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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| 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 |
0.1 kg (3.5 oz.)
140 × 21 × 31 mm (5.5 × 0.8 × 1.2 in)
The Keysight 346A operates across a wide broadband frequency range spanning from 10 MHz to 18 GHz, eliminating the requirement for multiple noise sources across different measurement bands.
It features an exceptionally small change in reflection coefficient (<0.01) from its ON to OFF states along with a low VSWR (<1.3:1). This minimal reflection variance accurately characterizes devices sensitive to input impedance changes, such as GaAsFETs and UHF amplifiers.
The Keysight 346A provides a lower nominal ENR of 6 dB (with 4.5 to 6.5 dB range) and a strictly specified reflection coefficient difference (≤ 0.01). The 346B and 346C have a nominal 15 dB ENR, and the 346C extends coverage up to 26.5 GHz.
The Keysight 346A is fully compatible with NFA, ESA - E Series, PNA - X, PSA Series, and X-Series analyzers (including PXA, MXA, EXA, and CXA).
The noise source is equipped with a 3.5 mm (male) RF output connector and a BNC (female) input bias connector.
No, the 346A is not directly usable for 8970A IF attenuator calibration (requiring 10 dB of additional gain) and requires specific procedures outlined in the 8970B manual, unlike the 346B and 346C models.
