The Keysight (Agilent) 8490D is a precision coaxial fixed attenuator operating from DC to 50 GHz. It offers flat frequency response, exceptionally low SWR, and stable attenuation across a broad temperature range. Available in nominal values of 3, 6, 10, 20, 30, and 40 dB, this 2.4 mm passive device features swept-frequency verification and comes equipped with an individual calibration nameplate chart.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | None (passive RF coaxial device) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | None (passive device) |
| Operating Temperature | 0 to +75 °C |
| Dimensions (W×H×D) | 52 mm (length) x 13 mm (diameter) |
| Weight | 0.015 |
| Connector Material | Passivated stainless steel |
| Recommended Mating Torque | 0.9 N-m (8 lb-in) |
RF Performance Specifications
| Parameter | Value |
|---|---|
| Frequency Range | DC to 50 GHz |
| Nominal Impedance | 50 Ω |
| Nominal Attenuation Values | 3, 6, 10, 20, 30, 40 dB |
| Maximum Average Input Power | 1 W (up to 55 °C) |
| Power Derating | Derates linearly from 1.0 W at 55 °C to 0.5 W at 75 °C |
| Maximum Peak Input Power | 100 W (for 10 µs pulse width) |
| Maximum SWR (3, 6, 10, 20, 30 dB): DC to 26.5 GHz | 1.15 |
| Maximum SWR (3, 6, 10, 20, 30 dB): 26.5 to 40 GHz | 1.25 |
| Maximum SWR (3, 6, 10, 20, 30 dB): 40 to 50 GHz | 1.45 |
Mechanical & Connector Specifications
| Parameter | Value |
|---|---|
| Connector Type | 2.4 mm |
| Connector Gender | Male to Female (one of each) |
| Overall Length | 52 mm (2.05 in) |
| Diameter | 13 mm (0.51 in) |
| Net Weight | 15 g (0.5 oz) |
Environmental & Reliability Specifications
| Parameter | Value |
|---|---|
| Operating Temperature Range | 0 °C to +75 °C |
Ordering Information & Configurations
| Parameter | Value |
|---|---|
| Base Model Number | 8490D |
| Option 003 | 3 dB nominal attenuation value |
| Option 006 | 6 dB nominal attenuation value |
| Option 010 | 10 dB nominal attenuation value |
| Option 020 | 20 dB nominal attenuation value |
| Option 030 | 30 dB nominal attenuation value |
| Option 040 | 40 dB nominal attenuation value |
Options
| Parameter | Value |
|---|---|
| Option UK6 | Commercial calibration certificate with test data |
Connectors
| Parameter | Value |
|---|---|
| Connector Compatibility | 2.4 mm |
Technology
Coaxial Fixed Attenuator
Applications
RF and microwave signal attenuation, level control, and port matching