Resistance - Fluke 8845A User Manual

8845A/8846A
Users 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 for 2-wire resistance plus lead resistance, and add 20 m
Measurement Method ............................................. Current source referenced to LO input
Max. Lead Resistance (4-wire ohms) ..................... 10 % of range per lead for 10
Input Protection....................................................... 1000 V on all ranges
Common Mode Rejection ............................................140 dB at 50 or 60 Hz 0.1 % (1 k
Normal Mode Rejection .......................................... 60 dB for NPLC of 1 or greater with analog filter off and power line
Analog Filter............................................................ When using the analog filter, specifications are relative to within one
Input Characteristics
Range Resolution
[1]
10 10.00000
100 100.0000
1 k 1.000000 k
10 k 10.00000 k
100 k 100.0000 k
1 M 1.000000 M
10 M 10.00000 M
100 M 100.0000 M
[1]
1.000000 G
1.0 G
[1] 8846A Only
8846A Accuracy
Accuracy is given as
Range
10
100
1 k
10 k
100 k
1 M
10 M
100 M
1 G
1-14
4½ Digits
1 m
10 m
100 m
1
10
100
1 k
10 k
100 k
(% measurement + % of range)
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
for 2 x 4-wire resistance function.
all other ranges
frequency 0.1 %
100 dB for NPLC of 1 or greater with analog filter on and power line
frequency 0.1 %
hour of using the ZERO function for that range and NPLC setting.
Resolution
5½ Digits
100 10
1 m 100
10 m 1 m
100 m 10 m
1 100 m
10 1
100 10
1 k 100
10 k 1 k
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
, 100 , 1 k ranges. 1 k per lead on
unbalance)
Source Current
6½ Digits
5 mA/13 V
1 mA/6 V
1 mA/6 V
100 A/6 V
100 A/13 V
10 A/13 V
1 A/13 V
1 A || 10 M /10 V
1 A || 10 M /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