Resistance Specifications - Fluke A40B Instruction Manual

A40B
Instruction Manual

Resistance Specifications

Shunt Nominal
Current
1 mA
10 mA
20 mA
50 mA
100 mA
200 mA
500 mA
1 A
2 A
5 A
10 A
20 A
50 A
100 A
[1] Stability specification combines long term change due to aging (permanent) and short term fluctuation due to humidity
changes when shunts are used and stored within specified humidity limits. Add 20 (±μΩ/Ω) if humidity is >50 % RH).
[2] Assume rectangular distribution when combining with other uncertainty contributions.
[3] Calibrated resistance values include the effects of power coefficient at the nominal current. For currents other than nominal,
apply an additional uncertainty for the power coefficient from:
Adder
6
Maximum
Deviation
Nominal
from Nominal
Resistance
Resistance
(Ohms)
[2]
(±μΩ/Ω)
800 250
80 250
40 250
16 250
8 250
4 250
1.6 250
0.8 250
0.4 250
0.16 250
0.08 250
0.04 250
0.016 250
0.008 250
=
Power _ Coefficien t _ Multiplier
Approximate
Uncertainty of
12 Month
Calibrated
Stability
Value at 95 %
[1][2]
Confidence (±μΩ/Ω)
(±μΩ/Ω) TCal
±1°C
8.2 18
6.8 18
8.2 18
8.3 18
8.3 18
8.6 18
9.6 18
9.3 18
9.4 18
9.9 18
15 18
14 18
24 18
28 18
 
2
 I 
   
 Applied 
× −
1
I
 
 
 
No min al
Power
Temperature
Coefficient
Coefficient
Multiplier
[2]
(±μΩ/Ω/ºC)
[2][3]
(±μΩ/Ω)
5 1
2.5 1
4.5 1
4.5 1
2.5 2
3.5 4
4.5 13
4.5 26
4.5 26
4.5 30
4.5 65
4.5 78
4.5 105
4.5 105