First, PCB board anti-interference performance measurement (EMS electromagnetic sensitivity)
The fundamental reason why an electronic product can pass the EFT (Electrical Fast Transient Burst) / ESD (Electrostatic Discharge) test is that transient, high voltage, and broadband interference currents caused by EFT/ESD pulses flow into the internal circuit module. The electromagnetic field generated by the interference current can interfere with the timing of the critical signal lines inside the product or affect the normal operation of the device. The conventional method cannot measure the current path of the interference current, and it is also difficult to confirm the affected signal line or device. The marine instrument's immunity test system and electromagnetic sensitivity compatibility tool are suitable for anti-interference analysis of component groups and PCB boards during the development process.
1. Immunity test system used in the development process
E1 anti-jamming development system: An EMC test tool system for anti-interference analysis during PCB board development, which can quickly and accurately locate the causes of pulse group interference and electrostatic discharge interference (weak points in the PCB), enabling developers to Accurately design appropriate EMC measures for weak points and use E1 to evaluate the effectiveness of EMC measures. The E1 system has a small construction space and is suitable for use in the work site of PCB board developers. It can be used to understand the basic working strategy of EMC working mechanism and PCB board de-interference. The E1 system includes a burst interference and electrostatic discharge disturbance generator, nine different electric and magnetic field sources, and various other accessories. Price ¥ 45,000 / set.
S2set fast transient pulsed magnetic field probe: Electronic devices and electronic components generate fast transient pulsed magnetic fields under interference. The S2 probe assembly contains active and passive magnetic field probes that can measure these fast transient pulsed magnetic fields without feedback. Analyze burst or ESD electrostatic discharges, as well as transients or ESD interference with the object being measured. Need to be used with the SGZ21 transient pulse generator. Price: ¥10,500 / set
2. Mini magnetic and electric field generators used in the development process
P23 built-in battery pulse electric field generator: The generated interference electric field pulse is injected into the digital input port of the integrated circuit under test through the top of the generator, such as reset, clock, crystal, or the corresponding signal line pin. The maximum voltage generated is 1.2kV. Price: ¥11600
P11t with externally triggered pulsed magnetic field generator: The tip of the burst field generator produces a disturbing magnetic field of approximately 3 mm in diameter. Through the TTL trigger input, the generator's interference magnetic field can be synchronized with the signal generated by the device under test or an external signal generator. Used to locate sensitive wire segments, components and component contacts. Price: ¥14050
3. Long-distance non-potential transmission optical signal transmission system
A000 Series Analog Signal Interference Transmitter: Displays analog signals under the influence of EFT/ESD/high frequency interference to the oscilloscope. The system is particularly suitable for detecting analog signals when detecting the immunity of electrical or electronic equipment to high frequency electromagnetic fields (IEC 61000-4-3 to IEC61000-4-6). A given modulation of the electromagnetic field affects the analog signal, and the A100, A200, and A300 series of analog signal jammers quickly recognize these effects. A sensor is included to measure the analog signal in the measured object, and the measured analog signal is converted into an optical signal; the optical signal is transmitted to the optical receiver through the optical fiber, and the receiver converts the optical signal into an electronic analog signal, and then transmits To the oscilloscope. The oscilloscope can display these signals or use them to control other devices. There are three types of six options:
A100-1set single channel analog fiber optic probe (25KHz), price: ¥7150
A100-2set dual channel analog fiber optic probe (25KHz), price: ¥11800
A200-1set single channel analog fiber optic probe (500KHz), price: ¥16200
A200-2set dual channel analog fiber optic probe (500KHz), price: ¥31,500
A300-1set single channel analog fiber optic probe (5MHz), price: ¥ 21500
A300-2set dual channel analog fiber optic probe (5MHz), price: ¥ 43,000
OSE000 Series Digital Signal Interference Transmitter: Displays digital signals under the influence of EFT/ESD/HF interference on an oscilloscope. A sensor is included to detect the logic signal and convert the logic signal into an optical signal; the optical signal is transmitted to the optical receiver through the optical fiber, and the receiver converts the optical signal into an electronic digital signal, which is then transmitted to the oscilloscope. The oscilloscope can display these signals. Suitable for signal monitoring in outdoor or electromagnetic compatibility spaces; it also optimizes the electromagnetic compatibility of hardware and software. There are three options:
OSE150-1set single channel digital fiber optic probe (50Mbps), price: ¥5850
OSE150-2set dual channel digital fiber optic probe (50Mbps), price: ¥11,500
OSE400set four-channel digital fiber optic probe (10Mbps), price: ¥10,500
100 Series Bus Signal Interference Transmitter: Interference signals can be propagated without potential according to the CAN / LIN bus standard. The CAN100 fiber optic probe fieldbus transmission system can transmit signals without potential according to the CAN standard. The LIN100 fiber optic probe fieldbus transmission system delivers signals without potential in accordance with the LIN standard. These probes are very small and can be placed directly on the component set when in use. The system is a two-layer fiber, so it has a bidirectional optical transmission line suitable for transmitting signals in electromagnetic compatibility (EMV) experiments. There are three options:
CAN100set CAN bus transmission kit (1Mbit/s), price: ¥8800
CAN100A01set CAN bus transmission kit (1Mbit/s), price: ¥2500
LIN100set LIN bus transmission kit (20Kbit/s), price: ¥8650
4, BD series burst burst detector: undisturbed measurement of the burst magnetic field in the cable
The burst detector can be connected to the oscilloscope via fiber optics and optical receivers. The pulse group detector is mounted on the cable or the conductor bundle to monitor the power line of the electronic device or the interference signal on the interconnected signal line. Once the interference value exceeds the threshold value, the detected interference signal is transmitted through the optical fiber and then received by the light. The converter (OE110) converts this signal into a TTL signal and records and displays the detected interference on a recorder, oscilloscope or counter. There are four options:
BD01B Magnetic Field Detector: Detects the pulse train or the magnetic pulse field during electrostatic discharge. Compact design for mounting on cables in tight spaces. Price: ¥770 yuan
BD01E electric field detector: The electric field when detecting a pulse group or ESD. It can be installed in the control cabinet, on the inter-module device, between the module and the chassis. Price: ¥770 yuan
BD06B passive magnetic field detector: detects the pulse field or the magnetic pulse field during electrostatic discharge. It is small in size and can be easily fixed to various types of cables with high sensitivity. Price: ¥700
BD11 magnetic field detector: The magnetic field of a pulse group or ESD current pulse. Built-in battery and memory, can be set to high sensitivity, the detected interference pulse can be displayed by LED, and can be connected through relay output or fiber. Price: ¥1950 yuan
Second, PCB board interference performance measurement (EMI electromagnetic irradiance)
The interference test system and electromagnetic radiation compatibility tool introduced by Ocean Instruments are suitable for interference emission measurement of component groups and PCB boards during the development process. Near-field interference measurements are especially useful for engineers who are developing components and equipment. They use near-field measurements to obtain important data that interferes with the cause of the launch. The information obtained by the near-field measurement method and the data can locate the interference source and take corresponding measures to reduce the electromagnetic interference. The original intention of near-field analysis is to obtain an ideal electric and magnetic field distribution, which is necessary and useful in electromagnetic compatibility testing.
1. Anti-interference radiation test system used in the development process
ESA1 Interference Radiation Detection System: Compares interference emissions from measurement component groups and equipment. For smooth and easy-to-understand interference, the system includes a set of CS-ESA software tailored to the R&D engineer's work. Particularly suitable for R&D personnel to test at the job site. During the development process, the measurement results of the interference emission using the ESA1 system are directly proportional to the far field measurement or the measurement results of the analog circuit network. Using the various tools in the ESA1 system, you can locate the source of the interference and discover the coupling or transmission path of the interfering radiation so that a reasonable electromagnetic compatibility scheme can be found and its size determined. The electric field compatibility improvement effect obtained by using the ESA1 system is proportional to the far field measurement effect of the board. The system includes CS-ESA chip scanning software, HFW21 RF current converter, HFA21 RF shunt, Z23-1 mobile shield, PA203 preamplifier (20dB), 8 3G RF magnetic field probes, 3 3G RF electric field probes . Price: ¥110,000
2, Z23-0set series mobile shielding canopy: consists of a tie rod connected to the awning and GP23 grounding plate. Used to shield the RF magnetic field outside the test unit or to protect test equipment such as ESD test. The shield can be easily opened and closed from the front, making it easy to operate the device under test at any time; it can also be turned backwards to make the operation more convenient. There are two options:
Z23-1set desktop shield canopy, size: 900x500x400mm, price: ¥26500
Z23-2set desktop shield canopy, size: 900x500x650mm, price: ¥28500
3. EMC-set0 Series EMI Pre-Test Test Kit: CISPR-compliant EMC EMC test with filters, software and preamplifiers that converts them into a variety of common measurement toolboxes in the field of pre-specification. The Marine Instrument EMC Test Suite provides a near-perfect EMI pre-certification test solution for analyzing typical EMC problems. The kit includes HMS-X spectrum interference receiver, three near-field probes with different functions, HM6050-2D artificial power network and EMC pre-accuracy HMExplorer software. There are two options:
EMC-set1 1G pre-test test kit, price: ¥54200
EMC-set2 3G pre-test test kit, price: ¥71,200
4. RF near-field probe for interference measurement: passive near-field probe with different frequency bands, different shapes and different functions. Five series, different structures, any combination, to diagnose electromagnetic interference of different devices and various frequency bands.
1) LF series passive magnetic field probe: 7 optional, frequency range: 100KHz ~ 50MHz, used to measure the RF magnetic field in the long wave, medium wave and short wave area on the electronic module in the research and development stage. Single price: each contains a carrying case, 1 meter SMB-BNC cable (72984), probe, LF-R400, LF-R50, LF-U5, LF-U2.5, LF-K7 probes each for ¥ 3900 yuan, LF-R3, LF-B3 magnetic field probe each is ¥ 5300 yuan. Kit price: LF1set four-piece set, including LF-R400, LF-B3, LF-U5, LF-U2.5 magnetic field probe, carrying case, 1 meter SMB-BNC cable, ¥11,800/set.
2) RF series passive near-field probes: 15 optional, frequency range: 30M ~ 3GHz, used for 3G RF interference emission measurement in the development process. Single price: each carrying case, 1 meter SMB-BNC cable (72984), probe, RF-R400-1, RF-R50-1, RF-R3-2, RF-B3-2, RF- U5-2, RF-U2.5-2, RF-K7-4 magnetic field probes and RF-E02, RF-E04, RF-E05, RF-E09, RF-E09S electric field probes each cost ¥3900, RF- The R0.3-3, RF-B0.3-3 magnetic field and RF-E10 electric field probes each cost ¥4,900. Kit price: RF1set four-piece set, including RF-R3-2, RF-U2.5-2, RF-K7-4 magnetic field probe and RF-E10 electric field probe, carrying case, 1 meter SMB-BNC cable, ¥13000 Yuan/set; RF2set four-piece set, including RF-R400-1/RF-R50-1/RF-B3-2/RF-U5-2 magnetic field probe, carrying case, SMB-BNC line, instead of the German N9311X-100 , ¥11,800 yuan / set. RF5set four-piece set, including RF-R400-1, RF-R3-2, RF-U2.5-2 magnetic field probe and RF-E05 electric field probe, carrying case, 1 meter SMB-BNC cable, ¥11,800/set ; RF6set four-piece set, including RF-R50-1, RF-B3-2, RF-U2.5-2 magnetic field probe and RF-E02 electric field probe, carrying case, 1 meter SMB-BNC cable, ¥12,000 / Set; HZ-15 five-piece set, including RF-R400-1/RF-R50-1/RF-U2.5-2 magnetic field probe and RF-E02/RF-E10 electric field probe, box, SMB-BNC cable, ¥21,000/set.
3) XF series passive near-field probes: 8 optional, frequency range: 30MHz ~ 6GHz, used for 6G high-frequency electric field and magnetic field measurement in the electronic module development stage. Single price: each contains a carrying case, 1 meter SMA-SMA cable (4846-UU), probe, XF-R400-1, XF-R100-1, XF-R3-1, XF-B3-1, The XF-U2.5-1 magnetic field probe and the XF-E04S and RF-E09S electric field probes each cost ¥4,600, and the XF-E10 electric field probes each cost ¥5,600. Kit price: XF1set five-piece set, including XF-R400-1/XF-R3-1/XF-B3-1/XF-U2.5-1 magnetic field probe and XF-E10 electric field probe, carrying case, 1 meter SMA connection Line, ¥ 21,000 / set.
4) OIMFA series active magnetic field probe and current probe, frequency range: 1MHz ~ 6GHz, very small probe, direct measurement module such as IC pin, micro-conductor or minimum package SMD device around the high-frequency magnetic field and current. Single price: including host, BT706 bias, 1 meter SMA-SMA RF cable (4846-UU), power adapter, carrying case, OIMFA-R0.2-75 magnetic field probe and OIMFA-K0.1-30 current The probes (1M~1GHz) each cost ¥7000, the OIMFA-R0.2-6 magnetic field probe and the OIMFA-K0.1-12 current probe (100M~6G) each cost ¥7600.
Kit price: OIMFA01set three-piece set, including OIMFA-R0.2-75/OIMFA-R0.2-6 magnetic field probe and OIMFA-K0.1-12 current probe, BT706 bias, power adapter, carrying case, 1 meter SMA cable, ¥24,200/set; OIMFA02set two-piece, instead of HZ530, with OIMFA-R0.2-75 magnetic field probe and OIMFA-K0.1-30 current probe, BT706 bias, power adapter, carrying case, 1 meter SMA cable, ¥17500/set.
5) SX series passive near-field probe: frequency range: 1GHz ~ 10GHz, used to measure the microwave electric field and magnetic field of electronic modules, components, IC pins. SX1set three-piece set, including SX-R3-1, SX-B3-1 magnetic field probe and SX-E03 electric field probe, carrying case, 1 meter SMA-SMA cable (4846-UU), ¥17600/set.
Third, interference radiation mechanism and electromagnetic compatibility measures teaching and training
Ocean Instruments' OIVM251 Interference Radiation Model Training Board is ideal for electronics engineers in both beginner and advanced training. OIVM251 has a variety of experimental training, enabling electronic engineers to have a better understanding of the electromagnetic processing of modern electronic products. This training demonstrates the effects of coupling mechanisms and electromagnetic compatibility measures from source to antenna interference emissions. Experiments include: different uses of the whip antenna, the use of the power filter, the use of the ground plane on the board, and programming with the 8051 microprocessor. OIVM251 interference radiation model training board, price: ¥9200
Fourth, the spectrum receiver and various accessories for testing
PCB board-level electromagnetic compatibility testing requires a variety of test instruments and RF devices such as spectrum receivers, amplifiers, impedance stabilization networks, impedance matchers, RF cables, test fixtures, attenuators, and VSWR bridges.
HZ24 Impedance Matcher and Attenuator Kit: Five-piece set: 50Ω pass-through load and 3dB/6dB/10dB/20dB fixed attenuator. Complete set price: ¥1600.
HZ22 pass-through impedance matching device: 50Ω to 1MΩ high impedance, power 1W, frequency DC~1GHz, ¥450.
HZ24-*dB fixed attenuator: 50Ω impedance, power 1W, frequency DC~1GHz, 3, 6, 10, 20 or 40dB attenuation, each ¥300.
XFT-75 MC pass-through impedance matcher: 75Ω to 1MΩ high impedance, power 1W, frequency DC~150MHz, ¥600.
XIW-1 MC pass-through impedance matching device: 75Ω male to 50Ω female, power 1W, frequency DC~300MHz, ¥850.
PL10 high-impedance matcher: 1MΩ male to 10MΩ female, power 1W, frequency DC~50MHz, ¥470.
PA000 Series Preamplifier: Also an external amplifier for amplifying RF signals for high sensitivity measurement of RF signals. The impedance is 50Ω. Three optional:
PA203 (HZ16) 20dB gain, BNC, 100K ~ 3G, price ¥ 4,500
PA303 (N9311X) 30dB gain, N type, 100K ~ 3G, price 6000 yuan
PA306 30dB gain, SMA connector, 100K ~ 6GHz, price ¥ 8500
HZ540 series standing wave ratio measuring bridge: cooperate with spectrum analyzer with built-in tracking source to measure the reflection parameters related to S11 such as resonance frequency point, return loss, reflection coefficient and voltage standing wave ratio of the antenna under test. . Traditional S-parameter measurements are performed using a network analyzer, but network analyzers are often expensive, and their popularity and frequency of use are far less than those of spectrum analyzers. A spectrum analyzer with a built-in tracking source enables frequency response testing of transmission characteristics such as filters, cables, amplifiers, etc., and an external measurement bridge or directional coupler for reflection characteristics testing. The VSWR bridge and the spectrum analyzer form a scalar network analysis system, which can quickly measure the return loss, voltage standing wave ratio, and reflection coefficient of the port of the device under test (DUT). There are two options: HZ541 reflection measurement bridge, 150K ~ 1.05GHz, price: 8500 yuan; HZ547 reflection measurement bridge, 100K ~ 3GHz, price: ¥ 11800 yuan.
Various connector and length RF cable: RF cable has a general impedance of 50Ω. Connectors are commonly used as: BNC, N-type, SMA, SMB. Cables are commonly used: RG58 and RG174. The polarity is divided into male and female. head. Marine instruments can be customized with different connectors and lengths of RF lines. It is recommended to have an RF connector and cable that can be combined in any combination: 5748 adapter assembly with interchangeable connector and 5749-48 cable assembly, which can form more than one hundred different couplings through two or two combinations or three or three combinations. , adapters, connectors or adapters, as well as a variety of cables, patch cords, video cables, RF cables, coaxial cables, and more. At least 472 different connections and application requirements can be formed, silver plated. Price: ¥5000 yuan / set
Impedance-stabilized network: measuring conducted interference on the line
HM6050-2D Power Supply Impedance Stabilization Network (LISN Two-Wire Type V): Measure line conducted interference (CISPR 16), switchable transient limiter, analog manual connector, voltage 220V, maximum current 16A in the range of 9kHz to 30MHz The impedance characteristic is Z = 50 Ω / (50 μH 5 Ω). Conducted interference on the power line of the overall device. Price: ¥13800
NNB21 Line Impedance Stabilization Network (LISN): Tests the conducted interference emission of the measured object according to the CISPR25/ISO7637 standard. It is used to measure the high frequency interference coupled on the motor vehicle circuit. It is suitable for detecting the circuit and network in the automotive circuit network during the development stage. Related interference emissions can be detected simultaneously or separately. Frequency: 100K ~ 1GHz, the maximum working voltage is 50V, and the maximum current is 10A. Price: ¥4700
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