Atec Agilent-E4980A - Manual (Page 9)

9
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 (Agilent 16047A/B/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 Condition 1
≤ 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)
> 1 MHz 70 mA - 0.0015 × Vac × (Fm / 1 MHz) × (L_cable + 0.5)
Vac [V] Test signal voltage
Fm [Hz] Test frequency
L_cable [m] 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: Magnetic flux density [Gauss]
Vs: 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| Ч 100 ] Ч Kt
Zm Impedance of DUT
Ab Basic accuracy
Zs Short offset
Yo Open offset
Kt Temperature coefficient
D accuracy
D accuracy De is given as
• when Dx ≤ 0.1
Equation 9. De = ±Ae/100
Dx Measured D value
Ae Relative accuracies of |Z|, |Y|, L, C, R, X, G, and B
• when Dx > 0.1, multiply De by (1 + Dx)
1. When the calculation result is a negative value,
0 A is applied.