High impedance circuitry is susceptible to electrostatic interference, so use shielding to avoid noise pickup. The device under test, as well as the connecting cables, should be well shielded.

• 高阻电路对静电干扰很敏感，因此要采取屏蔽措施，以免拾取噪声。被测装置以及连接电缆都应该屏蔽良好。