用户手册 RIGOL
NFP-3 近场探头
产品简介
NFP-3 用于配合 RIGOL DSA 系列频谱分析仪进行电子产品的 EMI 测试，可用来检测元器
件表面的磁场强度、磁场耦合通道以及电子模块附近的磁场环境，从而快速定位干扰源。
NFP-3 包含四个型号 NFP-3-P1、NFP-3-P2、NFP-3-P3 和 NFP-3-P4。
测量连接
NFP-3 与频谱分析仪的连接方式如下图所示。
频谱分析仪
N-BNC 转接器
BNC-SMB 射频线缆
NFP-3
被测设备
用户手册 RIGOL
― 与频谱分析仪连接
使用 BNC-SMB 射频线缆分别连接 NFP-3 的 SMB（阳）头和 N-BNC 转接器的 BNC（阴）
头，再将 N-BNC 转接器的 N（阳）头连接至频谱分析仪的射频输入端。
― 与被测设备连接
NFP-3 与被测设备近距离非接触式测量。测量时，请注意近场探头的摆放方向。
典型应用
― EMI 辐射干扰源定位。
― 确定干扰源频谱分量的频率及相对强度。
性能指标
频率
频率范围 30 MHz 至 3 GHz
端口类型
端口形式 SMB（阳）型
转接器 N（阳）-BNC（阴）型
射频线缆 BNC（阳）-SMB（阴）型，1000 mm
端口及转接器阻抗
一般技术规格
尺寸 260 mm × 190 mm × 30 mm（带外包装）
重量 0.425 kg（带外包装）
工作温度 0℃至 50℃
存储温度 -20℃至 70℃
50 Ω
2015 年 8 月
2015 年 8 月
用户手册 RIGOL
用户手册 RIGOL
型号 说明
NFP-3-P1
磁场近场探头，可探测范围 10 cm 以内。用于定位检测泄漏的磁场。
NFP-3-P2
磁场近场探头，可探测范围 3 cm 以内。用于精确检测泄漏的磁场。
型号 说明
NFP-3-P3
磁场近场探头，分辨率约 5 mm。用于电缆电磁泄漏的测试。
NFP-3-P4
磁场近场探头，分辨率约 2 mm。可检测垂直方向上的磁场；用于
PCB 布线产生的电磁场测试。
2015 年 8 月
2015 年 8 月
User's Guide RIGOL
NFP-3 Near Field Probe
Product Overview
NFP-3 is used with RIGOL DSA series spectrum analyzer for the EMI tests of electronic
products. It can be used to test the magnetic field strength and magnetic field coupling
channels on the surface of the electronic components as well as the magnetic field
environment near the electronic module so as to quickly locate the interference source.
NFP-3 includes four models (NFP-3-P1, NFP-3-P2, NFP-3-P3 and NFP-3-P4).
Measurement Connections
The connection mode of NFP-3 and spectrum analyzer is as shown in the figure below.
Spectrum Analyzer
N-BNC Adaptor
BNC-SMB RF Cable
NFP-3
Device under Test
User's Guide RIGOL
― Connect the spectrum analyzer
Connect the SMB (M) terminal of NFP-3 and the BNC (F) terminal of the N-BNC
adaptor respectively via the BNC-SMB RF cable; connect the N (M) terminal of the
N-BNC adaptor to the RF input terminal of the spectrum analyzer.
― Connect the device under test
NFP-3 is used to perform short-distance noncontact measurement on the device
under test. Pay attention to the direction of the probe during measuring.
Typical Applications
― Locate the EMI radiation interference source.
― Determine the frequency and relative strength of the spectral component of the
interference source.
Performance Specifications
Frequency
Frequency Range 30 MHz to 3 GHz
Terminal Type
Term i na l Ty pe SM B ( M)
Adaptor N (M)-BNC (F)
RF Cable BNC (M)-SMB (F), 1000 mm
Terminal and Adaptor Impedance 50 Ω
General Specifications
Dimensions 260 mm × 190 mm × 30 mm (with package)
Weight 0.425 kg (with package)
Operating Temperature
Storage Temperature
0℃ to 50℃
-20℃ to 70℃
Aug. 2015
Aug. 2015
User's Guide RIGOL
User's Guide RIGOL
Model Description
NFP-3-P1
Near field probe for magnetic field measurements. The test range
is within 10 cm. It is used to locate the leakage field.
NFP-3-P2
Near field probe for magnetic field measurements. The test range
is within 3 cm. It is used to accurately test the leakage field.
Model Description
NFP-3-P3
Near field probe for magnetic field measurements. The resolution
is about 5 mm. It is used to test the electromagnetic leakage of
the cables.
NFP-3-P4
Near field probe for magnetic field measurements. The resolution
is about 2 mm. It can test the magnetic field in the vertical
direction and the electromagnetic field generated by the PCB
wiring.
Aug. 2015
Aug. 2015
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