{"id":1397,"date":"2019-10-24T08:00:23","date_gmt":"2019-10-24T12:00:23","guid":{"rendered":"http:\/\/blog.pasternack.com\/?p=1397"},"modified":"2019-10-18T09:52:48","modified_gmt":"2019-10-18T13:52:48","slug":"rf-test-equipment-series-calibration-kits","status":"publish","type":"post","link":"\/blog\/vector-network-analyzer-cal-kit\/rf-test-equipment-series-calibration-kits\/","title":{"rendered":"RF Test Equipment Series: Calibration Kits"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1400\" src=\"\/blog\/wp-content\/uploads\/2019\/10\/cal-kit.jpg\" alt=\"\" width=\"500\" height=\"334\" srcset=\"\/blog\/wp-content\/uploads\/2019\/10\/cal-kit.jpg 500w, \/blog\/wp-content\/uploads\/2019\/10\/cal-kit-235x157.jpg 235w, \/blog\/wp-content\/uploads\/2019\/10\/cal-kit-150x100.jpg 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/>RF calibration kits are a key tool in ensuring that Vector Network Analyzer (VNA) and other RF instruments provide accurate measurements to the testing plane of the device. Due to the intrinsic addition of phase and impedance variation over RF test equipment interconnect, measurements from a VNA made without calibration will include the S-parameter and time-domain characteristics of the interconnect test system. A calibration kit is used to provide a reference plane that starts at the interconnect to the DUT. This way, complex de-embedding can be automatically performed by the RF test equipment (mainly VNAs) without additional manipulation of the data.<\/p>\n<p><strong>Purpose of an RF Calibration Kit (or Module)<\/strong><\/p>\n<p>\u2022 Provide corrective factors for broadband impedance matching of a VNA to the test plane<br \/>\n\u2022 Generate corrective factors for the limited directivity of VNA internal hardware<br \/>\n\u2022 Remove the frequency response introduced by test system interconnect to the test plane<\/p>\n<p>There are a few variations of calibration kits. Mainly, there are two types, mechanical calibration kits and electronic calibration (ECal) modules. Mechanical calibration kits typically have a short, open, load, and through (SOLT) for typical coaxial testing, but there are a variety of other calibration kit types for various other calibration algorithms. The type of calibration kit and algorithm used is determined by the engineer and should be a best fit for the type of system the engineer is testing.<\/p>\n<p><strong>Calibration Algorithm Summary<\/strong><\/p>\n<p>\u2022 Short-Open-Load-Through (SOLT): common with coaxial interconnect<br \/>\n\u2022 Short-Short-Load-Through (SSLT): common with waveguide<br \/>\n\u2022 Short-Short-Short-Through (SSST): common for high frequency waveguide or coaxial measurements (shorts with different offset lengths)<br \/>\n\u2022 Reciprocal instead of through (SOLR\/SSLR\/SSSR): used when a good through isn\u2019t available<br \/>\n\u2022 Line-Reflect-Line (LRL): high precision coaxial, waveguide, or wafer-level<br \/>\n\u2022 Advanced Line-Reflect-Match (ALRM): high precision<\/p>\n<p>With a mechanical calibration kit a user needs to connect and disconnect each of the calibration standards to the test interconnect attached to the VNA ports in a precise process indicated by the calibration algorithm. As this process can be considered cumbersome, several companies have introduced eCal modules that include internal standards and automation that performs each step of the calibration algorithm with only one interconnect. This can help to mitigate the uncertainty introduced by variations in a manual connection process.<\/p>\n<p>Calibration also introduces some level of uncertainty to the measurements. This is why there is an emphasis on the quality of a calibration kit. As these uncertainties often worsen at higher frequencies, calibration kits are typically specified to a maximum frequency. In some cases, the calibration kit interconnect may not be a perfect match to the VNA output ports and precision adapters are required to mate the calibration kit to the VNA interconnect. It is generally recommended to limit the interconnect to as short and lowest number of connections possible to ensure higher precision measurements, which is why some calibration kits are ordered alongside high-precision adapters.<\/p>\n<p><strong>Useful Calibration Kit Accessories and Equipment<\/strong><\/p>\n<p><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Calibration+Kits+Portable%5ECalibration+Kits%5ECalibration+Kits+Components&amp;keywords=calibration+ports+vna&amp;sort=y&amp;searchtype=1&amp;view_type=grid\">\u2022 Pasternack VNA Calibration Kits<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Cable+Assemblies&amp;Rfinca99rfcablegn=PE-VNA-HF%5EPE-VNA-R%5EFlexible+Cable%5EPE-TC110%5EPE-FF430&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack Phase Stable (VNA) Coaxial Cables<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Cable+Assemblies&amp;Rfinca99rfcablegn=160+Series%5EPE-P141%5EPE-P142LL%5EPE-P300LL%5EPE-P102&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack Cable Generic Test Cable Assemblies<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Cable+Assemblies&amp;Rfinca99designtype=Skew+Matched+Pair&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack Skew Matched Pair Coaxial Cable<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Adapters&amp;Rfinad99con1series=1.0mm%5E2.4mm%5E1.85mm%5E2.4mm+NMD%5E2.92mm%5E2.92mm+NMD%5E3.5mm%5E3.5mm+NMD%5E7mm&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack Precision Coaxial Adapters<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Adapters&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack In-series and Between-series Adapters<\/a><\/span><br \/>\n<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.pasternack.com\/nsearch.aspx?Category=Microwave+Probes%5ETools+Miscellaneous&amp;keywords=PE2PB&amp;sort=y&amp;view_type=grid\">\u2022 Pasternack RF Coaxial Probe<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>RF calibration kits are a key tool in ensuring that Vector Network Analyzer (VNA) and other RF instruments provide accurate measurements to the testing plane of the device. Due to the intrinsic addition of phase and impedance variation over RF test equipment interconnect, measurements from a VNA made without calibration will include the S-parameter and ..<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[210],"tags":[535,537,483,536],"class_list":["post-1397","post","type-post","status-publish","format-standard","hentry","category-vector-network-analyzer-cal-kit","tag-calibration-kit","tag-rf-calibration-kit","tag-rf-test-equipment","tag-vna-calibration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RF Test Equipment Series: Calibration Kits - Pasternack Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"\/blog\/vector-network-analyzer-cal-kit\/rf-test-equipment-series-calibration-kits\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RF Test Equipment Series: Calibration Kits - Pasternack Blog\" \/>\n<meta property=\"og:description\" content=\"RF calibration kits are a key tool in ensuring that Vector Network Analyzer (VNA) and other RF instruments provide accurate measurements to the testing plane of the device. 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