08 | Keysight | 4285A Precision LCR Meter – Data Sheet
R accuracy
p
Rp accuracy Rpe is given as
Rpx X De
—————————
Rpe = ±
[Ω]
Dx + De
where:
Rpx = Measured Rp value [Ω]
Dx = Measured D value
De = D accuracy
Rp accuracy applies when Dx (measured D value) ≤ 0.1.
R accuracy
s
Rs accuracy Rse is given as
Rse = ± Xx X De [Ω]
1
——————
Xx = 2 πfLx =
(
)
2 πfCx
where:
Xx = Measured X value [Ω]
Cx = Measured C value [F]
Lx = Measured L value [H]
De = D accuracy
f
= Test frequency [Hz]
Rs accuracy applies when Dx (measured D value) ≤ 0.1.
Basic accuracy equations
The basic accuracy An is calculated from the
following procedure:
1. Determine An equation from Figure 1-3 or Figure 1-4. In both charts, boundary line
belongs to the better accuracy area.
When the oscillator level is ≤ 1 Vrms, determine An to be applied, value of Ki and value of
Kosc from the Figure 1-3. If the determined Kosc ≤ 1, then round up Kosc to 1.
When the oscillator level is > 1 Vrms, determine An to be applied and value of Ki from the
Figure 1-4.
2. Calculate An from the formula to be applied. The n accuracy factor included in the An
equation is shown in Table 1-2. Use Ki and Kosc factors determined in previous step.
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