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频率响应分析仪

SFRA45 - 变压器扫描频率响应分析仪

PSM1700 - 高精度100Vpk输入

PSM1735 - 高精度0.01dB 35MHz

PSM3750 - 高精度50MHz带宽

基本精度0.02dB 0.02dB 0.01dB 0.01dB
相位精度0.025°0.02°0.02°0.05°
频率范围5Hz〜45MHz 10uHz〜1MHz 10uHz〜35MHz 10uHz〜50MHz
什么是频率响应分析仪？

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频率响应分析仪（FRA）是一种高精度测量仪器，用于分析频域中的元件，电路和系统（称为待测设备或DUT）。 FRA通常产生正弦信号并将其注入到被测设备，电路或系统中。信号在FRA处测量，通常是通道1.注入信号同时通过设备。通常是系统的输出，使用通道2.要确定的系统的频域特性（频率响应）。

量热仪室用于高频功率分析仪校准
频率响应分析仪连接到DUT

FRA连接到DUT，信号发生器和参考通道（CH1）连接到DUT的输入端，CH2连接到DUT的输出端。

此连接方法可确定DUT的频域特性（也称为频率响应）。 DUT对特定频率范围的响应可以通过执行“扫描”来确定，该“扫描”涉及在由用户预先选择的频率范围内跨越注入的频率。

频率响应分析器框图

一旦测试信号到达频率响应分析仪的输入端，它们就会通过N4L专有电路进行信号调理，然后通过高线性ADC进行数字化。

数字化后，数据被传送到FPGA / DSP进行离散傅立叶分析。

DFT充当“陷波滤波器”以仅提取注入的信号频率。

例如，如果FRA发生器将1kHz信号注入电路，则频率响应分析仪将利用DFT过程仅从传送至FPGA的信号中提取1kHz分量。

没有DFT过程，信号将被频率响应数字化。 DFT工艺提供了出色的选择性和非常高的（120dB）动态范围。

比较来自CH1和CH2的DFT的输出，关于幅度和相移两者。增益（CH2 / CH1）转换为dB值，同时显示dB增益和相位偏移。

频率响应分析器框图
我如何使用频率分析仪进行我的开发工作？

对于任何硬件工程师来说，频率响应分析仪都应该被认为是重要的。重要的是要记住，N4L FRA是精密仪器，具有校准输入和精确度，通常只在度量衡中才能看到。

确定是否要确定晶体管的AC信号行为或子系统。这些只有几千个应用程序。

应用示例

control_loop晶体管滤波器音频光电同轴电缆LDO变压器cross_talk EMI
控制回路

稳定性

分析

晶体管

性能

分析

滤波器设计

音频放大器

设计

光耦合器

评测

同轴电缆

频率

响应

LDO调节器

评测

信号变压器

性能

评测

相声

测试

RFI / EMC滤波器

设计

宽带宽频率响应分析仪结合多功能测量

在来自多个不同应用领域的工程师的世界中，PSM系列始终提供 的性能和灵活性与这种灵活的仪器相关联。 Newtons4使用创新的现代技术和*的电路设计来实现高精度，而无需过多的成本。

仪器的PSM范围不仅提供传统的频率响应测量，而且还可以与阻抗分析接口相结合

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Frequency Response Analyzers

What is a Frequency Response Analyzer?

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A Frequency Response Analyzer (FRA) is a high precision measurement instrument used to analyze components, circuits and systems (known as devices under test, or DUT’s) in the frequency domain. An FRA typically generates a sinusoidal signal and injects it  into a component, circuit or system under test. This signal is measured at the point of injection using one of the input channels on the FRA, usually channel 1. The injection signal travels through the device under test and the same signal is measured simultaneously by the frequency response analyzer at a second reference point – normally the output of the system, using channel 2. The use of sinewaves allows the frequency domain behavior (the frequency response) of a system to be determined.

Frequency Response Analyzer connection to DUT

The diagram on the left illustrates a basic overview for connecting an FRA to a DUT, the signal generator and reference channel (CH1) are connected to the input of the DUT, CH2 is connected to the output of the DUT.

This connection method enables the frequency domain behavior (also known as the frequency response) of the DUT to be determined. The response of the DUT over a specific frequency range can be determined by performing a “sweep”, this involves stepping the injected frequency across a range of frequencies pre-selected by the user.

Frequency Response Analyzer block diagram

Once the test signals reach the inputs of the frequency response analyzer, they are signal conditioned with N4L proprietary ranging circuitry and then digitized via a high linearity ADC.

After digitization, the data is passed to the FPGA/DSP for discrete fourier analysis.

The DFT acts as a “notch filter” to extract only the injected signal frequency, all other frequencies are rejected.

For example, if a 1kHz signal is injected into the circuit by the FRA generator, the frequency response analyzer utilizes the  DFT process to extract the 1kHz component only from the signal passed to the FPGA.

Without the DFT process, the signal digitized by the frequency response analyzer would also contain noise. The DFT process provides excellent selectivity and very high (120dB) dynamic range.

The output of the DFT from both CH1 and CH2 are compared, with respect to both magnitude and phase shift. The absolute gain (CH2/CH1) is converted into a dB value and both dB gain and phase shift in degrees are displayed.

How can I use a Frequency Analyzer for my development work?

A frequency response analyzer should be considered as important as an oscilloscope to any hardware engineer, it is a primary design tool that would play an important role on any hardware engineers test bench. It is important to remember that N4L FRA’s are precision instruments, featuring calibrated inputs and offering measurement accuracies usually only seen within metrology.

An FRA can be used to characterize the gain/phase response of an input filter circuit, determine the AC signal behavior of a transistor, determine whether or not a servo motor control system is stable, enable an engineer to determine the transfer function of a device or subsystem. These are only a few of the many thousands of applications a frequency response analyzer can be applied to.

Example Applications

Control Loop Stability Analysis	Transistor Performance Analysis	Filter Design	Audio Amplifier Design	OptoCoupler Evaluation	Coax Cable Frequency Response	LDO Regulator Evaluation	Signal Transformer Performance Evaluation	Cross Talk Testing	RFI/EMC Filter Design

Wide bandwidth Frequency Response Analyzers Combined with Multi Function Measurement

In a world where engineers from many different application areas require ever increasing speed, flexibility and measurement accuracy, the PSM range is a new generation of versatile frequency response analyzers that offer leading performance in every mode without the compromise on accuracy or the additional cost that is commonly associated with such flexible instruments. Newtons4th utilise innovative modern technology and unique circuit design in our instruments to achieve such high accuracy without excessive cost.

The PSM range of instrumentation provide not just conventional frequency response measurements but can also be combined with an Impedance Analysis Interface to form a high accuracy impedance analyser, in the case of the PSM3750 this solution is able to provide impedance analysis up to 50MHz

Additional features include an oscilloscope function (PSM3750 + SFRA45) as well as Power Analyzer, Harmonic Analyzer and Vector Voltmeter modes.

Comparison table of complete Frequency Response Analyzer Range

 Standard         Option         Not Available

	SFRA45 - Transformer Sweep Frequency Response Analyzer	PSM1700 - High Accuracy 100Vpk Input	PSM1735 – High Accuracy 0.01dB 35MHz	PSM3750 - High Accuracy 50MHz Bandwidth
Basic Accuracy	0.02dB	0.02dB	0.01dB	0.01dB
Phase Accuracy	0.025°	0.02°	0.02°	0.05°
Frequency Range	5Hz ~ 45MHz	10uHz ~ 1MHz	10uHz ~ 35MHz	10uHz ~ 50MHz
Measurement	Real Time DFT	Real Time DFT	Real Time DFT	Real Time DFT
IAI Impedance Analysis Option Available
IAI Impedance Analysis Basic Accuracy		0.1%	0.1%	0.1%
LCR Active Head Option Available
LCR Active Head Accuracy		0.2%	0.2%
No. of Channels	2	2	2	2 or 3
True RMS Voltmeter
Oscilloscope
Isolated Generator
Isolated Inputs
Harmonic Analyzer
Power Analyzer
Input Max Voltage	10Vpk	100Vpk	10Vpk	500Vpk
No. of Ranges	9	9	9	16
USB Memory Port
LAN Port
GPIB Port
RS232 Port
Real Time Clock
19in Rack Mount Option
Internal Memory	1000 Records	8000 Records	8000 Records	16000 Records
Dimensions Excl. Feet (HxD mm)	305 x 230 x 45	170 x 350 x 250	170 x 350 x 250	92 x 215 x 312
Weight (Instrument)	2.7kg	4kg	4kg	3.3 - 3.5kg

Products in this series

• PSM1700 Frequency Response Analyzer

  PSM1700 Frequency Response Analyzer – Gain/Phase analysis of SMPS Feedback Loops, Filter Analysis and LCR Measurement capabilities

   View Product Details

• IAI Impedance Analyzer

  IAI: 4 wire Kelvin connected impedance analysis with increased measurement range and accuracy at frequencies up to 35MHz

   View Product Details

• PSM1735 – 10uHz to 35MHz Frequency Response Analyzer

  The PSM1735 offers a bandwidth of 35Mhz, able to provide 0.01dB and 0.01° accuracy. The PSM1735 is perfect for sensitive frequency response measurements.

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• PSM3750 Frequency Response Analyzer: 10µHz–50MHz – High Performance

  PSM3750 – Frequency Response Analyzer: Offers FRA, VVM, RMS Voltmeter, Oscilloscope, Harmonic Analyzer, Power Meter

   View Product Details

• SFRA45 Sweep Frequency Response Analyzer

  The N4L SFRA45 is the perfect measurement solution for sweep frequency response analysis of power transformers. Providing fast, reliable repeatable measurements.

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• PSM2201 – Discontinued May 2013

  Veqtor: 10µHz–2.4MHz – Low Signal Level High accuracy Frequency response analyser has now been replaced by the PSM3750

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• PSM2200 – Discontinued May 2013

  QuanteQ: 10µHz–2.4MHz – High voltage isolated Frequency Response Analyser has now been replaced by the PSM3750

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• Kanggaote Science and Technology

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