05 | Keysight | 4285A Precision LCR Meter – Data Sheet
Measurement Accuracy
The measurement accuracy includes stability, temperature coefficient, linearity,
repeatability, and calibration interpolation error. The measurement accuracy is specified
when all of the following conditions are satisfied:
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Warm-up time: ≥ 30 minutes
Test cable length: 0 m, 1 m (Keysight 16048A), or 2 m (Keysight 16048D). For the 1 m
or 2 m cable length operation (with Keysight 16048A/D), CABLE CORRECTION has
been performed
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OPEN and SHORT corrections have been performed.
The optimum measurement range is selected by matching the DUT’s impedance to the
effective measuring range shown in Figure 1-1 and Figure 1-2. (For example, if the
DUT’s impedance is 3 kΩ and oscillator level is less than or equal to 1 V, the optimum
range is the 500 Ω range.)
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Measurement accuracy is specified at the following reference planes:
– Test frequency ≤ 1 MHz
At the UNKNOWN terminals on the Keysight 4285A front panel or at the end of the
standard test leads (Keysight 16048A/D).
– Test frequency ≥ 1.001 MHz
At the 1-port terminal of the Keysight 16085B Terminal Adapter, which should be
connected to the UNKNOWN terminals of the Keysight 4285A or to the end of the
standard test leads (Keysight 16048A/D).
|Z|, |Y|, L, C, R, X, G, and B accuracy
|Z|, |Y|, L, C, R, X, G, and B accuracy Ae is given as
Ae = ±(An + Ac) Kt [%]
where:
An = Basic accuracy equation given from the A1 to A16 shown in Table 1-1. The applicable
frequency range and impedance range of equations A1 to A16 are shown in
Figure 1-3 and Figure 1-4. (Refer to Basic Accuracy Equations on page 7.)
Ac = Cable length factor (Refer to Cable Length Factor on page 10.)
Kt = Temperature factor (Refer to Temperature Factor on page 10.)
L, C, X, and B accuracies apply when Dx (measured D value) ≤ 0.1.
When Dx > 0.1, multiply Ae by 1 + D2x for L, C, X, and B accuracies.
R and G accuracies apply when Qx (measured Q value) ≤ 0.1.
When Qx > 0.1, multiply Ae by 1 + Q2x for R and G accuracies. G accuracy given by the
equation above applies to the G-B combination only.
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