{"id":34974,"date":"2026-08-08T17:29:27","date_gmt":"2026-08-08T09:29:27","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=34974"},"modified":"2026-09-07T20:28:22","modified_gmt":"2026-09-07T12:28:22","slug":"ni-9437","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/ni-9437\/","title":{"rendered":"NI-9437"},"content":{"rendered":"<h3>NI-9437 8-Channel High-Voltage Digital Input Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>NI-9437<\/strong> is an eight-channel C Series sinking digital input module designed for high-voltage DC monitoring. It supports nominal logic levels from 24 VDC through 240 VDC and maximum field voltages up to 250 VDC.<\/p>\n<p>The module is well suited to railway, electrical power, industrial and automotive applications where conventional 24 V digital input modules do not provide sufficient voltage range. Ratiometric switching thresholds automatically adjust according to the user-supplied field voltage.<\/p>\n<h3>Key Features of the NI-9437<\/h3>\n<ul>\n<li>Eight high-voltage digital input channels<\/li>\n<li>Sinking-input architecture<\/li>\n<li>24 VDC to 250 VDC operating range<\/li>\n<li>Supports 24, 48, 72, 96, 120 and 240 VDC logic systems<\/li>\n<li>Ratiometric input thresholds<\/li>\n<li>Threshold automatically adjusts to approximately two-thirds of Vsup<\/li>\n<li>1 \u00b5s input response<\/li>\n<li>Up to 1 MHz clock rate<\/li>\n<li>Single-ended signaling<\/li>\n<li>250 Vrms channel-to-earth isolation<\/li>\n<li>Spring-terminal and screw-terminal versions<\/li>\n<li>Conformal-coated option<\/li>\n<li>-40\u00b0C to 70\u00b0C operating range<\/li>\n<\/ul>\n<h2>NI-9437 Technical Specifications<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>NI-9437<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>High-voltage C Series digital input module<\/td>\n<\/tr>\n<tr>\n<th>Number of Inputs<\/th>\n<td>8<\/td>\n<\/tr>\n<tr>\n<th>Input Type<\/th>\n<td>Sinking<\/td>\n<\/tr>\n<tr>\n<th>\u0422\u0438\u043f \u0441\u0438\u0433\u043d\u0430\u043b\u0430<\/th>\n<td>Single-ended<\/td>\n<\/tr>\n<tr>\n<th>Input Voltage Range<\/th>\n<td>24 VDC to 250 VDC<\/td>\n<\/tr>\n<tr>\n<th>Nominal Logic Levels<\/th>\n<td>24, 48, 72, 96, 120 and 240 VDC<\/td>\n<\/tr>\n<tr>\n<th>Threshold Type<\/th>\n<td>Ratiometric to field supply<\/td>\n<\/tr>\n<tr>\n<th>Approximate ON Threshold<\/th>\n<td>Two-thirds of user supply voltage<\/td>\n<\/tr>\n<tr>\n<th>Input Response<\/th>\n<td>1 \u043c\u043a\u0441<\/td>\n<\/tr>\n<tr>\n<th>Maximum Clock Rate<\/th>\n<td>1 MHz<\/td>\n<\/tr>\n<tr>\n<th>Channel-to-Channel Isolation<\/th>\n<td>None within the input bank<\/td>\n<\/tr>\n<tr>\n<th>Channel-to-Earth Isolation<\/th>\n<td>250 \u0412 (\u0441\u0440\u0435\u0434\u043d\u0435\u043a\u0432\u0430\u0434\u0440.)<\/td>\n<\/tr>\n<tr>\n<th>Connector Options<\/th>\n<td>Spring terminal or screw terminal<\/td>\n<\/tr>\n<tr>\n<th>Operating Temperature<\/th>\n<td>-40\u00b0C to 70\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>Bus Platform<\/th>\n<td>C Series<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>High-Voltage DC Monitoring<\/h3>\n<p>The NI-9437 allows a CompactDAQ or CompactRIO system to monitor high-voltage control and status signals without using separate voltage-divider circuitry for every channel.<\/p>\n<p>It is intended for properly protected DC signal circuits. Confirm the applicable safety category, working voltage, field wiring and isolation requirements before connection.<\/p>\n<h3>Ratiometric Thresholds<\/h3>\n<p>Instead of applying one fixed voltage threshold to every supported system, the NI-9437 references its input thresholds to the connected user supply. The switching threshold automatically tracks approximately two-thirds of Vsup.<\/p>\n<p>This architecture allows the module to distinguish valid states across several nominal DC control voltages. The field supply and input signal must be configured according to the official wiring diagram.<\/p>\n<h3>1 \u00b5s Digital Response<\/h3>\n<p>The 1 \u00b5s response and 1 MHz clock capability allow the NI-9437 to capture faster state changes than general-purpose high-voltage monitoring devices. Actual acquisition performance depends on the chassis and software interface.<\/p>\n<h2>NI-9437 Part Number and Accessories<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Part Number<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<tr>\n<td>783737-01<\/td>\n<td>Spring-terminal version supplied with NI-9980 terminal plug<\/td>\n<\/tr>\n<tr>\n<td>783393-01<\/td>\n<td>Standard screw-terminal version supplied with NI-9936 plug<\/td>\n<\/tr>\n<tr>\n<td>783393-02<\/td>\n<td>Conformal-coated screw-terminal version<\/td>\n<\/tr>\n<tr>\n<td>NI-9980<\/td>\n<td>10-position spring-terminal plug<\/td>\n<\/tr>\n<tr>\n<td>NI-9936<\/td>\n<td>10-position screw-terminal plug<\/td>\n<\/tr>\n<tr>\n<td>High-Voltage Field Wiring<\/td>\n<td>Application-rated cable selected for voltage, temperature and environment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Confirm whether the application requires spring terminals, screw terminals or conformal coating. All connectors, wire insulation and external protection must be rated for the maximum field voltage.<\/p>\n<h2>NI-9437 Applications<\/h2>\n<ul>\n<li>Railway signal monitoring<\/li>\n<li>Power-system status acquisition<\/li>\n<li>Battery-system testing<\/li>\n<li>High-voltage contact monitoring<\/li>\n<li>Industrial DC control systems<\/li>\n<li>Substation automation<\/li>\n<li>Automotive high-voltage testing<\/li>\n<li>Energy-storage validation<\/li>\n<li>Protective relay monitoring<\/li>\n<li>Hardware-in-the-loop testing<\/li>\n<\/ul>\n<h3>Rail and Power Applications<\/h3>\n<p>Railway and power systems frequently use control voltages above 24 VDC for improved noise immunity and long-distance signaling. The NI-9437 can monitor these circuits directly when all electrical and safety requirements are satisfied.<\/p>\n<h3>Battery and Energy Systems<\/h3>\n<p>The wide DC input range supports status and interlock monitoring in battery and energy-storage test systems. It should not be used as an analog battery-voltage measurement device because it reports digital state rather than precise voltage.<\/p>\n<h2>NI-9437 Installation Workflow<\/h2>\n<h4>Step 1: Identify the Field Voltage<\/h4>\n<p>Confirm the nominal and maximum voltage of the monitored circuit and verify that it remains within the NI-9437 ratings.<\/p>\n<h4>Step 2: Select the Correct Variant<\/h4>\n<p>Choose the appropriate spring-terminal, screw-terminal or conformal-coated model.<\/p>\n<h4>Step 3: De-Energize the Field Circuit<\/h4>\n<p>Remove external power and verify the absence of hazardous voltage before installing or changing wiring.<\/p>\n<h4>Step 4: Connect Vsup and COM<\/h4>\n<p>Connect the field supply reference exactly as shown in the NI wiring documentation because it establishes the ratiometric thresholds.<\/p>\n<h4>Step 5: Connect the Inputs<\/h4>\n<p>Use correctly rated wire, insulation, ferrules, fusing and protective barriers for the field voltage.<\/p>\n<h4>Step 6: Verify the Logic States<\/h4>\n<p>Apply controlled test voltages and confirm that each input changes state at the expected threshold before connecting the production circuit.<\/p>\n<h2>NI-9437 Troubleshooting<\/h2>\n<h4>Every input remains OFF<\/h4>\n<p>Check the Vsup and COM connections. Without the correct field-supply reference, the ratiometric input thresholds cannot operate correctly.<\/p>\n<h4>The input switches at an unexpected voltage<\/h4>\n<p>Measure the actual Vsup value and remember that the threshold tracks the user supply rather than using one fixed voltage for every application.<\/p>\n<h4>The input changes when nearby contactors switch<\/h4>\n<p>Improve cable separation, shielding, grounding and transient suppression. High-voltage industrial wiring can couple noise into long parallel signal cables.<\/p>\n<h4>The software misses narrow pulses<\/h4>\n<p>Confirm the pulse width, selected chassis and acquisition method. The module\u2019s electrical response is only one part of the complete system timing.<\/p>\n<h4>The module is damaged after rewiring<\/h4>\n<p>Always de-energize the external high-voltage circuit before removing the terminal plug or C Series module. Verify polarity and maximum voltage before restoration.<\/p>\n<h2>NI-9437 Comparison<\/h2>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>Input Configuration<\/th>\n<th>Best Suited For<\/th>\n<\/tr>\n<tr>\n<td>NI-9437<\/td>\n<td>8 sinking inputs, 24 VDC to 250 VDC, 1 \u00b5s<\/td>\n<td>High-voltage DC status monitoring<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pxisource.com\/ru\/product\/ni-9421\/\">NI-9421<\/a><\/td>\n<td>8 sinking inputs, 24 V, 100 \u00b5s<\/td>\n<td>General industrial logic<\/td>\n<\/tr>\n<tr>\n<td>NI-9423<\/td>\n<td>8 high-speed 24 V inputs<\/td>\n<td>Fast conventional industrial signals<\/td>\n<\/tr>\n<tr>\n<td>NI-9425<\/td>\n<td>32 sinking inputs<\/td>\n<td>High-channel-count 24 V monitoring<\/td>\n<\/tr>\n<tr>\n<td>NI-9350<\/td>\n<td>Functional-safety-related digital I\/O<\/td>\n<td>Applications requiring applicable safety functionality<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Selecting the NI-9437<\/h3>\n<p>Choose the NI-9437 when the test or monitoring system must read DC logic signals substantially above 30 V. Choose the NI-9421 or NI-9423 for conventional 24 V systems where high-voltage capability is unnecessary.<\/p>\n<h2>NI-9437 Frequently Asked Questions<\/h2>\n<h4>What voltage range does the NI-9437 support?<\/h4>\n<p>It is intended for high-voltage digital signals from 24 VDC to 250 VDC.<\/p>\n<h4>How many inputs does it provide?<\/h4>\n<p>The module provides eight sinking digital input channels.<\/p>\n<h4>Is it an analog voltage measurement module?<\/h4>\n<p>No. It determines digital ON and OFF states and does not provide a precision numeric voltage measurement.<\/p>\n<h4>How are its logic thresholds determined?<\/h4>\n<p>The thresholds are ratiometric and track the connected user supply, with the operating threshold approximately two-thirds of Vsup.<\/p>\n<h4>Is a conformal-coated version available?<\/h4>\n<p>Yes. Part number 783393-02 is the conformal-coated screw-terminal version.<\/p>\n<h4>Can it be used in CompactDAQ and CompactRIO?<\/h4>\n<p>Yes, subject to the compatibility and software capabilities of the selected chassis.<\/p>\n<h3>Request a Quote for the NI-9437<\/h3>\n<p>Contact us for current availability, lead time and project pricing for the <strong>NI-9437 high-voltage digital input module<\/strong>. We can also help select the correct terminal version, compatible chassis and lower-voltage C Series alternatives.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0434\u0432\u0443\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043a\u0430\u043d\u0430\u043b\u043e\u0432: 0<br \/>\n\u041d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u0442\u043e\u043a\u0430: \u0412\u0445\u043e\u0434\u044f\u0449\u0438\u0439 \u043f\u043e\u0442\u043e\u043a<br \/>\n\u0412 \u043a\u043e\u043c\u043f\u043b\u0435\u043a\u0442 \u0432\u0445\u043e\u0434\u0438\u0442: \u0414\u0430<br \/>\nDigital I\/O Logic Levels: 120 VDC, 24 V, 240 VDC, 48 V, 72 V, 96 V<br \/>\n\u0426\u0438\u0444\u0440\u043e\u0432\u0430\u044f \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044f \u0432\u0445\u043e\u0434\u043e\u0432\/\u0432\u044b\u0445\u043e\u0434\u043e\u0432: \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044f 250 \u0412 (\u0441\u0440\u0435\u0434\u043d\u0435\u043a\u0432\u0430\u0434\u0440.) \u043c\u0435\u0436\u0434\u0443 \u043a\u0430\u043d\u0430\u043b\u0430\u043c\u0438 \u0438 \u0437\u0435\u043c\u043b\u0435\u0439<br \/>\n\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0442\u043e\u043b\u044c\u043a\u043e \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430: 8<br \/>\n\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0442\u043e\u043b\u044c\u043a\u043e \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0433\u043e \u0432\u044b\u0432\u043e\u0434\u0430: 0<br \/>\n\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u0430\u044f \u0447\u0430\u0441\u0442\u043e\u0442\u0430 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f: 1 \u043c\u043a\u0441<br \/>\n\u041f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u0430\u044f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u0430\u044f \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430: \u0421\u0435\u0440\u0438\u044f C<\/p>","protected":false},"featured_media":34968,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[673],"product_tag":[],"class_list":["post-34974","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-c-module","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI-9437 C Series Digital Module 783393-02 In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The NI-9437 monitors eight high-voltage DC inputs from 24 VDC to 250 VDC with 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