At present, the wireless communication products based on the radio frequency principle are on the rise, and the number of them is growing at an alarming rate. From cell phones and wireless PDAs to WiFi-enabled laptops, Bluetooth headsets, RF identity tags, wireless medical devices and Zigbee sensors, the market for RF devices is expanding rapidly. To conduct comprehensive production testing and increase test throughput, test engineers must understand the most appropriate instrument to perform these tests. So how do you choose an RF test instrument? First, the choice of RF signal source All RF sources produce a continuous (CW) RF sine wave signal. Some signal generators can also generate analog modulated RF signals (such as AM signals or pulsed RF signals), and vector signal generators use IQ modulators to generate various analog or digitally modulated signals. The RF signal source can be further divided into a variety of, including a fixed frequency CW sine wave output source, a sweep output source of a frequency band non-fixed frequency CW sine wave, an analog signal generator, and a vector signal generator that adds analog and digital modulation functions. If the test requires an excitation signal, then an RF signal source is required. Key indicators of RF signal sources are frequency and amplitude range, amplitude accuracy, and modulation quality (for sources that produce modulated signals). Frequency tuning speed and amplitude settling time are also critical to reducing test time. A vector signal generator is a high-performance signal source that is typically combined with an arbitrary waveform generator to produce certain modulated signals. The arbitrary signal generator allows the vector signal generator to generate any type of analog or digitally modulated signal. This generator can generate multiple baseband waveforms internally, and in some cases, it can also generate some baseband waveform externally and load it into the instrument. If the test specification requires that the component, device, or system under test be tested in accordance with the processing modulation used in the final use of the device under test, then a vector signal generator is typically required in this case. If the test specification requires receiver sensitivity testing, bit error rate testing, adjacent channel rejection, two-tone intermodulation suppression, or two-tone intermodulation distortion testing, then an RF signal source is also required. Two-tone intermodulation testing and adjacent channel rejection testing require two sources, and receiver sensitivity testing and/or bit error rate testing requires only one RF signal source. If the device under test is for a mobile phone, the tester may have to test the type of modulated signal as required by the mobile phone standard. Mobile phone power amplifiers need to be tested in conjunction with a modulated signal source, such as a vector signal generator. Before selecting a vector signal generator, evaluate the speed at which the signal generator switches between different modulated signals to ensure that it provides the fastest test time. Second, the RF power meter - digital multimeter in the field of radio frequency Power is one of the most frequently measured quantities in the RF field. The easiest way to measure power is to use a power meter, which is actually used to measure the power of the RF signal. A wideband detector is used in the power meter to display the absolute power in watts, dBm, or dBμV. For most power meters, the wideband detector (or sensor) is a radio frequency Schottky diode or diode network that performs RF to DC conversion processing. The power meter is the most accurate of all RF instruments that measure power. High-end power meters (usually requiring an external power sensor) can achieve measurement accuracy of 0.1 dB or higher. The power meter can measure a minimum of -70dBm (100pW) of power. Sensors come in a variety of models, from high-power models, high-frequency (40GHz) models, to high-bandwidth models for peak power measurements. Power meters are available in single and dual channels. Each channel needs to be configured with its own sensor. A two-channel power meter measures the input and output power of a device, circuit, or system and calculates gain or loss. Some power meters are capable of measuring speeds of 200 to 1500 readings per second. Some power meters are capable of measuring the peak power characteristics of a variety of signals, including communication and modulated signals and pulsed RF signals used in certain applications. The dual channel power meter also accurately measures the relative power. The power meter can also be designed into a compact form factor for the needs of portable applications, making it more suitable for field testing needs. The main limitation of the power meter is its amplitude measurement range. The frequency range is a compromise between the measurement range and the measurement range. In addition, although the power meter can measure power very accurately, it cannot represent the frequency component of the signal. Third, the RF spectrum or RF signal analyzer - the oscilloscope of the RF engineer The spectrum or vector signal analyzer uses narrowband detection techniques to measure RF signals in the frequency domain. Its main output display is the relationship between power spectrum and frequency, including absolute power and relative power. This analyzer can also output demodulated signals. Spectrum analyzers and vector signal analyzers do not have the same accuracy as power meters, but the narrowband detection technology used in RF analyzers enables them to measure power as low as -150dBm. The accuracy of the RF analyzer is generally above ±0.5dB. Spectrum and vector signal analyzers can measure signal frequencies from 1 kHz to 40 GHz (or even above). The wider the frequency range, the greater the cost of the analyzer. The most common analyzers have frequencies up to 3 GHz. New communication standards operating in the 5.8 GHz frequency range require analyzers with bandwidths above 6 GHz. A vector signal analyzer is a spectrum analyzer that adds signal processing. It not only measures the amplitude of the signal, but also decomposes the signal into its in-phase and quadrature components. Vector signal analyzers can demodulate certain modulated signals, such as those produced by mobile phones, wireless LAN devices, and devices based on other new communication standards. The vector signal analyzer can display constellation, code domain maps, and computational metrics of modulation quality (eg, error vector magnitude). A conventional spectrum analyzer is a scan-tuned device in which a local oscillator is scanned for a range of frequencies, and a narrowband filter can acquire power components at each unit frequency in the frequency range. Vector signal analyzers also scan a portion of the spectrum, but they capture data within a certain wideband for fast Fourier transform to obtain power components at unit frequency. Therefore, the vector signal analyzer scans the spectrum much faster than the spectrum analyzer. Circular Box,Conduit Pipe Fittings,Coupling Pipe Fitting,Electrical Pvc Pipe Fittings FOSHAN SHUNDE LANGLI HARDWARE ELECTRICAL CO.LTD , https://www.langliplastic.com