Current Derating Factors - Fluke 5725A Instruction Manual

Nominal Value
SHORT
1
1.9
10
19
100
190
1 k
1.9 k
10 k
19 k
100 k
190 k
1 M
1.9 M
10 M
19 M
100 M
Notes:
,
1. For I < I errors occur due to thermally generated voltages w
L
i i
equat on to determ ne the error, and add th
i i i
spec f cat on.
I I I
Error = K( - )/( x
L L
Where: Error i s i n m
four-w i re values.
i
K s the constant from the above table;
I and I are expressed
L
I I
and are expressed
L
2. For I < I < I errors occur due to self-heat
U MAX
equat i on to determ i ne the error
spec i f i cat i on.
2
Error i n ppm = K( I - I
U
i
Where: K s the constant from the above table;
I and I are expressed
U
I I
and are expressed
U
Table 1-12. Current Derating Factors
Value of Derating Factor K for Over or Under Current
Two-Wire Comp
I I
<
L
[Note 1]
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
5000
5000
i
s error to the correspond
I
)
for all two-w i re comp values and four-w
i n mA for short to 1.9 k ;
i
n A for 10 k to 100 M
i ng of the res
i n ppm and add th
2
)
i n mA for short to 19 k ;
i
n A for 100 k to 100 M
Introduction and Specifications
Four-Wire
I I
<
L
[Note 1]
0.3
300
160
30
16
3.5
2.5
0.4
0.4
50
50
7.5
4.0
1.0
0.53
0.2
0.53
0.1
i th i n the 5720A. Use the follow
i
ng uncerta
i re short, and i
i stors i n the cal i brator. Use the following
i s error to the correspond i
Resistance Specifications
Four-Wire
I I I
< <
U max
[Note 2]
-5
4 x10
-4
1.5 x 10
-3
1.6 x 10
-3
3 x 10
-2
1 x 10
-2
1.9 x 10
0.1
0.19
2.0
3.8
-5
2 x 10
-5
3.8 x 10
-4
1.5 x 10
-4
2.9 x 10
-3
1 x 10
-3
1.9 x 10
i ng
i i i
nty or stab l ty
n ppm for the rema i n i ng
ng uncerta i nty or stab i l i ty
1
1-19