{"id":3328,"date":"2026-10-11T09:35:34","date_gmt":"2026-10-11T09:35:34","guid":{"rendered":"https:\/\/welleltron.com\/?p=3328"},"modified":"2026-10-11T09:41:34","modified_gmt":"2026-10-11T09:41:34","slug":"types-of-probes","status":"publish","type":"post","link":"https:\/\/welleltron.com\/ru\/blog\/types-of-probes\/","title":{"rendered":"What are the types of Probes"},"content":{"rendered":"<style>.kb-table-of-content-nav.kb-table-of-content-id3328_67095f-28 .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kb-table-of-content-nav.kb-table-of-content-id3328_67095f-28 .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id3328_67095f-28 .kb-table-of-contents-title{font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id3328_67095f-28 .kb-table-of-content-wrap .kb-table-of-content-list{font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}<\/style>\n\n\n<h2 class=\"wp-block-heading\">Two Major Types of Probes Based on Industry Demand<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Dedicated Industrial Sensors and Temperature Probes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Industrial facilities need reliable measurement devices to monitor equipment, maintain process stability, and improve product quality. Common industrial probes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Temperature probes:<\/strong> Measure the temperature of liquids, gases, machinery, and manufacturing processes.<\/li>\n\n\n\n<li><strong>Pressure probes:<\/strong> Detect pressure changes in pipelines, tanks, hydraulic systems, and pneumatic equipment.<\/li>\n\n\n\n<li><strong>Position and displacement probes:<\/strong> Measure movement, distance, alignment, or dimensional variation.<\/li>\n\n\n\n<li><strong>Electrical probes:<\/strong> Test voltage, current, resistance, or electrical continuity.<\/li>\n\n\n\n<li><strong>Environmental probes:<\/strong> Monitor parameters such as humidity, conductivity, and dissolved oxygen.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Specialized PCB Copper Thickness Measurement Probes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PCB copper measurement probes<\/strong> are designed for specific measurement locations. Some measure copper on an accessible board surface, while others measure copper deposited on the inside wall of a plated-through hole.Printed circuit boards (PCBs) contain copper foil, surface traces, plated-through holes, and, in many designs, microvias. Copper thickness affects electrical resistance, current-carrying capacity, thermal performance, and manufacturing quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, Hitachi High-Tech offers an <a href=\"https:\/\/welleltron.com\/ru\/test-equipment\/etp-probe\/oxford-cmi500-etp-probe\/\">ETP probe<\/a> for through-hole copper measurement and an <a href=\"https:\/\/welleltron.com\/ru\/test-equipment\/srp-4-probe\/hitachi-srp-4-probe\/\">SRP-4 probe<\/a> for surface copper thickness measurement on compatible CMI series instruments. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1.jpg\" alt=\"Etp Probe (1)\" class=\"wp-image-2148\" style=\"width:409px;height:auto\" srcset=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1.jpg 850w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-300x300.jpg 300w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-150x150.jpg 150w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-768x768.jpg 768w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-12x12.jpg 12w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-600x600.jpg 600w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/ETP-Probe-1-100x100.jpg 100w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><figcaption class=\"wp-element-caption\">Etp Probe (1)<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">PCB Copper Measurement Probes Breakdown<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In PCB fabrication, coating and plating thickness verification directly determines electrical performance, thermal management, and signal integrity. Within this niche, specialized micro-probing instruments are categorized based on <strong>where<\/strong> and <strong>how<\/strong> they measure copper density.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> <code>                   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                    \u2502      PCB Precision Measurement Probes   \u2502\n                    \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                         \u2502\n         \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n         \u25bc                                                               \u25bc\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                             \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502     Thru-Hole Inspection        \u2502                             \u2502    Surface Copper Inspection    \u2502\n\u2502  (Plated Through-Holes - PTH)   \u2502                             \u2502  (Traces, Foils, &amp; Surface Pads)\u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                             \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                 \u2502                                                               \u2502\n                 \u25bc                                                               \u25bc\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                             \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502    Eddy Current Technique       \u2502                             \u2502    4-Pin Micro-Resistance      \u2502\n\u2502  \u2022 ETP Probe \/ TRP Probe        \u2502                             \u2502  \u2022 SRP-4 Probe                  \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                             \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Thru-Hole (PTH) Copper Measurement Probes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Plated Through-Holes (PTH) connect internal and external circuit layers in multi-layer PCBs. Measuring internal hole wall copper thickness without destroying the board via micro-sectioning requires specialized eddy current sensors.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Electromagnetic Through-hole Probe (ETP):<\/strong> Designed specifically to enter narrow drill holes, generating localized electromagnetic fields to calculate barrel copper thickness accurately.<\/li>\n\n\n\n<li><strong>Temperature-Compensated Through-hole Probe (TRP):<\/strong> An evolution of eddy current thru-hole inspection, integrating thermal sensors to offset resistance changes caused by ambient heat on active plating lines.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Surface Copper Measurement Probes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Surface copper measurement demands a different physics approach. Because surface geometry varies across traces, pads, and ground planes, surface inspection probes utilize multi-pin contact resistance methods to isolate surface copper from underlying layers.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>4-Pin Micro-Resistance Probes (e.g., SRP-4 Probe):<\/strong> Featuring four spring-loaded contact pins, these sensors pass a small electrical current through the outer pins while measuring the precise voltage drop across the inner pins.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Main Types of PCB Copper Measurement Probes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">ETP Probe: Electromagnetic Through-hole Probe<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An <strong>Electromagnetic Through-hole Probe (ETP)<\/strong> is designed to measure the thickness of copper plating inside PCB through-holes. The Hitachi CMI500 and CMI700-compatible ETP probe uses eddy-current technology for this application.Its replacement verification and calibration standard is specifically designated for through-hole copper measurement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The principal advantages of an ETP probe include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rapid measurement for production inspection.<\/li>\n\n\n\n<li>Suitability for measuring plated-through-hole copper.<\/li>\n\n\n\n<li>Non-destructive measurement without sectioning every tested PCB.<\/li>\n\n\n\n<li>Applications involving copper plating before or after etching, subject to instrument configuration and process requirements.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">TRP Probe: Micro-Resistance Through-hole Measurement<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">TRP probes are another category used for PCB hole copper thickness inspection. Depending on the product family, they may use a micro-resistance measurement principle and be available in standard-hole or micro-hole configurations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common selection considerations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hole diameter and geometry.<\/li>\n\n\n\n<li>Board thickness.<\/li>\n\n\n\n<li>Copper plating thickness.<\/li>\n\n\n\n<li>Contact arrangement and probe-tip dimensions.<\/li>\n\n\n\n<li>Compatibility with the measurement instrument.<\/li>\n\n\n\n<li>Calibration and repeatability requirements.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">SRP-4 Probe: Four-Point Surface Copper Measurement<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>SRP-4 Probe<\/strong> is a micro-resistance probe designed for measuring copper thickness on PCB surfaces. The Hitachi CMI500-series product listing identifies the SRP-4 as a surface copper measurement probe with a standard tip spacing of 9.4 mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SRP-4 is useful for applications such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measuring surface copper thickness.<\/li>\n\n\n\n<li>Inspecting copper on single-sided, double-sided, and multilayer PCBs where accessible.<\/li>\n\n\n\n<li>Monitoring surface copper consistency during manufacturing.<\/li>\n\n\n\n<li>Evaluating copper foil, plating, or surface features within the instrument&#8217;s supported measurement range.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Oxford-CMI500-ETP-probe-1.webp\" alt=\"Oxford Cmi500 Etp Probe\" class=\"wp-image-1357\" srcset=\"https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Oxford-CMI500-ETP-probe-1.webp 500w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Oxford-CMI500-ETP-probe-1-300x300.webp 300w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Oxford-CMI500-ETP-probe-1-150x150.webp 150w, https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/Oxford-CMI500-ETP-probe-1-100x100.webp 100w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">ETP vs. TRP vs. SRP-4: Key Differences<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>ETP<\/th><th>TRP<\/th><th>SRP-4<\/th><\/tr><\/thead><tbody><tr><td>Primary application<\/td><td>Through-hole copper thickness<\/td><td>Through-hole copper thickness for supported geometries<\/td><td>Surface copper thickness<\/td><\/tr><tr><td>Typical principle<\/td><td>Eddy current<\/td><td>Micro-resistance in relevant product families<\/td><td>Four-point micro-resistance<\/td><\/tr><tr><td>Measurement location<\/td><td>Inner wall of a plated hole<\/td><td>Inner wall of a supported hole<\/td><td>Accessible PCB surface<\/td><\/tr><tr><td>Main selection factor<\/td><td>Hole geometry and instrument compatibility<\/td><td>Hole size, contact geometry, and instrument compatibility<\/td><td>Surface access and tip spacing<\/td><\/tr><tr><td>Best suited for<\/td><td>Fast inspection of supported plated-through holes<\/td><td>Hole measurements requiring compatible contact-based methods<\/td><td>Surface copper quality control<\/td><\/tr><tr><td>Key Benchmark Device<\/td><td><strong>Hitachi CMI500 ETP Probe<\/strong> \/ CMI760<\/td><td>Specialized High-Temp Inspection Stations<\/td><td>Hitachi CMI700 \/ CMI760 Systems<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Calibration, Maintenance, and Ensuring Measurement Accuracy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">High-precision non-destructive testing probes are delicate instruments. To maintain sub-micron repeatability, production teams must adhere to standard quality control protocols:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510     \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510     \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502   1. Visual Tip Check     \u2502 \u2500\u2500\u25ba \u2502  2. Zero-Point Calibration \u2502 \u2500\u2500\u25ba \u2502  3. Standard Plate Check  \u2502\n\u2502 Inspect for wear or dirt  \u2502     \u2502  Calibrate on bare base   \u2502     \u2502  Verify with NIST plate   \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518     \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518     \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Mandatory Use of Calibration Standard Plates:<\/strong> A sensor is only as reliable as its baseline. Operators must calibrate sensors using a certified <a href=\"https:\/\/welleltron.com\/ru\/test-equipment\/calibration-standard-plate\/hitachi-srp-4-calibration-standard\/\"><strong>Calibration Standard Plate<\/strong> <\/a>(such as NIST-traceable standards) matched to expected copper thickness ranges prior to each shift.<\/li>\n\n\n\n<li><strong>Proper Insertion Alignments:<\/strong> When performing hole inspections with an <strong>etp probe<\/strong>, operators should utilize an inspection stand to ensure vertical alignment. Tilting the sensor during insertion can wear down the tip coating or cause inaccurate readings.<\/li>\n\n\n\n<li><strong>Pin Tip Maintenance for SRP-4 Sensors:<\/strong> Micro-resistance probes accumulate oxidation or residual flux over time. Regular gentle cleaning with isopropyl alcohol ensures uniform electrical contact across all four pins.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">How to Select the Right Probe <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When comparing industrial probes or PCB copper measurement probes, consider the following factors:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Measurement objective:<\/strong> Determine whether you need temperature, pressure, surface copper, or through-hole copper measurement.<\/li>\n\n\n\n<li><strong>Sensing principle:<\/strong> Choose the technology appropriate for the material, geometry, and required accuracy.<\/li>\n\n\n\n<li><strong>Physical dimensions:<\/strong> Check hole diameter, board thickness, available contact area, and probe-tip spacing.<\/li>\n\n\n\n<li><strong>Instrument compatibility:<\/strong> Confirm the exact model and supported accessories.<\/li>\n\n\n\n<li><strong>Calibration:<\/strong> Establish how the probe will be verified and how often calibration checks are required.<\/li>\n\n\n\n<li><strong>Production environment:<\/strong> Consider temperature, contamination, vibration, throughput, and operator handling.<\/li>\n\n\n\n<li><strong>Documentation:<\/strong> Review manufacturer specifications, calibration records, and applicable quality requirements.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">For PCB production, the most effective inspection strategy may combine multiple probes. For example, an ETP probe can be used for through-hole copper measurement, while an SRP-4 can assess surface copper thickness. A compatible TRP configuration may be added when hole geometry or measurement requirements call for it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently  About Probes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is a probe?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A probe is an instrument or sensing component used to measure, detect, test, or investigate a physical property. Its design depends on the application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What does probe mean in PCB manufacturing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In PCB manufacturing, a probe may refer to a sensor used to measure copper thickness, test electrical characteristics, or inspect a specific board feature.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the difference between ETP and SRP-4?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ETP uses eddy-current technology for through-hole copper thickness measurement, while SRP-4 uses micro-resistance technology to measure surface copper thickness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is TRP the same as ETP?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. They may serve the same broad purpose of measuring hole copper, but their measurement principles, contact arrangements, and supported geometries can differ. Confirm the specifications of the particular TRP product.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is a status probe?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The term <em>status probe<\/em> usually describes a software or system-health check that reports whether a service, endpoint, or component is operating normally. It is different from a physical measurement probe used in industrial sensing or PCB testing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How should an ETP probe be calibrated?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use the compatible instrument and the correct through-hole copper calibration standard, following the manufacturer&#8217;s procedure. Confirm the instrument configuration and measurement position before evaluating the result.<\/p>","protected":false},"excerpt":{"rendered":"<p>A Complete Guide to ETP Probes, TRP, SRP-4 Probes, and Industrial Sensors<\/p>","protected":false},"author":1,"featured_media":1493,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"taxonomy_info":{"category":[{"value":1,"label":"Blog"}]},"featured_image_src_large":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-1024x681.png",1024,681,true],"author_info":{"display_name":"luciasmilelove@gmail.com","author_link":"https:\/\/welleltron.com\/ru\/blog\/author\/luciasmilelovegmail-com\/"},"comment_info":0,"category_info":[{"term_id":1,"name":"Blog","slug":"blog","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"Blog","parent":0,"count":14,"filter":"raw","cat_ID":1,"category_count":14,"category_description":"Blog","cat_name":"Blog","category_nicename":"blog","category_parent":0}],"tag_info":false,"uagb_featured_image_src":{"full":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video.png",1199,797,false],"thumbnail":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-150x150.png",150,150,true],"medium":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-300x199.png",300,199,true],"medium_large":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-768x511.png",768,511,true],"large":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-1024x681.png",1024,681,true],"1536x1536":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video.png",1199,797,false],"2048x2048":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video.png",1199,797,false],"trp-custom-language-flag":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video.png",18,12,false],"woocommerce_thumbnail":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-300x300.png",300,300,true],"woocommerce_single":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-600x399.png",600,399,true],"woocommerce_gallery_thumbnail":["https:\/\/welleltron.com\/wp-content\/uploads\/2025\/12\/welleltron_video-100x100.png",100,100,true]},"uagb_author_info":{"display_name":"luciasmilelove@gmail.com","author_link":"https:\/\/welleltron.com\/ru\/blog\/author\/luciasmilelovegmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"A Complete Guide to ETP Probes, TRP, SRP-4 Probes, and Industrial Sensors","_links":{"self":[{"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/posts\/3328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/comments?post=3328"}],"version-history":[{"count":0,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/posts\/3328\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/media\/1493"}],"wp:attachment":[{"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/media?parent=3328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/categories?post=3328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/welleltron.com\/ru\/wp-json\/wp\/v2\/tags?post=3328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}