The Keysight (formerly Agilent / HP) 8495A is a manual step attenuator designed for DC to 4 GHz coaxial applications. It offers exceptional repeatability and reliability, with attenuation selectable in 10 dB steps from 0 to 70 dB. Precision gold-plated leaf springs ensure a long operating life of over 5 million cycles per section and high repeatability.
Specifications
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to +55 °C |
RF Performance
| Parameter | Value |
|---|---|
| Frequency Range | DC to 4 GHz |
| Attenuation Range | 0 to 70 dB |
| Attenuation Step Size | 10 dB |
| Insertion Loss (at 0 dB) | 0.4 dB + 0.07 dB/GHz |
| Insertion Loss at 4 GHz | 0.68 dB |
| Maximum SWR | 1.35 |
| Maximum RF Input Power (Average) | 1 W |
| Maximum RF Input Power (Peak) | 100 W (pulse width ≤ 10 µs, duty cycle ≤ 1%) |
| Nominal Impedance | 50 Ω |
| Attenuation Accuracy (10 dB) | ±0.2 dB |
| Attenuation Accuracy (20 dB) | ±0.4 dB |
| Attenuation Accuracy (30 dB) | ±0.5 dB |
| Attenuation Accuracy (40 dB) | ±0.7 dB |
| Attenuation Accuracy (50 dB) | ±0.8 dB |
| Attenuation Accuracy (60 dB) | ±1.0 dB |
| Attenuation Accuracy (70 dB) | ±1.2 dB |
| Maximum Peak Power Pulse Width | 10 µs |
| Maximum Peak Power Duty Cycle | 0.01 |
| Number of Sections | 3 |
Mechanical & Physical
| Parameter | Value |
|---|---|
| RF Connector Options | Type-N female / SMA female / APC-7 |
| Actuation Type | Manual |
| Operating Life | 5 million cycles per section |
| Repeatability (Maximum) | 0.03 dB (up to 5 million cycles) |
| Repeatability (Typical) | 0.01 dB |
Environmental & Reliability
| Parameter | Value |
|---|---|
| Non-Operating Temperature Range | -40 to +75 °C |
Ordering & Configuration
| Parameter | Value |
|---|---|
| Option 001 | Type-N female RF connectors |
| Option 002 | SMA female RF connectors |
| Option 003 | APC-7 RF connectors |
| Option 890 | NIST traceable SWR and attenuation calibration data |
| Compatible Interconnect Kits | Agilent 11716A/B/C (for cascading step attenuators) |
Environmental
| Parameter | Value |
|---|---|
| Operating Altitude | 4600 m |
| Storage Altitude | 15200 m |
| Vibration Limit | 0.38 mm double amplitude, 5 to 55 Hz |
| Shock Limit | 100 g, 6 ms duration |
| Humidity Limit | 95% RH @ 40 °C |
General
| Parameter | Value |
|---|---|
| Control Type | Manual rotary knob |
RF Connectors
| Parameter | Value |
|---|---|
| Connector Gender | Female (Type-N, SMA options) or Sexless (APC-7 option) |
Options
| Parameter | Value |
|---|---|
| Option UK6 | Commercial calibration certificate with test data |
Performance
| Parameter | Value |
|---|---|
| Attenuation Temperature Coefficient | < 0.0001 dB/dB/°C |
Technology
Coaxial Step Attenuator
Applications
RF and microwave signal attenuation