Introduction and Specifications 
  Electrical Specifications  1 
  1-15 
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 10 Ω, 100 Ω, 1 kΩ ranges. 1 kΩ per lead on 
all other ranges 
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 analog filter off and power line 
frequency ±0.1 % 
100 dB for NPLC of 1 or greater with analog filter on and power line 
frequency ±0.1 % 
Analog Filter............................................................ When using the analog filter, specifications are relative to within one 
hour of using the ZERO function for that range and NPLC setting. 
Input Characteristics 
Resolution 
Range Resolution 
4½ Digits  5½ Digits  6½ Digits 
Source Current 
10 Ω 
[1]
 10.00000 Ω 1 mΩ 100 μΩ 10 μΩ 
5 mA/13 V 
100 Ω 100.0000 Ω 10 mΩ 1 mΩ 100 μΩ 
1 mA/6 V 
1 kΩ 1.000000 kΩ 100 mΩ 10 mΩ 1 mΩ 
1 mA/6 V 
10 kΩ 10.00000 kΩ 1 Ω 100 mΩ 10 mΩ 100 μA/6 V 
100 kΩ 100.0000 kΩ 10 Ω 1 Ω 100 mΩ 100 μA/13 V 
1 MΩ 1.000000 MΩ 100 Ω 10 Ω 1 Ω 10 μA/13 V 
10 MΩ 10.00000 MΩ 1 kΩ 100 Ω 10 Ω 1 μA/13 V 
100 MΩ 100.0000 MΩ 10 kΩ 1 kΩ 100 Ω 1 μA || 10 MΩ/10 V 
1.0 GΩ 
[1]
 
1.000000 GΩ 100 kΩ 10 kΩ 1 kΩ 1 μA || 10 MΩ/10 V 
[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