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High Frequency Magnetic Field Probes (30MHz to 3GHz)
The HNFP series of near-field probes cover the 9KHz to 3GHz frequency range and are ideal for use in the development of cost-effective EMI troubleshooting solutions, which can be employed to address a wide range of EMI problems. The product comprises seven probes designed to test magnetic fields (H) and two high-frequency probes designed to test electric fields (E). The magnetic field probes feature special electrically isolated probe heads with varying head shapes, offering versatility for near-field measurement tasks. All near-field probes are passive and are connected directly to a spectrometer or oscilloscope via a 50Ω cable, allowing for real-time magnetic field testing and analysis. In situations where the interference signal is weak, our 30dB gain pre-RF amplifier (HNFPA-1) can enhance the system test sensitivity. Facilitate the identification and resolution of potential EMI/EMC issues prior to product release for conformance testing.
  • HNFP series of high-frequency magnetic field probe set contains four specifically designed to test the high-frequency magnetic field (H) probe, which is effectively shielded from electric field interference (E);
  • HNFP series of low-frequency magnetic field probe set contains three specifically designed to test the low-frequency magnetic field (H) probe, which is effectively shielded from electric field interference (E);
  • HNFP series of high-frequency electric field probe set contains two specifically designed to test the high-frequency of the electric field (E) probes, which are near-field probes mainly applied to find the source of E-field interference;
  • High-frequency magnetic field probes frequency range: 30MHz-3GHz; Low-frequency magnetic field probes frequency range: 9kHz-50MHz;
  • High-frequency E-field probes frequency range: 30MHz-3GHz;
  • HNFPA-1 preamplifiers frequency range: 9kHz-3GHz, with a gain of approx. 30dB;
  • All near-field All near-field probes are passive and can be plugged into the input port of an oscilloscope, receiver or spectrum analyzer;
  • Large loops are more sensitive but have lower spatial resolution, while small loops are less sensitive but make it easier to narrow down the location of the source;
  • Magnetic-field probes contain special electrically isolated probe heads, with different head shapes to suit different near-field measurement tasks;
  • All near-field probes are easy to use and help engineers to find electromagnetic compatibility problems quickly and effectively, making them ideal tools for testing electromagnetic fields.

Measurement connections

Connection to the device under test

The HNFP series near-field probes are used for non-contact measurements in close proximity to the device under test. When measuring, please pay attention to the direction of placement of the near-field probe.


Product characteristics


Model

Summarize

CharacteristicCurve

 

 

HNFP-1

Magnetic field near-field probe.

Detects magnetic fields within 10cm.

Frequency range: 30MHz to 3 GHz.

Resolution: 25mm or so.

 

 

 

 

 

HNFP-2

Magnetic field near-field probe that

Checks magnetic fields within 3 cm.

Frequency range: 30MHz to 3 GHz.

Resolution: around 10mm.

 

 

 

HNFP-3

Magnetic field near-field probes, mainly used for electromagnetic leakage testing of cables.

Frequency range: 30MHz to 2 GHz.

Resolution: around 5mm.

 

 

HNFP-4

Magnetic field near-field probe that detects electromagnetic fields emitted in a vertical direction.

Frequency range: 30MHz to 3 GHz

Resolution: around 2mm



High Frequency Magnetic Field Set Model Frequency Ranges Resolution Application Notes
HNFP-1 High-frequency magnetic near-field probes Frequency range: 30MHz-3GHz 25mm or so Magnetic field can be checked in the range of 10cm, mainly used for chassis leakage test.
HNFP-2 High-frequency magnetic near-field probes Frequency range: 30MHz-3GHz 10mm or so Magnetic fields within 3cm can be checked.
HNFP-3 High-frequency magnetic near-field probes Frequency range: 30MHz-2GHz 5mm or so Mainly used for electromagnetic leakage testing of cables.
HNFP-4 High-frequency magnetic near-field probes Frequency range: 30MHz-3GHz 2mm or so Detects electromagnetic fields emitted in the vertical direction, mainly used for electromagnetic field testing generated by PCB wiring.
Low Frequency Magnetic Field Set Model Frequency Ranges Resolution Application Notes
HNFP-5 Low frequency magnetic near-field probes Frequency range: 1MHz-50MHz 25mm or so Can detect the magnetic field within 10cm, mainly used for low-frequency conduction rectification test.
HNFP-6 Low frequency magnetic near-field probes Frequency range: 1MHz-50MHz 10mm or so Detect the magnetic field within 3cm, mainly used for low-frequency conduction rectification test.
HNFP-7 Low frequency magnetic near-field probes Frequency range: 9KHz-1.5MHz 25mm or so Can detect the magnetic field within 10cm, mainly used for low-frequency conduction rectification test.
High Frequency Electric Field Set Model Frequency Ranges Resolution Application Notes
HNFP-8 Electric field near-field probes Frequency range: 30MHz-1.5GHz   For detection of surface electric fields, suitable for bus structures or large original areas.
HNFP-9 Electric field near-field probes Frequency range: 30MHz-3GHz   For the detection of electric fields generated on the surface of a single wire.
Radio Frequency Amplifier Model Frequency Ranges Resolution Application Notes
HNFPA-1 Preamplifier Frequency range: 9KHz-3GHz   30dB gain



Frequency

Frequency Ranges

Low Frequency: 9kHz to 50MHz High Frequency: 30MHz to 3GHz

Port Type

Port Format

SMB (male) type

Adapter (cable connector)

N (male) - SMA (female) type

Radio Frequency Cables

BNC (male) - SMB (female) type, 1m


Standard Accessories
Adaptor
SMA Female to N Male*2
RF cable
Approx. 1m in length, input port with near-field probe*1
Optional Accessories
HNFPA-1 RF Amplifier
Mainly amplifies the weak signals to be tested, with a gain of about 30 dB.