The Keysight (Agilent HP) 11940A is a passive, close-field magnetic (H-field) probe designed for EMI/EMC troubleshooting and diagnostic measurements over the frequency range of 30 MHz to 1 GHz. Featuring a unique dual-loop design, it provides exceptional rejection of electric (E-field) fields, ensuring highly localized and accurate magnetic field measurements. Each probe is individually calibrated, with its unique antenna factor calibration curve printed directly on the probe body for convenient and precise measurement conversion.
Specifications
Physical
| Parameter | Value |
|---|---|
| Power Supply | Passive (none required) |
| Operating Temperature | 0 °C to 55 °C |
| Dimensions (W×H×D) | 46 mm × 140 mm × 19 mm |
| Weight | 0.11 kg |
Electrical Performance
| Parameter | Value |
|---|---|
| Frequency Range | 30 MHz to 1 GHz |
| Probe Type | H-Field (Magnetic Field) |
| Sensor Design | Dual-loop (for common-mode E-field rejection) |
| Nominal Impedance | 50 ohms |
| Maximum Continuous Input RF Power | 0.5 W (+27 dBm) |
| Output Connector Type | SMA female |
Calibration & Traceability
| Parameter | Value |
|---|---|
| Calibration Type | Individually calibrated; antenna factors plotted on probe handle |
| Calibration Accuracy | ±2 dB (typical) |
System Compatibility & Accessories
| Parameter | Value |
|---|---|
| Compatible Equipment | Spectrum Analyzers, EMI Receivers, Oscilloscopes |
| Related Probe Set | HP 11945A Close-Field Probe Set |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +75 °C |
| Operating Humidity | 95% RH @ 40 °C |
Electrical
| Parameter | Value |
|---|---|
| Maximum Safe DC Current | 0.5 A |
| Maximum Safe Electric Field | 1000 V/m |
Technology
Passive Near-Field Probing
Applications
EMI/EMC Diagnostic and Pre-compliance Testing