09 | Keysight | E4980A Precision LCR Meter 20 Hz to 2 MHz, E4980AL Precision LCR Meter 20 Hz to 300 kHz/500 kHz/1 MHz – Data Sheet
Relative accuracy
Relative accuracy includes stability, temperature coefficient, linearity, repeatability, and
calibration interpolation error. Relative accuracy is specified when all of the following
conditions are satisfied:
– Warm-up time: 30 minutes
– Test cable length: 0 m, 1 m, 2 m, or 4 m (Keysight Technologies, Inc. 16048A/D/E)
– A “Signal Source Overload” warning does not appear.
When the test signal current exceeds a value in table 11 below, a “Signal Source
Overload” warning appears.
Table 11.
Test signal voltage Test frequency
Condition1
≤ 2 Vrms
–
–
> 2 Vrms
≤ 1 MHz
The smaller value of either 110 mA or
130 mA - 0.0015 × Vac × (Fm / 1 MHz) × (L_cable + 0.5)
70 mA - 0.0015 × Vac × (Fm / 1 MHz) × (L_cable + 0.5)
> 1 MHz
Vac [V]
Fm [Hz]
L_cable [m]
Test signal voltage
Test frequency
Cable length
– OPEN and SHORT corrections have been performed.
– Bias current isolation: Off
– The DC bias current does not exceed a set value within each range of the DC bias
current
– The optimum impedance range is selected by matching the impedance of DUT to the
effective measuring range.
– Under an AC magnetic field, the following equation is applied to the measurement
accuracy.
A x (1 + B x ( 2 + 0.5 / Vs))
Where
A:
Absolute accuracy
B:
Vs:
Magnetic flux density [Gauss]
Test signal voltage level [Volts]
|Z|, |Y|, L, C, R, X, G, and B accuracy (L, C, X, and B accuracies apply when Dx ≤ 0.1,
R and G accuracies apply Qx ≤ 0.1)
Relative accuracy Ae is given as:
Equation 8.
Ae = [Ab + Zs /|Zm| × 100 + Yo × |Zm| × 100 ] × Kt
Impedance of DUT
Basic accuracy
Zm
Ab
Zs
Yo
Kt
Short offset
Open offset
Temperature coefficient
D accuracy
D accuracy De is given as
– when Dx ≤ 0.1
Equation 9.
De = ±Ae/100
Measured D value
Relative accuracies of |Z|, |Y|, L, C, R, X, G, and B
Dx
Ae
1. When the calculation result is a negative
value, 0 A is applied.
– when Dx > 0.1, multiply De by (1 + Dx)
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