B&K Precision 889B - Manual - Manual (Page 12)

11
Q Accuracy:
De Qx
De Qx
Ae
Q
⋅
⋅
± =
 1
2
Q
Ae
= Ae of Q measurement value
Qx : Measured Quality Factor Value
De : Relative D Accuracy
Accuracy applies when 1
< ⋅ De
Qx
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 1mH
Then
Ω =
−
⋅ ⋅ ⋅ =
⋅ ⋅ ⋅ =
283 . 6
3
10
3
10 2
2
π
π
Lx f Zx
Refer to the accuracy table, get
L
Ae
=±0.5%,
005 . 0
100
± = ⋅ ± =
Ae
De
If measured Qx = 20
Then
1 . 0 1
2
1
2


± =
⋅
⋅
± =
De Qx
De Qx
Ae
Q
θ Accuracy:
100
Ae
π
180 ⋅
=
Ae
θ
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 100nF
Then
Ω =
−
⋅ ⋅ ⋅ ⋅
=
⋅ ⋅ ⋅
=
1590
9
10 100
3
10 2
1
2
1
π
π
Cx f
Zx
Refer to the accuracy table, get
Z
Ae
=±0.1%,
deg 057 . 0
100
1 . 0 180
100
180
± = ⋅ ± =
⋅ ± =
π
π
θ Ae
Ae