AT381x User's Guide
122
13.
Accuracy
This chapter includes the following:
•
Accuracy
•
Accuracy Factor
Measurement accuracy includes errors such as measurement stability, temperature coefficient,
linearity, measurement repeatability, etc.
The accuracy of the instrument measurement must be checked under the following
conditions:
Warm-
up time: ≥ 20 minutes.
After warming up, open circuit and short circuit correction are performed.
The instrument is in Auto range.
13.1
Accuracy
13.1.1
Accuracy for L, C, R, |Z|
Accuracy for L, C, R, |Z|Ae are expressed by the following formula
：
A
e
= ±[A+（
K
a
+K
b
）
×100]×K
c
[%]
A
：
Basic measurement accuracy
K
a
：
Impedance scale factor
K
b
：
Impedance scale factor)
K
c
：
Temperature factor
L
，
C Accuracy conditions
：
D
x
（
D measuring value
）≤0.1
R Accuracy conditions
：
Q
x
（
Q measuring value
）≤0.1
When Dx ≥ 0.1,
for L, C accuracy factor A
e
should be multiplied by
2
1
x
D
+
When Q
x
≥0.1，
for R accuracy factor A
e
should be multiplied by
2
1
x
Q
+
13.1.2
D Accuracy
D 13.1.1 accuracy D
e
are given by the following formula
：
D
e
=
100
e
A
±
The above formula is only used when D
x
≤ 0.1.
When D
x
>0.1, D
e
should be multiplied by (1+Dx)
13.1.3
Q Accuracy
Q accuracy are given by the following formula
：
Q
e
=
e
x
e
x
D
Q
D
Q
×
×
±
1
Here, Q
x
is the measured Q value.
D
e
is accuracy of D