The Keysight (Agilent) 11945A is a close-field probe set designed for electromagnetic compatibility (EMC) measurements and troubleshooting over the 9 kHz to 1 GHz frequency range. It contains two passive, dual-loop magnetic-field (H-field) probes, the 11940A and 11941A, each optimized for specific frequency bands and individually calibrated for high precision. The probes feature exceptional electric-field (E-field) rejection and have their unique calibration factors conveniently plotted directly onto each probe body.
Specifications
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 °C to +55 °C |
| Dimensions (W×H×D) | 279 mm × 102 mm × 337 mm (carrying case) |
| Weight | 1.4 kg |
| Shipping Weight | 2.3 kg |
| Option E51 Net Weight | 3.5 kg |
| Option E51 Shipping Weight | 4.5 kg |
System Performance
| Parameter | Value |
|---|---|
| Combined Frequency Range | 9 kHz to 1 GHz |
Kit Contents
| Parameter | Value |
|---|---|
| Included Probe Models | 11940A (30 MHz to 1 GHz), 11941A (9 kHz to 30 MHz) |
| Probe 1 Model | 11940A |
| Probe 2 Model | 11941A |
| Included Carrying Case | Yes (hard carrying case with custom foam insert) |
11940A Specifications
| Parameter | Value |
|---|---|
| Probe 1 Frequency Range | 30 MHz to 1 GHz |
| Probe 1 Maximum RF Input Power | 0.5 W |
| Probe 1 Output Impedance | 50 ohms (nominal) |
| Probe 1 Output Connector | SMA (female) |
| Probe 1 Calibration | Individually calibrated; calibration data plotted on probe body |
11941A Specifications
| Parameter | Value |
|---|---|
| Probe 2 Frequency Range | 9 kHz to 30 MHz |
| Probe 2 Maximum RF Input Power | 0.5 W |
| Probe 2 Output Impedance | 50 ohms (nominal) |
| Probe 2 Output Connector | SMA (female) |
| Probe 2 Calibration | Individually calibrated; calibration data plotted on probe body |
Design & Construction
| Parameter | Value |
|---|---|
| Probe Sensor Design | Dual-loop shielded H-field (magnetic field) sensor |
| E-Field Rejection | Typically > 30 dB |
Calibration
| Parameter | Value |
|---|---|
| Calibration Traceability | Traceable to US National Institute of Standards and Technology (NIST) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +75 °C |
Option E51 Preamplifier
| Parameter | Value |
|---|---|
| Option E51 Preamplifier Gain | 30 dB |
| Option E51 Preamplifier Frequency Range | 9 kHz to 1 GHz |
| Option E51 Preamplifier Part Number | 11945-60001 |
| Option E51 Preamplifier Gain Flatness | ±1.5 dB |
| Option E51 Preamplifier Noise Figure | < 7 dB |
| Option E51 Preamplifier Input Connector | BNC female |
| Option E51 Preamplifier Output Connector | BNC female |
| Option E51 Preamplifier Input Impedance | 50 Ω nominal |
| Option E51 Preamplifier Output Impedance | 50 Ω nominal |
| Option E51 Preamplifier DC Power Requirement | 15 Vdc, 120 mA |
Option E51 Power Supply
| Parameter | Value |
|---|---|
| Option E51 Power Supply Input Voltage | 115 V AC / 230 V AC (option dependent, ±10%, 50/60 Hz) |
Probe 1 (11940A)
| Parameter | Value |
|---|---|
| Probe 1 Length | 205 mm (8.1 in) |
| Probe 1 Tip Width | 19 mm (0.75 in) |
| Probe 1 Tip Thickness | 11 mm (0.43 in) |
| Probe 1 Maximum Safe Magnetic Field | 0.2 A/m |
| Probe 1 Calibration Accuracy | ±2 dB (in a 50 Ω system) |
Probe 2 (11941A)
| Parameter | Value |
|---|---|
| Probe 2 Length | 205 mm (8.1 in) |
| Probe 2 Tip Width | 19 mm (0.75 in) |
| Probe 2 Tip Thickness | 11 mm (0.43 in) |
| Probe 2 Maximum Safe Magnetic Field | 15 A/m (9 kHz to 100 kHz), 1.6 A/m (100 kHz to 30 MHz) |
| Probe 2 Calibration Accuracy | ±2 dB (in a 50 Ω system) |
Technology
EMC Near-Field Probing
Applications
Electromagnetic Interference (EMI) Diagnostics and Troubleshooting