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Types and uses of commonly used radio frequency and microwave measuring instruments

Views:8     Author:R&S     Publish Time: 2021-06-18      Origin:Internet

Wireless Comprehensive Tester


The wireless comprehensive tester is a radio frequency and protocol performance test equipment for mobile communication terminals. It has the following test functions:


Mobile RF performance and throughput test

Vehicle eCall and ERA-GLONASS system testing

VoLTE and VoWLAN voice test

Mobile A-GNSS test

POLQA and PESQ voice quality test

IP multimedia service test

Video performance test

IP connection security test

Wireless Comprehensive Tester



Signal and spectrum analyzer


Signal and spectrum analyzers are instruments and equipment for spectrum analysis and demodulation analysis of input signals. There are the following types:

Professional top-level spectrum analyzer, but also top-level ultra-wideband broadband signal analyzer, with the best performance indicators

General-purpose spectrum analyzer, also a general-purpose signal analyzer

Economical spectrum analyzer, usually with basic spectrum analysis function

Handheld spectrum analyzer, suitable for field test

The basic function of the spectrum analyzer is spectrum analysis, which depicts the power spectrum of the signal in the frequency domain. Another important function is the I/Q vector analysis of signal modulation. The top-level spectrum analyzer has the following functions:

The frequency range of the high-end spectrum analyzer host is DC~90GHz, which can be extended by external mixing for millimeter wave/THz testing

Spectrum test

Harmonic spurious test

Signal level statistical test

Channel power/adjacent channel power test

Noise power test

Intermodulation test

Real-time spectrum analysis

Radar signal analysis

I/Q signal analysis

Analog modem analysis

Digital/vector signal demodulation analysis

Group delay measurement

Power amplifier measurement analysis (distortion, frequency response, group delay)

Noise power ratio NPR measurement

Phase noise measurement

EMI test

Frequency hopping/transient analysis

Bit error rate test

2G/3G/4G/5G all standard communication signal analysis

Aviation navigation signal analysis

In this category of instruments, there are some special instruments for specific test items:

Measurement receiver: a measurement-grade instrument, specially used to measure signal sources or attenuators; built-in integrated power meter, receiver, audio analyzer, modulation analyzer and frequency meter, and optional spectrum analyzer and phase noise analyzer.


Phase noise analyzer and VCO tester: high-sensitivity phase noise measurement instrument and VCO characteristic tester; in the signal phase noise measurement, vector demodulation method or PLL method is adopted, and cross-correlation is optional, which has the highest sensitivity and far Better than the phase noise measurement sensitivity of the spectrum analyzer; built-in multiple DC power supplies, provide VCO power and tuning voltage, and automatically test various characteristic parameters of the VCO.

Signal and spectrum analyzer



EMI receiver


The EMI receiver is a special receiver for electromagnetic compatibility interference test standards. Its main purpose is to measure and evaluate the interference emission degree of the device under test according to the electromagnetic compatibility standard.


Types of EMI receivers:


Certified top EMI receiver, indicators far exceed the requirements of various EMC standards

Certified general EMI receiver, the index meets the requirements of military and civil EMC standards

Pre-certified EMI receiver, the indicators basically meet the requirements of military and civil EMC standards, usually pulses with repetition frequencies below 10Hz do not meet the requirements of civil standards

EMI receiver



Network Analyzer


The "network" of network analysis refers to radio frequency circuits and radio frequency signal channels, including radio frequency and microwave circuits, composed of signal channels and components, including various circuit components, and should not be confused with IT networks and power networks.

The basic function is circuit parameter analysis, analysis of S parameters (scattering parameters), analysis of signal (electromagnetic wave) transmission and reflection parameters in the network, commonly used parameter formats: amplitude (loss, gain, standing wave...), phase, delay, impedance .

Network analyzers are divided into two types: vector and scalar. Vector-network parameters that contain all information such as amplitude and phase, and scalar-does not contain information such as phase and delay.

Features of high-end vector network analyzer:

High-precision vector S-parameter measurement (gain, insertion loss, standing wave, phase, delay...)

Optional spectrum analyzer optional built-in spectrum analyzer function

Time domain measurement

Frequency conversion vector measurement

Coherent signal generation and adjustment

Variable frequency group delay test

Antenna test

Built-in pulse source and modulator for pulse test

True differential test

Noise figure measurement

De-embedding calibration

External control expansion module for THz measurement

Network Analyzer



Oscilloscope


An oscilloscope is a device that analyzes signal waveforms in the time domain. ADC level resolution and test bandwidth are the main parameters that distinguish the grade level of the oscilloscope.


Professional top oscilloscope: the maximum bandwidth exceeds 6GHz

Professional oscilloscope: maximum bandwidth up to 6GHz

General purpose oscilloscope: maximum bandwidth up to 1GHz

Economical oscilloscope: bandwidth < 500MHz

Handheld oscilloscope

Its application range is very wide:

Signal waveform analysis

Signal integrity analysis

Multi-channel amplitude and phase measurement

Multi-channel FFT spectrum analysis

Bus protocol analysis

Jitter analysis

Time domain reflectance TDR measurement

Oscilloscope



Signal generator


A signal generator is also called a signal source, which is an instrument and equipment that generates radio frequency microwave signals and various modulated signals.



Analog signal source: can generate analog modulation signal

Modulation: AM/FM/PM and pulse modulation

Top microwave analog source: ultra-low phase noise and noise

Universal analog source


Vector signal source: can generate vector and digital modulation signals

Top microwave vector source

Frequency up to 44GHz, modulation bandwidth up to 2GHz

Ultra low phase noise

Various types of mobile communication signals that can generate 3Gpp specifications

Generate and simulate GNSS navigation

Can fading and noise simulation

Generate and simulate radars and targets

Generate and configure MIMO signals

Universal vector source

Frequency up to 6GHz, modulation bandwidth up to 500MHz

Economical vector source

Frequency up to 7.5GHz, modulation bandwidth up to 240MHz

Signal generator



Power meter


The power meter is the standard equipment for radio frequency signal power measurement. The power meter cannot distinguish the signal frequency and measure the total power within the working bandwidth.


The core equipment of the power meter is a power sensor, also called a power probe or a power base. Modern power sensors are integrated with measurement and data processing devices. The host of the power meter is not necessary. It can be directly connected to computers, mobile phones, instruments, etc. to complete power measurement .


Power sensor classification:


The pyroelectric sensor has the highest accuracy, the frequency range can reach 110GHz, and the dynamic range is low, usually -50~+20dBm

General sensor, usually multi-channel diode technology, frequency range up to 67GHz, high dynamic range, usually -70~+20dBm

Broadband sensor, usually used to measure the peak value and average power of narrow pulse signals, as well as pulse width, rising and falling edge time and period, etc.

dynamometer



Low frequency measuring instrument


Multi-function tester:

Measurement: voltage, current, resistance, capacitance

LCR tester

Impedance measurement: resistance, capacitance, inductance

Low frequency measuring instrument



DC power supply


Function of DC power supply:


The basic function is to provide a stable and pure DC power supply

Set voltage source or current source

Power analysis measurement function, monitor output voltage and current

High-speed analysis, acquisition and recording of output voltage, current, and power changes

Output voltage waveform editing

Load change fast recovery function

Pulse power setting

Performance of DC power supply:

Power output ripple and noise

Output voltage range and power range

DC power supply

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