Atec Agilent-E4980A - Manual (Page 12)

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Effect by impedance of DUT
Table 14. For impedance of DUT below 30 Ω, the following value is added.
Test Impedance of DUT
frequency [Hz] 1.08 Ω ≤ |Zx| < 30 Ω |Zx| < 1.08 Ω
20 - 1 M 0.05% 0.10%
1 M - 2 M 0.10% 0.20%
Table 15. For impedance of DUT over 9.2 k Ω, the following value is added.
Test Impedance of DUT
frequency [Hz] 9.2 kΩ < |Zx| ≤ 92 kΩ 92 kΩ < |Zx|
10 k - 100 k 0% 0.05%
100 k - 1 M 0.05% 0.05%
1 M - 2 M 0.10% 0.10%
Effect of cable extension
When the cable is extended, the following element is added per one meter.
0.015 % × (Fm/1 MHz) 2 × (L_cable) 2
Fm [Hz] Test Frequency
L_cable [m] Cable length