Atec Agilent-E4980A - Manual (Page 11)

11
Example of C-D accuracy calculation
Measurement conditions
Test Frequency: 1 kHz
Measured C value: 100 nF
Test signal voltage: 1 Vrms
Measurement time mode: Medium
Measurement temperature: 23 °C
Ab = 0.05%
|Zm| = 1 / (2π Ч 1 Ч 10
3 Ч 100 Ч 10 -9 ) = 1590 Ω
Zs = 0.6 mΩ Ч (1 + 0.400/1) Ч (1 + √(1000/1000) = 1.68 mΩ
Yo = 0.5 nS Ч (1 + 0.100/1) Ч (1 + √(100/1000) = 0.72 nS
C accuracy: Ae = [0.05 + 1.68 m/1590 × 100 + 0.72 n Ч 1590 Ч 100] Ч 1 = 0.05%
D accuracy: De = 0.05/100 = 0.0005
Basic accuracy
Basic accuracy Ab is given below.
Table 12. Measurement time mode = SHORT
Test signal voltage
Test 5 mVrms - 50 mVrms - 0.3 Vrms - 1 Vrms - 10 Vrms -
frequency [Hz] 50 mVrms 0.3 Vrms 1 Vrms 10 Vrms 20 Vrms
20 - 125 (0.6%) × 0.60% 0.30% 0.30% 0.30%
(50 mVrms/Vs)
125 - 1 M (0.2%) × 0.20% 0.10% 0.15% 0.15%
(50 mVrms/Vs)
1 M - 2 M (0.4%) × 0.40% 0.20% 0.30% 0.30%
(50 mVrms/Vs)
Table 13. Measurement time mode = MED, LONG
Test signal voltage
Test 5 mVrms - 50 mVrms - 0.3 Vrms - 1 Vrms - 10 Vrms -
frequency [Hz] 50 mVrms 0.3 Vrms 1 Vrms 10 Vrms 20 Vrms
20 - 100 (0.25%) × 0.25% 0.10% 0.15% 0.15%
(30 mVrms/Vs)
100 - 1 M (0.1%) × 0.10% 0.05% 0.10% 0.15%
(30 mVrms/Vs)
1 M - 2 M (0.2%) × 0.20% 0.10% 0.20% 0.30%
(30 mVrms/Vs)
Vs [Vrms] Test signal voltage