Fluke 8845A, Руководство пользователя

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8845A/8846A
Users Manual
1-14
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 m
Ω
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 k
Ω
ranges. 1 k
Ω
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 k
Ω
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 m
Ω
100
μΩ
10
μΩ
5 mA/13 V
100
Ω
100.0000
Ω
10 m
Ω
1 m
Ω
100
μΩ
1 mA/6 V
1 k
Ω
1.000000 k
Ω
100 m
Ω
10 m
Ω
1 m
Ω 1 mA/6 V
10 k
Ω
10.00000 k
Ω
1
Ω
100 m
Ω
10 m
Ω
100
μ
A/6 V
100 k
Ω
100.0000 k
Ω
10
Ω
1
Ω
100 m
Ω
100
μ
A/13 V
1 M
Ω
1.000000 M
Ω
100
Ω
10
Ω
1
Ω
10
μ
A/13 V
10 M
Ω
10.00000 M
Ω
1 k
Ω
100
Ω
10
Ω
1
μ
A/13 V
100 M
Ω
100.0000 M
Ω
10 k
Ω
1 k
Ω
100
Ω
1
μ
A || 10 M
Ω
/10 V
1.0 G
Ω [1]
1.000000 G
Ω
100 k
Ω
10 k
Ω
1 k
Ω
1
μ
A || 10 M
Ω
/10 V
[1] 8846A Only
8846A Accuracy
Accuracy is given as
±
(% measu % 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 k
Ω
0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
10 k
Ω
0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
100 k
Ω
0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001
1 M
Ω
0.002 + 0.001 0.008 + 0.001 0.01 + 0.001 0.001 + 0.0002
10 M
Ω
0.015 + 0.001 0.02 + 0.001 0.04 + 0.001 0.003 + 0.0004
100 M
Ω
0.3 + 0.01 0.8 + 0.01 0.8 + 0.01 0.15 + 0.0002
1 G
Ω
1.0 + 0.01 1.5 + 0.01 2.0 + 0.01 0.6 + 0.0002