The Keysight / Agilent 346B is a highly accurate, broadband RF noise source covering the 10 MHz to 18 GHz frequency range. It features a nominal Excess Noise Ratio (ENR) of 15 dB and provides ultra-low SWR to significantly minimize test signal reflections and measurement uncertainty. Designed as an ideal companion to noise figure analyzers, the 346B includes individually calibrated ENR values and standard 3.5 mm (m) output connectors, with options for specific high ENR applications and various connector types.
Specifications
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Dimensions (W×H×D) | 21 × 30 × 140 mm |
| Weight | 0.108 kg |
| Shipping Weight | 0.5 kg |
General Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 10 MHz - 18 GHz |
| Nominal Impedance | 50 Ω |
Excess Noise Ratio (ENR) Specifications
| Parameter | Value |
|---|---|
| Nominal ENR | 15.2 dB |
| ENR Temperature Coefficient | < 0.009 dB/°C |
| ENR Voltage Coefficient | < 0.002 dB/%ΔV |
VSWR & Reflection Specifications
| Parameter | Value |
|---|---|
| Maximum VSWR (Source ON/OFF) | 1.30:1 (10 - 30 MHz); 1.15:1 (30 MHz - 5 GHz); 1.25:1 (5 - 18 GHz) |
Power & Drive Requirements
| Parameter | Value |
|---|---|
| Drive Voltage | 28.0 Vdc ± 1 V |
| Drive Current (Maximum) | 60 mA peak |
Connectors & Interfaces
| Parameter | Value |
|---|---|
| RF Output Connector | 3.5 mm (m) standard |
| Drive Input Connector | BNC (f) |
Options & Configurations
| Parameter | Value |
|---|---|
| Option 001 | Type-N (m) RF Output Connector |
| Option 002 | APC-7 RF Output Connector |
| Option 004 | Type-N (f) RF Output Connector |
| Option H42 | Designed for measuring Direct Broadcast Satellite (DBS) LNB converters |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -55 °C to +75 °C |
Calibration Uncertainties
| Parameter | Value |
|---|---|
| Calibration Uncertainty (10 MHz to 1.5 GHz) | ±0.15 dB (RSS) |
| Calibration Uncertainty (1.5 GHz to 3.0 GHz) | ±0.17 dB (RSS) |
| Calibration Uncertainty (3.0 GHz to 7.0 GHz) | ±0.19 dB (RSS) |
| Calibration Uncertainty (7.0 GHz to 18.0 GHz) | ±0.25 dB (RSS) |
Technology
Avalanche Diode Noise Source
Applications
Noise Figure Measurements, RF & Microwave Calibration