The Keysight (formerly Agilent / HP) 8485D is a highly sensitive diode power sensor designed for measuring average power from -70 dBm to -20 dBm over a wide frequency range of 50 MHz to 26.5 GHz. It features an APC-3.5 mm connector and is compatible with a large ecosystem of legacy and modern power meters.
Specifications
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to 55 °C |
RF and Measurement Specifications
| Parameter | Value |
|---|---|
| Sensor Type | Diode |
| Frequency Range | 50 MHz to 26.5 GHz |
| Power Range | -70 dBm to -20 dBm |
| Measurement Type | Average power |
| Nominal Impedance | 50 Ω |
| RF Connector Type | APC-3.5 mm (male) |
Power Handling
| Parameter | Value |
|---|---|
| Maximum Average Power | 100 mW (+20 dBm) |
| Maximum Peak Power | 100 mW (+20 dBm) |
Compatibility
| Parameter | Value |
|---|---|
| Included Accessories | 11708A 30 dB attenuator (for 0 dBm, 50 MHz reference calibration) |
Performance
| Parameter | Value |
|---|---|
| Maximum SWR (50 MHz to 4 GHz) | 1.19 |
| Maximum SWR (4 GHz to 12 GHz) | 1.25 |
| Maximum SWR (12 GHz to 18 GHz) | 1.29 |
| Maximum SWR (18 GHz to 26.5 GHz) | 1.35 |
| Zero Set | ±20 pW |
| Zero Drift (1 hour) | ±4 pW |
| Measurement Noise | 4 pW |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +75 °C |
Calibration
| Parameter | Value |
|---|---|
| Required Calibration Attenuator | Keysight 11708A 30 dB reference attenuator (required for calibrating against standard 0 dBm power meter reference) |
Accessories
| Parameter | Value |
|---|---|
| Compatible Sensor Cables | Keysight 11730 Series (e.g., 11730A, 11730B) |
Technology
Diode Power Sensor
Applications
RF and Microwave Power Measurement
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