14 | Keysight | E4990A Impedance Analyzer 20 Hz to 10/20/30/50/120 MHz - Data Sheet
Impedance measurement accuracy at 7-mm port of the Keysight 42942A
Equation 2 shows the impedance measurement accuracy [%] at 7-mm port of the 42942A terminal adapter.
Equation 2. Impedance Measurement Accuracy [%] at 7-mm port of E4990A
Zs'
Zx
E = Ep' +
+ Yo' × Zx × 100
Where,
Ep' = Epl + Epbw + Eposc + Ep [%]
Yo' = Yol + Kbw × Kyosc × (Yodc + Yo) [S]
Zs' = Zsl + Kbw × Kzosc × Zs [Ω]
Epl [%]
0
Meas Time 5: 0
Meas Time 4: 0.06 at < 50 kHz, 0.03 at ≥ 50 kHz
Meas Time 3: 0.2 at < 50 kHz, 0.1 at ≥ 50 kHz
Meas Time 2: 0.4 at < 50 kHz, 0.2 at ≥ 50 kHz
Meas Time 1: 0.8 at < 50 kHz, 0.4 at ≥ 50 kHz
Epbw [%]
Vosc > 500 mV: f/100 × (Vmv/500-1)
E
posc [%]
100 mV < Vosc ≤ 500 mV: 0
V
osc ≤ 100 mV: (100/Vmv-1) × (0.05 + Epbw)
20 Hz ≤ fm ≤ 15 MHz: 0.6
15 MHz < fm ≤ 120 MHz: 0.95
Ep [%]
Yol [S]
0
Meas Time 5: 1
Meas Time 4: 1
Meas Time 3: 3
Meas Time 2: 4
Meas Time 1: 6
Kbw
Vosc ≥ 500 mV: 1
Kyosc
V
osc < 500 mV: 500/Vmv
DCI range 1 mA: 0
Yodc [S]
DCI range 10 mA: 1 µ
DCI range 100 mA: 10 µ
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