Atec Gigatronics-8003 - Manual (Page 5)

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8003 Technical Specifications
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Reflection Measurements: When measuring devices with high return loss (>10 dB), reflection accuracy is typically dominated by the
effective system directivity (Fig. 2), instrument linearity errors, and noise uncertainty. With low return loss devices (<10 dB), reflection
accuracy is typically dominated by source match (Fig. 3). Calibration with an open and short effectively removes uncertainties due to
frequency response of the source, sensors, and signal splitting device.
Reflection Accuracy = Instrument Accuracy + Reflection Bridge Accuracy