应用文章
Ranging
The U8903B has 6 input ranges spaced at 10 dB intervals. The lowest range is 0.32 vRMS and the highest is 140 vRMS on the unbalanced input or 300 vRMS on the balanced input. This discrete number of ranges is common amongst this type of instrument since each range requires its own switching and calibration.
Potential Measurement Problem
Given the dynamic range of the 24 bit ADC’s within the instrument, it’s generally ok to let the instruments auto ranging feature choose the appropriate range and carry on with the desired measurement.
When making measurements that concern dynamic range to the limits of performance however the user must take care to position the input signal near the top of the most appropriate range. Positioning the input signal at the bottom of a particular range means the signal is 10 dB nearer the noise floor thereby compromising the dynamic range of the measurement.
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