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The perfect addition to Keysight's noise figure solutions is the Keysight 346A noise source. It does not require many sources in various frequency bands because it is broadband (10 MHz to 18 GHz). By minimizing test signal reflection, the noise source's low SWR lowers measurement uncertainty. The extremely tiny change in reflection coefficient (<0.01) from ON to OFF is specifically made to accurately characterize devices that are sensitive to input impedance, such as GaAsFETs and several UHF amplifiers.
| ENR Range | 4.5 to 6.5 dB | ENR Automatic Download | No |
| Excess Noise Ratio (ENR) | 5 - 7 dB | Frequency Range | 10 MHz to 18 GHz |
| Maximum Frequency | 18 GHz | Minimum Frequency | 10 MHz |
| Minimum Frequency Range | 10 MHz | Temperature Compensation | No |
| Type | Noise Source | Works With | NFA, ESA - E Series, PNA - X, PSA Series, X - Series (PXA, MXA, EXA, CXA) |
| Keysight 346A | Keysight 346B | Keysight 346C |
|---|---|---|
| Reflection coefficient differential between on and off states is specified to be no greater than 0.01 | Reflection coefficient differential between on and off states is not specified, but is less than 0.1 typically | Reflection coefficient differential between on and off states is not specified, but is less than 0.1 typically |
| Specified output noise spectrum from 10 MHz to 18 GHz | Specified output noise spectrum from 10 MHz to 18 GHz | Specified output noise spectrum from 10 MHz to 26.5 GHz |
| Nominal ENR is 6 dB over the specified frequency range | Nominal ENR is 15 dB over the specified frequency range | Nominal ENR is 15 dB over the specified frequency range |
| Not directly usable for Keysight 8970A IF attenuator calibration (Special Function 33). 10 dB of gain is required | Suitable for Keysight 8970A IF attenuator calibration (Special Function 33) | Suitable for Keysight 8970A IF attenuator calibration (Special Function 33) |
| Not directly usable for Keysight 8970B IF attenuator calibration. Refer to "Calibration, IF Attenuators" in the Keysight 8970B Operating Manual | Suitable for Keysight 8970B IF attenuator calibration. Refer to "Calibration, IF Attenuators" in the Keysight 8970B Operating Manual | Suitable for Keysight 8970B IF attenuator calibration. Refer to "Calibration, IF Attenuators" in the Keysight 8970B Operating Manual |
