{"id":2490,"date":"2019-08-02T06:40:23","date_gmt":"2019-08-02T06:40:23","guid":{"rendered":"https:\/\/35.94.173.37\/blog\/?p=2490"},"modified":"2024-11-05T06:42:11","modified_gmt":"2024-11-05T06:42:11","slug":"national-instruments-scxi-part-6","status":"publish","type":"post","link":"https:\/\/www.apexwaves.com\/blog\/national-instruments-scxi-part-6\/","title":{"rendered":"National Instruments SCXI: Part 6"},"content":{"rendered":"

Welcome to part 6 in our ongoing series about the\u00a0National Instruments SCXI platform<\/strong><\/a>! This blog post will describe several different SCXI terminal blocks.<\/p>\n

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National Instruments<\/strong>\u00a0has a variety of connectivity options for SCXI, including front-end terminal blocks, rack-mount terminal blocks, and DIN-rail mountable terminal blocks. Each terminal block is equipped with special features, giving you more versatility in your system. First, we will discuss some of the front mounting SCXI terminal blocks.<\/p>\n

One of these terminal blocks is the\u00a0SCXI-1300<\/strong><\/a>, which can be utilized to connect input signals to the\u00a0SCXI-1100<\/strong>,\u00a0SCXI-1102 Series<\/strong>, and\u00a0SCXI-1104<\/strong>\u00a0modules. The\u00a0SCXI-1300<\/strong>\u00a0is a general-purpose terminal block with an onboard temperature sensor for cold-junction compensation. You can also use the\u00a0SCXI-1300<\/strong>\u00a0with the\u00a0SCXI-1181<\/strong>\u00a0and\u00a0SCXI-1181K<\/strong>\u00a0modules. The\u00a0SCXI-1301<\/strong>\u00a0is a terminal block with 20 screw terminals for use with the\u00a0SCXI-1140<\/strong>,\u00a0SCXI-1181<\/strong>, and\u00a0SCXI-1181K<\/strong>\u00a0modules. The\u00a0SCXI-1302<\/strong>\u00a0has 50 screw terminals for use with the\u00a0SCXI-1180<\/strong>\u00a0feedthrough panel.<\/p>\n

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The\u00a0SCXI-1303<\/strong>\u00a0is a terminal block for use with the\u00a0SCXI-1100<\/strong>,\u00a0SCXI-1102<\/strong>, and\u00a0SCXI-1102B<\/strong>\/C<\/strong>\u00a0modules. Designed especially for extremely precise thermocouple measurements, this terminal block has an isothermal construction that reduces errors caused by thermal gradients between terminals and the cold-junction sensor. The\u00a0SCXI-1303<\/strong>\u00a0also includes circuitry for open-thermocouple detection, along with automatic ground referencing for floating (nongrounded) thermo-couples. When utilized with the\u00a0SCXI-1102<\/strong>\u00a0or the\u00a0SCXI-1102B\/C<\/strong>, the\u00a0SCXI-1303<\/strong>\u00a0delivers a high-impedance path (10 M Ohm) from the negative input terminal to ground, so the system works dependably with either floating or grounded thermocouples. When utilizing the\u00a0SCXI-1100<\/strong>, you can configure the channels of the\u00a0SCXI-1303<\/strong>\u00a0for floating or ground-referenced sources in blocks of eight channels.<\/p>\n

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The\u00a0SCXI-1304<\/strong><\/a>\u00a0is designed for the\u00a0SCXI-1140<\/strong>,\u00a0SCXI-1141<\/strong>,\u00a0SCXI-1142<\/strong>, and\u00a0SCXI-1143<\/strong>\u00a0modules. The\u00a0NI SCXI-1304<\/strong>\u00a0includes AC coupling circuitry, selectable with switches on every channel. Each channel of the\u00a0SCXI-1304<\/strong>\u00a0additionally includes a switchable connection to ground via a 100 k Ohm bias resistor to provide a reference for floating input sources. The AC coupling circuitry on every channel has a corner frequency of 0.16 Hz, rejection capacity of +\/-50 VDC, and an input impedance of 2 M Ohm differential, 1 M Ohm common mode.<\/p>\n

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The\u00a0SCXI-1305<\/strong>\u00a0has BNC connectors for use with the\u00a0SCXI-1120<\/strong>,\u00a0SCXI-1120D<\/strong>,\u00a0SCXI-1121<\/strong>,\u00a0SCXI-1125<\/strong>,\u00a0SCXI-1126<\/strong>,\u00a0SCXI-1140<\/strong>,\u00a0SCXI-1141<\/strong>,\u00a0SCXI-1142<\/strong>, and\u00a0SCXI-1143<\/strong>\u00a0modules. Functionally equivalent to the\u00a0SCXI-1304<\/strong>\u00a0terminal block, the\u00a0SCXI-1305<\/strong>\u00a0also has switchable AC coupling circuitry and ground referencing on each channel.<\/p>\n

Another option to choose from is the\u00a0SCXI-1308<\/strong>, which is a current input terminal block for the\u00a0SCXI-1100<\/strong>\u00a0and\u00a0SCXI-1102<\/strong>\u00a0Series analog input modules. Each input includes a 249 Ohms precision resistor, so you can read 0-20 mA and 4-20 mA current inputs.<\/p>\n

However, the\u00a0SCXI-1310<\/strong>\u00a0and\u00a0SCXI-1330<\/strong>\u00a0connector and shell assemblies are more affordable options to SCXI terminal blocks. A connector and shell assembly are comprised of a hardened plastic enclosure and solder pins for signal connection.<\/p>\n

With the\u00a0SCXI-1313<\/strong>, you can extend the input range of the\u00a0SCXI-1125<\/strong>\u00a0to 300 Vrms or 300 VDC. The extended input voltage range is enabled or disabled on a per-channel basis programmatically through software commands. The\u00a0SCXI-1313<\/strong>\u00a0additionally has an onboard temperature sensor for cold junction compensation with thermocouples.<\/p>\n

There is also the\u00a0SCXI-1314<\/strong><\/a>, which is a front-mounting terminal block for the\u00a0SCXI-1520<\/strong>\u00a0universal strain gauge input module, which can be utilized with 350 Ohm quarter bridge strain gauges. This terminal block includes a factory-installed and socketed 350 Ohm quarter-bridge completion resistor for every channel. Eight 120 Ohm resistors are included, but not installed for use with 120 Ohm quarter-bridge strain gauges. Additionally, the terminal block includes two factory-installed and socketed 100 Ohm shunt calibration resistors. All socketed resistors can be replaced by user-defined one-quarter resistors through a hole. This 8-channel terminal block offers 11 terminals for each strain gauge channel, comprised of signal +, signal -, power +, power -, remote sense +, remote sense -, quarter-bridge for each channel, two for shunt calibration A and two for shunt calibration B.<\/p>\n

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Yet another choice of terminal block is the\u00a0National Instruments SCXI-1314T<\/strong>. This terminal block is front-mounting and created for use with the\u00a0NI SCXI-1520<\/strong>\u00a0universal strain gage input module. The\u00a0NI SCXI-1314T<\/strong>\u00a0includes a built-in transducer electronic data sheet (TEDS) reader for Class II bridge-based smart TEDS sensors, a socketed 100 \u03a9 shunt calibration resistor for each channel, and an RJ50 Ethernet-style connector for each channel. The 8-channel terminal block delivers 10 terminals for each channel, comprised of signal+, signal-, power+, power-, remote sense+, remote sense-, shunt cal+, shunt cal-, TEDS+, and TEDS-.<\/p>\n

The last front-mounting terminal block to be discussed today is the\u00a0National Instruments SCXI-1315<\/strong>. This one is an 8-channel, front-mounting terminal block for the\u00a0NI SCXI-1540<\/strong>\u00a0LVDT input module with six terminals for each LVDT channel \u2014 CH+, CH-, EX+, EX-, Synch, and GND. With the SCXI-1315, you achieve a convenient connection to linear variable differential transformers (LVDTs), rotary variable differential transformers (RVDTs), and resolvers via screw terminals. There are 48 terminals organized in eight groups of six. Each group corresponds to one of the eight channels available on the\u00a0NI SCXI-1540<\/strong>.<\/p>\n

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Next week, part 7 in our SCXI blog series will discuss other types of front mounting SCXI terminal blocks. Keep checking back for future posts!<\/p>\n","protected":false},"excerpt":{"rendered":"

Welcome to part 6 in our ongoing series about the\u00a0National Instruments SCXI platform! This blog post will describe several different SCXI terminal blocks.   National Instruments\u00a0has a variety of connectivity options for SCXI, including front-end terminal blocks, rack-mount terminal blocks, and DIN-rail mountable terminal blocks. Each terminal block is equipped with special features, giving you […]<\/p>\n","protected":false},"author":1,"featured_media":2491,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8],"tags":[30,82,393,421,423,425,474],"class_list":["post-2490","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-national-instruments","tag-aerospace","tag-aviation","tag-national-instruments","tag-national-instruments-scxi","tag-national-instruments-scxi-end-of-life","tag-national-instruments-scxi-obsolete","tag-ni-scxi"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/posts\/2490","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/comments?post=2490"}],"version-history":[{"count":1,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/posts\/2490\/revisions"}],"predecessor-version":[{"id":2492,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/posts\/2490\/revisions\/2492"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/media\/2491"}],"wp:attachment":[{"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/media?parent=2490"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/categories?post=2490"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.apexwaves.com\/blog\/wp-json\/wp\/v2\/tags?post=2490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}