The Keysight N8481A is a high-performance thermocouple RF power sensor designed for accurate power measurements over a wide frequency range of 10 MHz to 18 GHz. Featuring excellent linearity, low SWR, and built-in calibration factor EEPROM (or option CFT with printed calibration factors), it offers high reliability and compatibility with EPM, EPM-P, and P-Series power meters.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Multi-pin sensor cable interface |
| Display | None (requires host power meter) |
| Sensor Type | Thermocouple |
| Recommended Calibration Cycle | 1 year |
| Compatible Sensor Cables | Keysight 11730 series |
| Maximum Sensor Cable Length | 61 m (200 ft) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered directly from compatible power meter |
| Operating Temperature | 0 °C to 55 °C |
Performance & Measurement Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 10 MHz to 18 GHz |
| Power Measurement Range | -35 dBm to +20 dBm (300 nW to 100 mW) |
| Maximum Continuous Wave Power | +25 dBm (300 mW) average |
| Input Impedance | 50 Ω nominal |
Accuracy & Calibration
| Parameter | Value |
|---|---|
| Zero Set | ±25 nW |
| Zero Drift | ±3 nW (within 1 hour, at constant temperature after 1-hour warm-up) |
Physical & Interface Characteristics
| Parameter | Value |
|---|---|
| RF Connector | Type-N male, 50 Ω |
System Compatibility & Control
| Parameter | Value |
|---|---|
| Compatible Power Meters | Keysight E4418B, E4419B, N1913A, N1914A, E4416A, E4417A, N1911A, N1912A |
| EEPROM Calibration Memory | Yes, built-in (stores calibration factors for automatic upload to power meter) |
Ordering Information & Options
| Parameter | Value |
|---|---|
| Option CFT Compatibility | Available (Option CFT provides calibration factor table printed on the sensor body to emulate legacy 8480 series) |
Technology
Thermocouple
Applications
RF & Microwave Power Measurement