Section 4
08 November 2022
2 November, 2016
4-4
Where:
R
a
is the 10:1 ratio
R
b
is the 2.5:1 ratio
R
c
is the 10:2.5 ratio
6. For the second 10:1 ladder up closure error (1k:100), the 10:1 ratio must agree to
within the specification of the nominal ratio for either directly measuring the 10:1
ratio, or calculating the ratio from the product of the 10:4 ratio and the 4:1 ratio, as
follows:
e
i
= (1/3) x
R
a
– (R
b
x R
c
)
/R
a
x 10
6
Where:
R
a
is the 10:1 ratio
R
b
is the 4:1 ratio
R
c
is the 10:4 ratio
7. For the 100:1 ladder up closure error (1k:10), the 100:1 ratio must agree to within the
specification of the nominal ratio for either directly measuring the 100:1 ratio, or
calculating the ratio from the product of the 100:10 ratio and the 10:1 ratio, as
follows:
e
i
= (1/3) x
R
a
– (R
b
x R
c
)
/R
a
x 10
6
Where:
R
a
is the 100:1 ratio
R
b
is the 100:10 ratio
R
c
is the 10:1 ratio
8. The maximum allowable ladder up errors (parts per 10
6
) for the following resistor sets
are:
Resistor Resistor Resistor
Interchange Closure Error
6622A
6622A-XP
6622A-XR
6622A-XPR 6622A-HV
10
Ω
25
Ω
100
Ω
0.2
0.1
0.2
0.1
0.1
100
Ω
400
Ω
1 k
Ω
0.2
0.1
0.2
0.1
0.1
10
Ω
100
Ω
1 k
Ω
0.2
0.1
0.2
0.1
0.1
Summary of Contents for 6622A Series
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