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The HP 8970A automatic noise figure meter makes accurate and repeatable noise figure measurements. RF and microwave (with an external local oscillator) measurements from 10 MHz to at least 26.5 GHz are equally simple; any IF between 10 and 1500 MHz may be used. The ENR (Excess Noise Ratio) calibration table of the noise source may be stored in the HP 8970A, and a properly interpolated value is automatically used at each frequency. Automatic second stage correction makes accurate noise figure readings possible even for low gain devices. The HP 8970A's dynamic range allows it to measure either gain up to at least 40 dB (higher in some cases) or loss to -20 dB, with no external attenuation or amplification required. Accuracy is greatly enhanced because the HP 8970A measures its own noise figure (and that of the rest of the measurement system) at up to 81 points. The HP 8970A has an LED digital front panel display. For swept display of noise figure and gain on an oscilloscope, or x-y recorder, rear panel BNC connectors are available. Specifications. Noise figure measurement range: 0 to 30 dB. Noise figure instrumentation uncertainty: ±0.1 dB for 0 to 55° C. Noise figure resolution: 0.01 dB (0.001 dB over HP-IB) . Gain measurement range: -20 to at least 40 dB. Gain instrumentation uncertainty: ±0.2 dB. Gain resolution: 0.01 dB (0.001 dB over HP-IB). Frequency range: tunable from 10 to 1500 MHz. Tuning accuracy: (from 10 to 40°C) ± (1 MHz + 0.01 X freq .), 6 MHz maximum. Frequency resolution: 1 MHz. Noise figure: (for input power levels below -60 dBm) <7 dB + 0.003 dB/ MHz. Maximum operating input power: -10 dBm.
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