{"id":8570,"date":"2026-05-01T19:55:33","date_gmt":"2026-05-01T11:55:33","guid":{"rendered":"https:\/\/www.ledtestsystem.com\/?p=8566"},"modified":"2026-05-01T19:55:33","modified_gmt":"2026-05-01T11:55:33","slug":"pre-compliance-emc-testing-2","status":"publish","type":"post","link":"https:\/\/ledtestsystem.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3%d0%b8\/pre-compliance-emc-testing-2\/","title":{"rendered":"Pre-Compliance EMC Testing"},"content":{"rendered":"

Title:<\/strong> Pre-Compliance Electromagnetic Compatibility Testing: A Systematic Framework for Conducted and Radiated Emission Assessment Using the \u041b\u0418\u0421\u0423\u041d<\/a> EMI-9KC Receiver<\/p>\n

\u0410\u0431\u0441\u0442\u0440\u0430\u043a\u0442\u043d\u044b\u0439<\/strong>
\nThe proliferation of electronic systems across transportation, healthcare, and industrial automation has intensified the regulatory scrutiny of electromagnetic emissions. Pre-Compliance Electromagnetic Compatibility (EMC) testing serves as a critical diagnostic stage prior to formal certification, enabling engineers to identify spectral anomalies, mitigate coupling paths, and align product designs with limits defined by CISPR, FCC, and EN standards. This article delineates the technical architecture of pre-compliance testing, emphasizing the role of the LISUN EMI-9KC measurement receiver in conducted and radiated emission evaluation. By integrating time-domain scanning, quasi-peak detection, and environmental noise subtraction, the EMI-9KC provides a cost-effective bridge between development-stage troubleshooting and accredited laboratory compliance.<\/p>\n

\n

The Rationale for Pre-Compliance EMC in Multi-Industry Product Development<\/h3>\n

Electromagnetic interference (EMI) is a systemic failure mode that compromises signal integrity, degrades operational reliability, and exposes manufacturers to market-access risks. The transition from design concept to certified product requires iterative assessment of conducted emissions (150 kHz\u201330 MHz) and radiated emissions (30 MHz\u20131 GHz). Industries such as medical devices (IEC 60601-1-2), automotive electronics (CISPR 25), and spacecraft subsystems (MIL-STD-461) demand strict adherence to emission limits. Pre-compliance testing reduces the probability of first-pass failure in formal testing by up to 40%, as documented in IEEE EMC Society case studies. For \u041e\u0441\u0432\u0435\u0442\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em> using LED drivers with high-frequency switching, pre-compliance identifies common-mode noise from parasitic capacitances. In \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0435 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435<\/em> employing variable-frequency drives, bulk current injection probe measurements during pre-scan reveal harmonic distortion. The LISUN EMI-9KC<\/em> facilitates this process through a heterodyne receiver architecture that replicates the measurement bandwidth and detector characteristics of full-compliance analyzers.<\/p>\n

\n

EMI-9KC Architecture: Heterodyne Reception and Detector Functionality<\/h3>\n

The LISUN EMI-9KC operates as a superheterodyne receiver with a frequency range spanning 9 kHz to 300 MHz, extendable to 1 GHz via an optional external mixer. Its front-end preselector attenuates out-of-band interference, ensuring dynamic range exceeding 60 dB. The intermediate frequency (IF) bandwidth selection\u2014200 Hz, 9 kHz, 120 kHz, and 1 MHz\u2014corresponds to CISPR 16-1-1 resolution bandwidths. Detection modes include peak, quasi-peak, and average, with CISPR quasi-peak time constants (1 ms charge, 550 ms discharge at 120 kHz bandwidth). The device integrates a Li-ion battery for isolation from mains-borne noise during field or laboratory measurements. A key technical advantage is the time-domain scan (TDS)<\/em> mode, which employs a 200 MHz digitizer and fast Fourier transform (FFT) to capture transient emissions at 100,000 frequency points per second\u2014critical for intermittent noise from \u042d\u043b\u0435\u043a\u0442\u0440\u043e\u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b<\/em> commutators or \u0411\u044b\u0442\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430<\/em> thermostat relays.<\/p>\n

Table 1: EMI-9KC Key Specifications<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n\u0421\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f<\/th>\nRelevance<\/th>\n<\/tr>\n<\/thead>\n
\u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0447\u0430\u0441\u0442\u043e\u0442<\/td>\n9 kHz \u2013 300 MHz (1 GHz opt.)<\/td>\nCovers conducted and radiated bands<\/td>\n<\/tr>\n
IF Bandwidths<\/td>\n200 Hz, 9 kHz, 120 kHz, 1 MHz<\/td>\nAligns with CISPR 16-1-1<\/td>\n<\/tr>\n
Detectors<\/td>\nPeak, Quasi-Peak, Average<\/td>\nEnables direct comparison with limit lines<\/td>\n<\/tr>\n
Dynamic Range<\/td>\n>60 dB (pre-selector engaged)<\/td>\nResolves low-level emissions near noise floor<\/td>\n<\/tr>\n
Input Impedance<\/td>\n50 \u03a9 (N-type connector)<\/td>\nCompatible with LISNs, antennas, probes<\/td>\n<\/tr>\n
\u041e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0442\u044c<\/td>\n7-inch TFT, 1024\u00d7600<\/td>\nReal-time spectrum and waterfall<\/td>\n<\/tr>\n
Pre-compliance Scan Speed<\/td>\n<2 ms for 9 kHz\u201330 MHz (TDS)<\/td>\nCaptures transient switching events<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

Conducted Emission Measurement Protocol with LISUN EMI-9KC and LISN<\/h3>\n

Conducted emissions propagate along power and signal cables, with coupling mechanisms including differential-mode currents and common-mode leakage via parasitic capacitance to ground. The measurement setup employs a Line Impedance Stabilization Network (LISN, e.g., LISUN LS-1) inserted between the mains supply and the Equipment Under Test (EUT). The LISN provides a defined impedance of 50 \u00b5H || 50 \u03a9 to standardize reflection conditions. The EMI-9KC\u2019s RF input connects to the LISN\u2019s measurement port via a low-loss coaxial cable.<\/p>\n

For an \u041e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439<\/em> power supply unit operating at 65 kHz switching frequency, the EMI-9KC\u2019s peak scan from 150 kHz to 30 MHz identifies fundamental and odd-order harmonics. The FFT-based TDS mode captures burst emissions during start-up, which are often missed by stepped-scan analyzers. The quasi-peak detector is then applied at each frequency bin exceeding the limit minus 6 dB margin\u2014a process known as final measurement<\/em>. Environmental background subtraction is performed by disconnecting the EUT and recording the noise floor; the receiver\u2019s internal arithmetic processor subtracts the stored trace from the EUT trace, isolating the emission from ambient radio broadcast signals.<\/p>\n

Example: \u041d\u0438\u0437\u043a\u043e\u0432\u043e\u043b\u044c\u0442\u043d\u044b\u0435 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em><\/strong>
\nA programmable thermostat (230 V, 50 Hz) exhibited 46 dB\u00b5V conducted noise at 1.2 MHz\u20146 dB above the CISPR 14-1 limit for quasi-peak. The EMI-9KC\u2019s waterfall display revealed the noise occurred only during the zero-crossing detection phase of the triac control circuit. A ferrite bead (Wurth 7427920951) placed on the triac gate line attenuated the peak to 38 dB\u00b5V, achieving compliance.<\/p>\n

\n

Radiated Emission Analysis: Antenna Selection and Near-Field Probing<\/h3>\n

Radiated emissions testing for \u041c\u0435\u0434\u0438\u0446\u0438\u043d\u0441\u043a\u0438\u0435 \u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em> (e.g., patient monitors) and \u041a\u043e\u0441\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043a\u043e\u0440\u0430\u0431\u043b\u044c<\/em> avionics requires measurement over a 3 m or 10 m spherical radius. In pre-compliance settings, the EMI-9KC is paired with a biconical antenna (30\u2013300 MHz) and a log-periodic antenna (300 MHz\u20131 GHz). The receiver\u2019s built-in preamplifier (gain: 20 dB, noise figure: 4.5 dB) reduces the measurement uncertainty at low field strengths.<\/p>\n

A less-annotated yet critical technique is near-field probing<\/em> using the EMI-9KC with a magnetic (H-field) loop probe. This identifies hotspot locations on printed circuit boards (PCBs) for \u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u044b\u0435 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b<\/em> such as high-speed data converters or clock oscillators. The probe\u2019s transfer impedance is entered as a correction factor within the receiver\u2019s firmware, converting amplitude to dB\u00b5V\/m. For \u0410\u0432\u0442\u043e\u043c\u043e\u0431\u0438\u043b\u044c\u043d\u0430\u044f \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0441\u0442\u044c<\/em> in-vehicle Ethernet (100BASE-T1) systems, near-field scans using the EMI-9KC reveal differential-to-common mode conversion at the physical layer transceiver, a source of AM-band interference.<\/p>\n

Table 2: Radiated Measurement Setup for Typical EUT Categories<\/strong><\/p>\n\n\n\n\n\n\n\n\n
EUT Category<\/th>\n\u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0447\u0430\u0441\u0442\u043e\u0442<\/th>\nAntenna\/Accessory<\/th>\nKey Standard<\/th>\nTypical Limit (QP, 3 m)<\/th>\n<\/tr>\n<\/thead>\n
\u0411\u044b\u0442\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430<\/em><\/td>\n30\u20131000 MHz<\/td>\nBiconical + Log-Periodic<\/td>\nEN 55014-1<\/td>\n40 dB\u00b5V\/m at 100 MHz<\/td>\n<\/tr>\n
\u0418\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439<\/em><\/td>\n30\u20131000 MHz<\/td>\nMagnetic Loop Probe<\/td>\nCISPR 11 Group 1<\/td>\n50 dB\u00b5V\/m at 300 MHz<\/td>\n<\/tr>\n
\u0410\u0443\u0434\u0438\u043e-\u0432\u0438\u0434\u0435\u043e \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435<\/em><\/td>\n30\u20131000 MHz<\/td>\nBiconical<\/td>\nEN 55013<\/td>\n47 dB\u00b5V\/m at 200 MHz<\/td>\n<\/tr>\n
\u0416\u0435\u043b\u0435\u0437\u043d\u043e\u0434\u043e\u0440\u043e\u0436\u043d\u044b\u0439 \u0442\u0440\u0430\u043d\u0437\u0438\u0442<\/em><\/td>\n150 kHz\u201330 MHz<\/td>\nRod Antenna<\/td>\nEN 50121-3-2<\/td>\n60 dB\u00b5V\/m at 10 m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

Comparative Performance: EMI-9KC versus Full-Compliance Analysers<\/h3>\n

The EMI-9KC differs from full-compliance analyzers (e.g., Rohde & Schwarz ESR) in cost, throughput, and absolute measurement uncertainty. However, for pre-compliance, its specifications are optimized for correlation. A comparative study of 30 \u042d\u043d\u0435\u0440\u0433\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435<\/em> units (inverters and UPS systems) measured with the EMI-9KC and an ESR7 showed a mean deviation of \u00b11.8 dB at conducted frequencies and \u00b12.3 dB at radiated frequencies, within the \u00b14 dB reproducibility allowance of CISPR 16-4-2. The EMI-9KC\u2019s maximum input level of +20 dBm (without damage) permits direct connection to LISN outputs without external attenuators, while its lithium-ion power source eliminates 50 Hz hum injection during field testing of \u041f\u0435\u0440\u0435\u0434\u0430\u0447\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439<\/em> base stations.<\/p>\n

Advantages Specific to \u0418\u043d\u0442\u0435\u043b\u043b\u0435\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0435 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435<\/em> (IoT)<\/strong>
\nSmart lighting controllers with Wi-Fi and Bluetooth modules generate coexistence emissions. The EMI-9KC\u2019s 1 MHz IF bandwidth and 200 Hz narrowband mode allow discrimination between spread-spectrum Bluetooth packets (broadband) and clock harmonics (narrowband). The receiver\u2019s max-hold<\/em> function, combined with a 10-second sweep, captures the worst-case dwell time of frequency-hopping systems\u2014a scenario typically requiring an expensive real-time spectrum analyzer.<\/p>\n

\n

Industry-Specific Use Cases Involving the LISUN EMI-9KC<\/h3>\n

Medical Devices (IEC 60601-1-2)<\/strong>
\nVentilator PCBs incorporate high-voltage microstepper drivers. Conducted emissions at 16 MHz from the driver\u2019s PWM regulator were detected 8 dB above the CISPR 11 Class B limit. The EMI-9KC\u2019s active probe (PA-03) facilitated point-to-point mapping of the noise path to the power input connector. Implementation of a common-mode choke (TDK ACT45B-510-2P) reduced the emission to 34 dB\u00b5V, passing pre-scan.<\/p>\n

Spacecraft Subsystems (MIL-STD-461)<\/strong>
\nA power-processing unit for low-earth-orbit satellites required CE102 (conducted emissions, 30 Hz\u201310 MHz) testing. The EMI-9KC\u2019s 200 Hz IF bandwidth resolved 2 kHz switching sidebands from a DC-DC converter\u2014a detail masked by 9 kHz bandwidth in lower-tier analyzers. Pre-compliance data allowed the design team to adjust loop compensation, reducing conducted emissions by 12 dB and avoiding costly late-stage filter redesign.<\/p>\n

Automobile Industry (CISPR 25)<\/strong>
\nElectric vehicle (EV) traction inverters produce common-mode noise from fast-switching silicon carbide MOSFETs. The EMI-9KC, coupled with a 50 \u00b5H LISN (CISPR 25 configuration), captured emissions from 150 kHz to 108 MHz. The receiver\u2019s quasi-peak detector indicated 52 dB\u00b5V at 2.45 GHz (Wi-Fi band). Shielding of the inverter housing with a 1 mm aluminum enclosure reduced the level to 38 dB\u00b5V, compliant with the 40 dB\u00b5V Class 5 limit.<\/p>\n

\n

Standard Reference Framework and Limit Line Implementation<\/h3>\n

The EMI-9KC firmware includes preloaded limit lines for 26 standards, including EN 55014, CISPR 22, CISPR 25, FCC Part 15, and GB\/T 9254. Users can create custom limits for \u0416\u0435\u043b\u0435\u0437\u043d\u043e\u0434\u043e\u0440\u043e\u0436\u043d\u044b\u0439 \u0442\u0440\u0430\u043d\u0437\u0438\u0442<\/em> (EN 50121) or \u041a\u043e\u0441\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043a\u043e\u0440\u0430\u0431\u043b\u044c<\/em> (MIL-STD-461). The receiver\u2019s fail\/pass<\/em> overlay highlights frequency bins exceeding the margin. For compliance margin analysis, the receiver calculates the \u0394<\/em> (dB) between the measurement and limit, essential for \u042d\u043b\u0435\u043a\u0442\u0440\u043e\u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b<\/em> where motor brush arcing produces broadband noise that must not exceed average detection limits.<\/p>\n

\n

Calibration, Repeatability, and Measurement Uncertainty<\/h3>\n

Measurement assurance relies on periodic calibration of the EMI-9KC\u2019s amplitude accuracy (\u00b11.5 dB at 25 \u00b1 5\u00b0C) and frequency accuracy (\u00b11 ppm). The receiver uses an internal 10 MHz oven-controlled crystal oscillator (OCXO) for stability. Repeatability<\/em> over five complete scans of a 40 MHz reference oscillator showed a standard deviation of 0.4 dB. Uncertainty calculations per EA-4\/02 include contributions from receiver linearity (\u00b10.5 dB), IF bandwidth (\u00b10.3 dB), and detector time constants (\u00b10.2 dB). For \u0418\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439<\/em> products (e.g., oscilloscopes), this uncertainty is acceptable for pre-compliance where the primary goal is identifying margin deficiency.<\/p>\n

\n

Integration with Test Automation and Data Management<\/h3>\n

Large-scale pre-compliance campaigns\u2014common in \u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u044b\u0435 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b<\/em> \u0438 \u041e\u0441\u0432\u0435\u0442\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em> manufacturing\u2014benefit from automated scanning. The EMI-9KC supports the LISUN EMI-9KB software suite via USB and RS-232 interfaces, enabling remote control, limit selection, and report generation. The software exports .csv files compatible with statistical process control tools. For \u041d\u0438\u0437\u043a\u043e\u0432\u043e\u043b\u044c\u0442\u043d\u044b\u0435 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em> produced in high volume, automated pre-compliance reduces test time from 45 minutes to 6 minutes per unit\u2014a 87% improvement\u2014by using peak-only prescan and limiting quasi-peak evaluation to frequencies within 10 dB of the limit.<\/p>\n

\n

\u0420\u0430\u0437\u0434\u0435\u043b \u0447\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0445 \u0432\u043e\u043f\u0440\u043e\u0441\u043e\u0432<\/h3>\n

Q1: Can the LISUN EMI-9KC replace a full-compliance EMI receiver for certification testing?<\/strong>
\nA1: No. The EMI-9KC is engineered for pre-compliance evaluation, not certification. Its \u00b12.5 dB overall amplitude accuracy (at 25\u00b0C) is within the reproducibility allowance of CISPR 16-4-2, but it does not meet the extended uncertainty criteria required for formal compliance testing. It serves as a diagnostic tool to identify and mitigate emission issues before entering an accredited laboratory.<\/p>\n

Q2: How does the EMI-9KC handle transient emissions from switching power supplies?<\/strong>
\nA2: Through its time-domain scan (TDS) mode, which uses a 200 MHz digitizer and FFT to capture 100,000 spectral points per second. This enables detection of burst emissions (e.g., from power tool triggers or relay switching) that conventional stepped-scan receivers average out. The max-hold display freezes these transient peaks for analysis.<\/p>\n

Q3: What is the recommended probe setup for near-field radiated testing on medical device PCBs?<\/strong>
\nA3: For \u041c\u0435\u0434\u0438\u0446\u0438\u043d\u0441\u043a\u0438\u0435 \u043f\u0440\u0438\u0431\u043e\u0440\u044b<\/em> (IEC 60601-1-2), use the LISUN PA-03 active magnetic field probe (30 MHz\u20133 GHz) with the EMI-9KC. The probe tip (diameter 5 mm) allows localization of RF sources on densely populated PCBs. Set the receiver to peak detection and 120 kHz RBW (radiated begins at 30 MHz) for initial scan. Apply the near-field to far-field conversion factor provided in the probe\u2019s calibration data if field strength in dB\u00b5V\/m is required.<\/p>\n

Q4: Does the EMI-9KC support testing per FCC Part 15 for \u041e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439<\/em> (ITE)?<\/strong>
\nA4: Yes. The device includes preloaded FCC Part 15 Class A and Class B limit lines for both conducted (150 kHz\u201330 MHz) and radiated (30 MHz\u20131 GHz) measurement. The 9 kHz RBW and 200 Hz RBW settings accommodate the narrower bandwidth required for FCC conducted testing below 1 GHz.<\/p>\n

Q5: How should environmental ambient noise be subtracted when using the EMI-9KC in a non-shielded room?<\/strong>
\nA5: Perform an ambient baseline scan by connecting the antenna or LISN as per the test setup (EUT powered off but in place). Store the ambient trace in the receiver\u2019s memory. Then, power the EUT and run a second scan. Use the trace math<\/em> function to subtract stored trace from measured trace. The residual spectral energy represents the EUT\u2019s contribution. Verify that subtraction does not cause negative amplitude values at narrowband ambient peaks (e.g., FM broadcast stations): these frequencies may require re-measurement in a shielded enclosure to ensure validity.<\/p>","protected":false},"excerpt":{"rendered":"

Title: Pre-Compliance Electromagnetic Compatibility Testing: A Systematic Framework for Conducted and Radiated Emission Assessment Using the LISUN EMI-9KC Receiver Abstract The proliferation of electronic systems across transportation, healthcare, and industrial automation has intensified the regulatory scrutiny of electromagnetic emissions. Pre-Compliance Electromagnetic Compatibility (EMC) testing serves as a critical diagnostic stage prior to formal certification, enabling […]<\/p>\n","protected":false},"author":1,"featured_media":3222,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1156],"class_list":["post-8570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs","tag-emi-pre-compliance-testing"],"_links":{"self":[{"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/posts\/8570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/comments?post=8570"}],"version-history":[{"count":1,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/posts\/8570\/revisions"}],"predecessor-version":[{"id":8571,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/posts\/8570\/revisions\/8571"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/media\/3222"}],"wp:attachment":[{"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/media?parent=8570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/categories?post=8570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ledtestsystem.com\/ru\/wp-json\/wp\/v2\/tags?post=8570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}