11 | 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
Example of C-D accuracy calculation
Measurement conditions
Test Frequency:
1 kHz
Measured C value:
Test signal voltage:
Measurement time mode:
100 nF
1 Vrms
Medium
Measurement temperature: 23 °C
Ab = 0.05%
|Zm| = 1 / (2π × 1 × 103 × 100 × 10-9) = 1590 Ω
√
Zs = 0.6 mΩ × (1 + 0.400/1) × (1 + (1000/1000) = 1.68 mΩ
√
Yo = 0.5 nS × (1 + 0.100/1) × (1 + (100/1000) = 0.72 nS
C accuracy: Ae = [0.05 + 1.68 m/1590 × 100 + 0.72 n × 1590 × 100] × 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
Test signal voltage
frequency [Hz]
5 mVrms -
50 mVrms
50 mVrms - 0.3 Vrms -
1 Vrms -
10 Vrms
10 Vrms -
20 Vrms
0.3 Vrms
1 Vrms
20 - 125
125 - 1 M
1 M - 2 M
(0.6%) ×
(50 mVrms/Vs)
0.60%
0.30%
0.30%
0.15%
0.30%
0.30%
0.15%
0.30%
(0.2%) ×
(50 mVrms/Vs)
0.20%
0.40%
0.10%
0.20%
(0.4%) ×
(50 mVrms/Vs)
Table 13. Measurement time mode = MED, LONG
Test
Test signal voltage
frequency [Hz]
5 mVrms - 50
mVrms
50 mVrms - 0.3 Vrms -
1 Vrms -
10 Vrms
10 Vrms -
20 Vrms
0.3 Vrms
1 Vrms
20 - 100
100 - 1 M
1 M - 2 M
(0.25%) ×
(30 mVrms/Vs)
0.25%
0.10%
0.15%
0.10%
0.20%
0.15%
0.15%
0.30%
(0.1%) ×
(30 mVrms/Vs)
0.10%
0.20%
0.05%
0.10%
(0.2%) ×
(30 mVrms/Vs)
Vs [Vrms]
Test signal voltage
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