The Keysight 346A, 346B, and 346C noise source produce noise output (power-on) when +28 V is applied. When it is off, there is residual noise due to thermal agitation in the noise source (power-off). These two noise levels are used to measure the gain and added noise of the device under test and, consequently, its noise figure. The 364 noise source family specification list the uncertainty of the ENR data.
All 3 models are provided with a BNC female connector for power input. The output connector is a male APC-3.5 on the standard noise sources. Type-N connectors are available as options for the Keysight 346A and 346B noise sources. In addition to these general characteristics, certain characteristics apply to the specific models.
The Keysight 346A noise source (10 MHz to 18 GHz) with a 6dB ENR is designed especially for accurate characterization of input-impedance-sensitive devices.
The Keysight 346A noise source is the ideal companion to Keysight's noise figure solutions. Since it is broadband (10 MHz to 18 GHz), it eliminates the necessity for several sources at different frequency bands. The low SWR of the noise source minimizes reflection of test signals, reducing measurement uncertainty. The very small change in reflection coefficient (<0.01) from ON to OFF is designed especially for accurate characterization of input-impedance-sensitive devices (like GaAsFETs and many UHF amplifiers).
| KEY FEATURES |
| Frequency range: 10 MHz to 18 GHz |
| VSWR: < 1.3:1 |
| Connectors: BNC (f) input bias / 3.5 mm (m) |
| Low SWR for reducing noise figure measurement uncertainty |
| Individually calibrated ENR values at specific frequencies |
| SPECIFICATIONS |
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| Model: 346x Noise Source Series Overview |
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| Model | Frequency Range | Connector | Typical ENR |
| 346A | 10 MHz – 18 GHz | APC-3.5 mm (m) | 6 dB |
| 346B | 10 MHz – 18 GHz | APC-3.5 mm (m) | 15 dB |
| 346C | 10 MHz – 26.5 GHz | APC-3.5 mm (m) | 12–17 dB |
| 346CK40 | 1 GHz – 40 GHz | 2.4 mm (m) | ~20 dB @ 1 GHz, decreasing with frequency |
| 346CK01 | 1 GHz – 50 GHz | 2.4 mm (m) | ~20 dB @ 1 GHz, ~7 dB @ 50 GHz |
| SPECIFICATIONS |
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| Model: 346x Noise Source Series Overview |
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| Model | Description |
| 346A | The Keysight 346A noise source (10 MHz to 18 GHz) with a 6dB ENR is designed especially for accurate characterization of input-impedance-sensitive device |
| 346B | The Keysight 346B noise source's high ENR (15dB), low SWR, and variety of connectors make it a general-purpose noise source for the range 10 MHz to 18 GHz. |
| 346C | The Keysight 346C noise source offers 10 MHz to 12 GHz coverage with a 16 dB ENR or 12 GHz to 26.5 GHz coverage with a 17 dB ENR. |
| 346CK01 | The Keysight 346CK01 is the ideal companion to Keysight's noise figure solutions when working on high-frequency applications. |
| 346CK40 | The Keysight 346CK40 is the ideal companion to Keysight´s noise figure solutions when working on high frequency applications.
Since it is broadband (1 GHz to 40 GHz), it eliminates the necessity for several sources at different frequency bands.
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