΩ
10 MΩ 10.00000 MΩ
100 MΩ 100.0000 MΩ
[1]
1.0 GΩ 1.000000 GΩ
[1] 8846A Only

8846A Accuracy

Accuracy is given as ± (% measurement + % of range)
Range
10 Ω
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
1 GΩ
8845A Accuracy
Accuracy is given as ± (% measurement + % of range)
Range
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
1-14
4½ Digits
1 mΩ
10 mΩ
100 mΩ
1 Ω
10 Ω
100 Ω
1 kΩ
10 kΩ
100 kΩ
24 Hour 90 Days
(23 ±1 °C) (23 ±5 °C)
0.003 + 0.01 0.008 + 0.03
0.003 + 0.003 0.008 + 0.004
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.001 0.008 + 0.001
0.015 + 0.001 0.02 + 0.001
0.3 + 0.01 0.8 + 0.01
1.0 + 0.01 1.5 + 0.01
24 Hour 90 Days
(23 ±1 °C) (23 ±5 °C)
0.003 + 0.003 0.008 + 0.004
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.0005 0.008 + 0.001
0.002 + 0.001 0.008 + 0.001
0.015 + 0.001 0.02 + 0.001
0.3 + 0.01 0.8 + 0.01
other ranges
frequency ±0.1 %
100 dB for NPLC of 1 or greater with dc filter on and power line
frequency ±0.1 %
Resolution
5½ Digits
100 μΩ 10 μΩ
100 μΩ
1 mΩ
10 mΩ 1 mΩ
100 mΩ 10 mΩ
1 Ω
100 mΩ
10 Ω 1 Ω
100 Ω 10 Ω
100 Ω
1 kΩ
10 kΩ 1 kΩ
1 Year
(23 ±5 °C)
Outside 18 to 28 °C
0.01+ 0.03
0.01 + 0.004
0.01 + 0.001
0.01 + 0.001
0.01 + 0.001
0.01 + 0.001
0.04 + 0.001
0.8 + 0.01
2.0 + 0.01
1 Year
(23 ±5 °C)
Outside 18 to 28 °C
0.01 + 0.004
0.01 + 0.001
0.01 + 0.001
0.01 + 0.001
0.01 + 0.001
0.04 + 0.001
0.8 + 0.01
Source Current
6½ Digits
5 mA/13 V
1 mA/6 V
1 mA/6 V
100 μA/6 V
100 μA/13 V
10 μA/13 V
1 μA/13 V
1 μA || 10 MΩ/10 V
1 μA || 10 MΩ/10 V
Temperature
Coefficient/ °C
0.0006 + 0.0005
0.0006 + 0.0005
0.0006 + 0.0001
0.0006 + 0.0001
0.0006 + 0.0001
0.001 + 0.0002
0.003 + 0.0004
0.15 + 0.0002
0.6 + 0.0002
Temperature
Coefficient/ °C
0.0006 + 0.0005
0.0006 + 0.0001
0.0006 + 0.0001
0.0006 + 0.0001
0.0010 + 0.0002
0.0030 + 0.0004
0.1500 + 0.0002