13 | 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
Short offset Zs
Table 16. Impedance of DUT > 1.08 Ω
Test
frequency [Hz]
Measurement time mode
SHORT
MED, LONG
20 - 2 M
2.5 mΩ × (1 + 0.400/Vs) ×
0.6 mΩ × (1 + 0.400/Vs) ×
√
√
(1 + (1000/Fm))
(1 + (1000/Fm))
Table 17. Impedance of DUT ≤ 1.08 Ω
Test
frequency [Hz]
Measurement time mode
SHORT
MED, LONG
√
√
0.2 mΩ × (1 + 1/Vs) × (1 + (1000/Fm))
20 - 2 M
1 mΩ × (1 + 1/Vs) × (1 + (1000/Fm))
Vs [Vrms]
Fm [Hz]
Test signal voltage
Test frequency
Effect of cable extension (Short offset)
Table 18. When the cable is extended, the following value is added to Zs
(independent of the measurement time mode).
Test
Cable length
frequency [Hz]
0 m
0
1 m
2 m
4 m
20 - 1 M
0.25 mΩ
1 mΩ
0.5 mΩ
2 mΩ
1 mΩ
4 mΩ
1 M - 2 M
0
Open offset Yo
Table 19. Test signal voltage ≤ 2.0 Vrms
Test
frequency [Hz]
Measurement time mode
SHORT
MED, LONG
√ √
2 nS × (1 + 0.100/Vs) × (1 + (100/Fm)) 0.5 nS × (1 + 0.100/Vs) × (1 + (100/Fm))
20 - 100 k
100 k - 1 M
1 M - 2 M
20 nS × (1 + 0.100/Vs)
40 nS × (1 + 0.100/Vs)
5 nS × (1 + 0.100/Vs)
10 nS × (1 + 0.100/Vs)
Table 20. Test signal voltage > 2.0 Vrms
Test
frequency [Hz]
Measurement time mode
SHORT
MED, LONG
√
√
20 - 100 k
100 k - 1 M
1 M - 2 M
2 nS × (1 + 2/Vs) × (1 + (100/Fm))
0.5 nS × (1 + 2/Vs) × (1 + (100/Fm))
5 nS × (1 + 2/Vs)
20 nS × (1 + 2/Vs)
40 nS × (1 + 2/Vs)
10 nS × (1 + 2/Vs)
Vs [Vrms]
Fm [Hz]
Test signal voltage
Test frequency
Note
The Open Offset may become three times greater
in the ranges of 40 to 70 kHz and 80 to 100 kHz
due to residual response.
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