9 kHz–3 GHz Near Field Probe is a device used to measure electromagnetic signals. It detects electromagnetic radiation in the frequency range from 9 kHz to 3 GHz and operates in close proximity to the measurement target. This type of probe is commonly used for testing in areas such as radio spectrum analysis, electromagnetic compatibility (EMC), and radio equipment evaluation. The working principle of the near-field probe is to measure signals by detecting the intensity of the electromagnetic field. It typically consists of a radio-frequency antenna and a receiver that converts received electromagnetic signals into electrical signals for analysis and measurement. These probes can be connected to specialized instruments or measurement equipment—such as spectrum analyzers or oscilloscopes—to obtain detailed data and graphical representations. When using a 9 kHz–3 GHz near-field probe, maintain a consistent and close distance between the probe and the device under test to ensure measurement accuracy. Additionally, minimize interference from other electromagnetic sources. Note: Slight variations in appearance, color, or printed markings may occur between batches; these do not affect functionality. Model: 9 kHz–3 GHz Near Field Probe Working Frequency Range: 9 kHz–3 GHz Connector: SMA Female How to Use the Near Field Probe: Required Equipment: Spectrum analyzer or receiver, preamplifier, and near-field probe. Setup Steps: 1. Set the frequency range and resolution bandwidth on the spectrum analyzer. Use a wide frequency span initially to assess overall emissions from the device under test. 2. Enter the preamplifier’s correction factor into the spectrum analyzer.