14 | Keysight | 4285A Precision LCR Meter – Data Sheet
7. From Table 1-1, the actual accuracy equation to be applied is determined as A1.
Then,
2
)
f
30
50
|Zm|
f
.
.
.
.
A1 = N % + ———
3% + ——— [0.02% + ——— 0.1%] Ki Kosc
(
(
30
)
1
8. Determine N1 from Table 1-2.
From frequency = 25.2 MHz, then, N1 = 0.3.
9. Then,
2
)
25.2
30
50
|35|
25.2
.
. . .
3% + ——— [0.02% + ———— 0.1%] 1 1
An = 0.3% + ————
(
(
)
30
≈ 2.6 [%]
10. Cable length is 0 m, then Ac = 0.
11. Operating temperature is 28 °C, then Kt = 1 (from Figure 1-5).
12. Therefore, inductance measurement accuracy Ae is:
Ae = ±(An + Ac) x Kt
= ±(2.6 + 0) x 1
= ±2.6 [%]
Determine Q measurement accuracy Q
1. From Q Accuracy (see page 6), Q measurement
accuracy Qe is determined as below:
e
Qx2 x De
Qe = ± ————————
1 ±Qx x De
2. Determine D accuracy De for calculating Qe. From the previous step Determine
inductance measurement accuracy Ae (see page 10), Ae is 2.6 [%], then:
Ae
De = ± ————
100
= ± 0.026
3. Therefore Qe is:
Qx2 x De
Qe = ± ————————
1 ±Qx x De
302 X 0.026
Qe = ± ———————————
1 ±30 x 0.026
≈ +106/–13
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