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頻率響應分析儀

SFRA45 - 變壓器掃描頻率響應分析儀

PSM1700 - 高精度100Vpk輸入

PSM1735 - 高精度0.01dB 35MHz

PSM3750 - 高精度50MHz帶寬

基本精度0.02dB 0.02dB 0.01dB 0.01dB
相位精度0.025°0.02°0.02°0.05°
頻率范圍5Hz?45MHz 10uHz?1MHz 10uHz?35MHz 10uHz?50MHz
什么是頻率響應分析儀？

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頻率響應分析儀（FRA）是一種高精度測量儀器，用于分析頻域中的元件，電路和系統(tǒng)（稱為待測設備或DUT）。 FRA通常產(chǎn)生正弦信號并將其注入到被測設備，電路或系統(tǒng)中。信號在FRA處測量，通常是通道1.注入信號同時通過設備。通常是系統(tǒng)的輸出，使用通道2.要確定的系統(tǒng)的頻域特性（頻率響應）。

量熱儀室用于高頻功率分析儀校準
頻率響應分析儀連接到DUT

FRA連接到DUT，信號發(fā)生器和參考通道（CH1）連接到DUT的輸入端，CH2連接到DUT的輸出端。

此連接方法可確定DUT的頻域特性（也稱為頻率響應）。 DUT對特定頻率范圍的響應可以通過執(zhí)行“掃描”來確定，該“掃描”涉及在由用戶預先選擇的頻率范圍內(nèi)跨越注入的頻率。

頻率響應分析器框圖

一旦測試信號到達頻率響應分析儀的輸入端，它們就會通過N4L專有電路進行信號調(diào)理，然后通過高線性ADC進行數(shù)字化。

數(shù)字化后，數(shù)據(jù)被傳送到FPGA / DSP進行離散傅立葉分析。

DFT充當“陷波濾波器”以僅提取注入的信號頻率。

例如，如果FRA發(fā)生器將1kHz信號注入電路，則頻率響應分析儀將利用DFT過程僅從傳送至FPGA的信號中提取1kHz分量。

沒有DFT過程，信號將被頻率響應數(shù)字化。 DFT工藝提供了出色的選擇性和非常高的（120dB）動態(tài)范圍。

比較來自CH1和CH2的DFT的輸出，關于幅度和相移兩者。增益（CH2 / CH1）轉(zhuǎn)換為dB值，同時顯示dB增益和相位偏移。

頻率響應分析器框圖
我如何使用頻率分析儀進行我的開發(fā)工作？

對于任何硬件工程師來說，頻率響應分析儀都應該被認為是重要的。重要的是要記住，N4L FRA是精密儀器，具有校準輸入和精確度，通常只在度量衡中才能看到。

確定是否要確定晶體管的AC信號行為或子系統(tǒng)。這些只有幾千個應用程序。

應用示例

control_loop晶體管濾波器音頻光電同軸電纜LDO變壓器cross_talk EMI
控制回路

穩(wěn)定性

分析

晶體管

性能

分析

濾波器設計

音頻放大器

設計

光耦合器

評測

同軸電纜

頻率

響應

LDO調(diào)節(jié)器

評測

信號變壓器

性能

評測

相聲

測試

RFI / EMC濾波器

設計

寬帶寬頻率響應分析儀結(jié)合多功能測量

在來自多個不同應用領域的工程師的世界中，PSM系列始終提供 的性能和靈活性與這種靈活的儀器相關聯(lián)。 Newtons4使用創(chuàng)新的現(xiàn)代技術和*的電路設計來實現(xiàn)高精度，而無需過多的成本。

儀器的PSM范圍不僅提供傳統(tǒng)的頻率響應測量，而且還可以與阻抗分析接口相結(jié)合

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5. Frequency Response Analyzers

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

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• 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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