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前几天用过REW测阻抗,根据说明文档这一段:
Impedance Measurement Quality
The main source of measurement noise is acoustic noise and vibration during the measurement. Loudspeakers act as microphones, generating small voltages in response to sounds and vibrations that are picked up as part of the load voltage. To minimise this effect use high drive levels, low sense resistor values, avoid noisy environments and isolate the loudspeaker from vibration. Using a power amplifier to drive the speaker provides high signal levels and allows a low series resistor to be used.
需要高驱动低Rsense以避免噪声,另外电阻精度也是个问题。 |
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