Noise Pickup
To minimize noise pickup, keep cables, the setup, and the DUT away from any electromagnetic noise sources such as motors, transformers, and cathode ray tubes (CRTs). Avoid frequency sources around 91 Hz, 1 kHz, 10 kHz, and the respective harmonics, because these frequencies are the frequencies of the excitation currents used by the NI 4072. Use shielded cable (BNC connectors and coaxial cable are recommended) for cabling and for connecting the external conductor to the LO input of the DMM.
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Note For more information about using the NI 4072 as part of an automated test equipment (ATE) system, refer to the Switching Capacitance and Inductance section. |