{"id":32785,"date":"2026-05-13T15:40:08","date_gmt":"2026-05-13T07:40:08","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=32785"},"modified":"2026-08-30T14:08:53","modified_gmt":"2026-08-30T06:08:53","slug":"pxie-4340","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxie-4340\/","title":{"rendered":"PXIe-4340"},"content":{"rendered":"<h3>PXIe-4340 4-Channel AC LVDT Displacement Input Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXIe-4340<\/strong> is a four-channel PXI Express displacement input module designed for AC LVDT, AC RVDT, resolver and synchro measurements. It combines 24-bit delta-sigma converters, simultaneous sampling, programmable sensor excitation and digital filtering in a single PXI module.<\/p>\n<p>Each channel can independently configure its excitation voltage and frequency, allowing different compatible displacement or position sensors to operate from the same module. The PXIe-4340 supports 4-wire, 5-wire and 6-wire LVDT and RVDT configurations and samples all four channels at up to 25.6 kS\/s per channel.<\/p>\n<h3>Key Features of the PXIe-4340<\/h3>\n<ul>\n<li>Four AC displacement measurement channels<\/li>\n<li>24-bit delta-sigma analog-to-digital converters<\/li>\n<li>25.6 kS\/s maximum sample rate per channel<\/li>\n<li>Simultaneous sampling on all four channels<\/li>\n<li>\u00b17 Vrms analog input range<\/li>\n<li>Supports AC LVDT sensors<\/li>\n<li>Supports AC RVDT sensors<\/li>\n<li>Supports resolver and synchro measurements<\/li>\n<li>Supports 4-wire, 5-wire and 6-wire LVDT\/RVDT wiring<\/li>\n<li>Independent excitation configuration for each channel<\/li>\n<li>1 Vrms to 7 Vrms programmable excitation<\/li>\n<li>0.5 Vrms excitation-voltage increments<\/li>\n<li>400 Hz to 10 kHz programmable excitation frequency<\/li>\n<li>10 Hz excitation-frequency increments<\/li>\n<li>30 mA excitation current drive<\/li>\n<li>Remote-sense excitation support<\/li>\n<li>Open-coil detection<\/li>\n<li>Excitation overcurrent protection<\/li>\n<li>Internal self-calibration<\/li>\n<li>Hardware-timed single-point operation<\/li>\n<li>PXI Express timing and synchronization<\/li>\n<li>NI-DAQmx software support<\/li>\n<\/ul>\n<h3>PXIe-4340 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXIe-4340<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>785068-01<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>PXI Express displacement input module<\/td>\n<\/tr>\n<tr>\n<th>\u041f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0434\u0430\u0442\u0447\u0438\u043a\u0438<\/th>\n<td>AC LVDT, AC RVDT, resolver and synchro<\/td>\n<\/tr>\n<tr>\n<th>Supported LVDT\/RVDT Wiring<\/th>\n<td>4-wire, 5-wire and 6-wire<\/td>\n<\/tr>\n<tr>\n<th>Number of Analog Input Channels<\/th>\n<td>4<\/td>\n<\/tr>\n<tr>\n<th>ADC Resolution<\/th>\n<td>24 bits<\/td>\n<\/tr>\n<tr>\n<th>ADC Type<\/th>\n<td>Delta-sigma<\/td>\n<\/tr>\n<tr>\n<th>Sampling Architecture<\/th>\n<td>\u0421\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0439<\/td>\n<\/tr>\n<tr>\n<th>Sample-Rate Range<\/th>\n<td>1 S\/s to 25.6 kS\/s per channel<\/td>\n<\/tr>\n<tr>\n<th>Maximum Sample Rate<\/th>\n<td>25,6 \u0442\u044b\u0441. \u043e\u0442\u0441\u0447\u0435\u0442\u043e\u0432\/\u0441 \u043d\u0430 \u043a\u0430\u043d\u0430\u043b<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Range<\/th>\n<td>\u00b17 Vrms<\/td>\n<\/tr>\n<tr>\n<th>Maximum Working Voltage<\/th>\n<td>4 Vrms, signal plus common mode<\/td>\n<\/tr>\n<tr>\n<th>Differential Input Impedance<\/th>\n<td>200 k\u03a9<\/td>\n<\/tr>\n<tr>\n<th>Linearity<\/th>\n<td>0.01%<\/td>\n<\/tr>\n<tr>\n<th>Crosstalk<\/th>\n<td>-100 dB<\/td>\n<\/tr>\n<tr>\n<th>Input Protection<\/th>\n<td>\u00b130 V<\/td>\n<\/tr>\n<tr>\n<th>FIFO Buffer<\/th>\n<td>1,023 samples<\/td>\n<\/tr>\n<tr>\n<th>Data Transfers<\/th>\n<td>DMA and programmed I\/O<\/td>\n<\/tr>\n<tr>\n<th>Excitation Type<\/th>\n<td>Balanced constant differential voltage<\/td>\n<\/tr>\n<tr>\n<th>Excitation Configuration<\/th>\n<td>Software selectable per channel<\/td>\n<\/tr>\n<tr>\n<th>Excitation Voltage Range<\/th>\n<td>1 \u0412 \u044d\u0444\u0444. \u0434\u043e 7 \u0412 \u044d\u0444\u0444.<\/td>\n<\/tr>\n<tr>\n<th>Excitation Voltage Resolution<\/th>\n<td>0.5 Vrms<\/td>\n<\/tr>\n<tr>\n<th>Excitation Frequency Range<\/th>\n<td>400 \u0413\u0446 \u0434\u043e 10 \u043a\u0413\u0446<\/td>\n<\/tr>\n<tr>\n<th>Excitation Frequency Resolution<\/th>\n<td>10 Hz<\/td>\n<\/tr>\n<tr>\n<th>Excitation Current Drive<\/th>\n<td>30 mA<\/td>\n<\/tr>\n<tr>\n<th>Excitation Output Impedance<\/th>\n<td>3 \u03a9<\/td>\n<\/tr>\n<tr>\n<th>Maximum Excitation Gain Error<\/th>\n<td>5%<\/td>\n<\/tr>\n<tr>\n<th>Maximum Excitation DC Offset<\/th>\n<td>\u00b110 mV<\/td>\n<\/tr>\n<tr>\n<th>Excitation Protection<\/th>\n<td>\u00b130 V<\/td>\n<\/tr>\n<tr>\n<th>Maximum Remote-Sense Lead Drop<\/th>\n<td>10% of configured excitation voltage<\/td>\n<\/tr>\n<tr>\n<th>Open-Coil Detection Time<\/th>\n<td>200 ms<\/td>\n<\/tr>\n<tr>\n<th>Excitation Open-Coil Threshold<\/th>\n<td>Greater than 5 k\u03a9<\/td>\n<\/tr>\n<tr>\n<th>Hardware-Timed Single-Point Rate<\/th>\n<td>1 S\/s to 25.6 kS\/s<\/td>\n<\/tr>\n<tr>\n<th>HWTSP Base Latency<\/th>\n<td>63.68 \u00b5s plus demodulation latency<\/td>\n<\/tr>\n<tr>\n<th>Internal Timebase<\/th>\n<td>100 MHz<\/td>\n<\/tr>\n<tr>\n<th>Internal Timebase Accuracy<\/th>\n<td>\u00b150 ppm<\/td>\n<\/tr>\n<tr>\n<th>Reference Clock Sources<\/th>\n<td>Onboard 100 MHz clock or PXIe_CLK100<\/td>\n<\/tr>\n<tr>\n<th>Terminal Block<\/th>\n<td>TB-4340<\/td>\n<\/tr>\n<tr>\n<th>\u0428\u0438\u043d\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441<\/th>\n<td>PXI Express<\/td>\n<\/tr>\n<tr>\n<th>Operating Temperature<\/th>\n<td>0\u00b0C to 55\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>\u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f<\/th>\n<td>\u041d\u0418-DAQmx<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXIe-4340 Part Number and Terminal Block<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Item<\/th>\n<th>Part Number<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<tr>\n<td>PXIe-4340<\/td>\n<td>785068-01<\/td>\n<td>Four-channel, 24-bit AC LVDT displacement input module<\/td>\n<\/tr>\n<tr>\n<td>TB-4340<\/td>\n<td>784087-01<\/td>\n<td>96-pin female DIN to 42-position screw-terminal front-mount terminal block<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The TB-4340 mounts directly to the front of the PXIe-4340 and provides screw-terminal access for sensor inputs, excitation, remote-sense and related signals. The terminal block supports signals through the module\u2019s 7 Vrms measurement range.<\/p>\n<p>Verify the sensor wiring configuration, coil connections, excitation requirements and cable shielding before connecting an LVDT, RVDT, resolver or synchro.<\/p>\n<h3>Four Simultaneously Sampled Channels<\/h3>\n<p>The PXIe-4340 provides four independent displacement measurement channels. Each channel uses its own 24-bit delta-sigma converter, allowing all four channels to be sampled at the same time.<\/p>\n<p>Simultaneous conversion preserves the timing relationship between multiple position measurements. This is useful when comparing actuator motion, shaft position or mechanical movement across several measurement points.<\/p>\n<h3>24-Bit Delta-Sigma Conversion<\/h3>\n<p>Each input channel uses a 24-bit delta-sigma ADC. This architecture provides high resolution and integrated digital filtering for precision displacement and position measurement.<\/p>\n<p>Effective measurement resolution depends on excitation settings, sensor sensitivity, sample rate, filter bandwidth, electrical noise and mechanical installation. The full nominal ADC resolution should not be interpreted as guaranteed noise-free measurement resolution.<\/p>\n<h3>25.6 kS\/s per Channel<\/h3>\n<p>The module supports sample rates from 1 S\/s to 25.6 kS\/s on every channel. All four channels can operate simultaneously at the maximum rate.<\/p>\n<p>Higher sample rates are useful for observing dynamic position changes and vibration-related displacement. Lower rates provide narrower digital-filter bandwidth for slowly changing measurements.<\/p>\n<h3>\u00b17 Vrms Analog Input Range<\/h3>\n<p>The PXIe-4340 accepts differential sensor signals through an absolute range of \u00b17 Vrms. This range supports the secondary-coil signals produced by many AC-excited displacement sensors.<\/p>\n<p>The maximum signal-plus-common-mode working voltage and input-protection limits must also be observed. Do not rely only on the nominal input range when evaluating sensor faults or wiring transients.<\/p>\n<h3>AC LVDT Measurements<\/h3>\n<p>A linear variable differential transformer produces an AC output related to the position of a movable core. The PXIe-4340 supplies the required primary-coil excitation and demodulates the secondary-coil response into a displacement measurement.<\/p>\n<p>The sensor sensitivity and calibration information are required to convert the electrical ratio into engineering units such as millimeters or inches.<\/p>\n<h3>AC RVDT Measurements<\/h3>\n<p>A rotary variable differential transformer operates on a similar principle to an LVDT but measures angular displacement. The PXIe-4340 can excite compatible AC RVDTs and measure their position-dependent secondary output.<\/p>\n<p>The usable angular range and transfer function depend on the individual RVDT. Configure the scaling according to the manufacturer\u2019s calibration data.<\/p>\n<h3>Resolver Measurements<\/h3>\n<p>Resolvers provide sine and cosine output signals that vary with shaft position. Several PXIe-4340 channels can acquire the required secondary signals while the module supplies compatible excitation.<\/p>\n<p>Angular position can be calculated from the sine and cosine measurements. Resolver applications must consider channel synchronization, wiring, transformation ratio and excitation requirements.<\/p>\n<h3>Synchro Measurements<\/h3>\n<p>The PXIe-4340 can be used with compatible low-voltage synchro signals. Multiple channels acquire the required secondary outputs, while software calculates position from the measured relationships.<\/p>\n<p>Traditional synchro systems may operate at voltages exceeding the module ratings. Use suitable external scaling and isolation when the sensor signal or excitation exceeds the PXIe-4340 specifications.<\/p>\n<h3>4-Wire LVDT and RVDT Support<\/h3>\n<p>In a 4-wire configuration, the sensor uses one primary excitation pair and one secondary output pair. The PXIe-4340 measures the resulting differential secondary signal and demodulates it relative to the excitation.<\/p>\n<p>Verify whether the sensor\u2019s internal secondary-coil arrangement produces an output compatible with the selected four-wire measurement configuration.<\/p>\n<h3>5-Wire LVDT and RVDT Support<\/h3>\n<p>A 5-wire sensor generally provides one excitation pair and three secondary connections, with the secondary coils sharing a common point. The module supports the required measurements and excitation configuration.<\/p>\n<p>Follow the sensor manufacturer\u2019s polarity markings carefully. Reversed secondary connections can invert the reported displacement direction.<\/p>\n<h3>6-Wire LVDT and RVDT Support<\/h3>\n<p>A 6-wire configuration provides separate connections for the primary excitation and both secondary coils. This arrangement gives access to each secondary signal and is common in precision LVDT and RVDT installations.<\/p>\n<p>The PXIe-4340 and TB-4340 provide the connections required to support this configuration. Correct phase and coil identification are essential for valid displacement results.<\/p>\n<h3>Independent Per-Channel Excitation<\/h3>\n<p>Excitation voltage and frequency are configured independently for each channel. Sensors with different excitation requirements can therefore be connected to separate channels of one module.<\/p>\n<p>Independent excitation is also useful when evaluating sensor performance at several frequencies or when replacing an existing signal conditioner that used application-specific settings.<\/p>\n<h3>1 Vrms to 7 Vrms Excitation Voltage<\/h3>\n<p>The excitation voltage can be programmed from 1 Vrms to 7 Vrms in 0.5 Vrms increments. The balanced differential output can drive up to 30 mA within the module\u2019s operating limits.<\/p>\n<p>Use the voltage recommended by the sensor manufacturer. Excessive excitation can cause sensor heating, saturation or measurement error, while insufficient excitation reduces the available output signal.<\/p>\n<h3>400 Hz to 10 kHz Excitation Frequency<\/h3>\n<p>The excitation frequency can be configured from 400 Hz to 10 kHz in 10 Hz increments. This wide range supports many AC LVDT, RVDT, resolver and synchro sensors.<\/p>\n<p>Excitation frequency affects sensor output, phase response, digital-filter bandwidth and measurement latency. Select a value within the sensor\u2019s specified operating range.<\/p>\n<h3>Remote-Sense Excitation<\/h3>\n<p>Remote-sense connections allow the module to monitor the excitation voltage closer to the sensor. This helps compensate for voltage drop in long excitation leads.<\/p>\n<p>The maximum supported remote-sense lead drop is 10% of the configured excitation voltage. Use appropriate cable conductors if sensor current and cable length create a larger voltage drop.<\/p>\n<h3>Open-Coil Detection<\/h3>\n<p>Open-coil diagnostics help detect broken wires, disconnected sensors and open LVDT or RVDT windings. The specified detection time is approximately 200 ms.<\/p>\n<p>Open-coil detection should be interpreted with the selected sensor and wiring configuration. Resolver and synchro systems that share excitation across several channels may report unused excitation connections as open.<\/p>\n<h3>Excitation Overcurrent Protection<\/h3>\n<p>The PXIe-4340 monitors current on the excitation terminals. If an excessive current is detected, an internal relay disables the affected excitation output for approximately one second.<\/p>\n<p>The overcurrent condition is reported to software. Inspect the wiring and sensor coil resistance before restarting the measurement because repeated overloads may indicate a short circuit or incompatible sensor.<\/p>\n<h3>Excitation Overvoltage Protection<\/h3>\n<p>The excitation connections include protection through \u00b130 V. This helps protect the module against certain wiring errors and transients within the specified limit.<\/p>\n<p>External protection may still be required in harsh industrial environments. Keep sensor cables away from high-energy switching circuits and use suitable shielding and grounding.<\/p>\n<h3>Self-Calibration<\/h3>\n<p>Internal self-calibration corrects gain and offset drift without requiring an external calibration source for routine adjustment. Performing self-calibration after the system reaches a stable operating temperature can improve measurement accuracy.<\/p>\n<p>Self-calibration does not replace periodic external calibration. Follow the applicable calibration interval and quality-system requirements for traceable measurements.<\/p>\n<h3>Digital Demodulation and Filtering<\/h3>\n<p>The module digitally demodulates the AC sensor response to determine position. Its filter behavior depends on excitation frequency and configured sample rate.<\/p>\n<p>Higher excitation frequencies provide wider available demodulation bandwidth and shorter latency. Lower excitation frequencies may be required by the sensor but produce a narrower measurement bandwidth.<\/p>\n<h3>Demodulation Bandwidth<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Excitation Frequency<\/th>\n<th>Demodulation Filter -3 dB Bandwidth<\/th>\n<\/tr>\n<tr>\n<td>400 Hz to below 625 Hz<\/td>\n<td>110 Hz<\/td>\n<\/tr>\n<tr>\n<td>625 Hz to below 1.25 kHz<\/td>\n<td>219 Hz<\/td>\n<\/tr>\n<tr>\n<td>1.25 kHz to below 2.5 kHz<\/td>\n<td>438 Hz<\/td>\n<\/tr>\n<tr>\n<td>2.5 kHz to below 5 kHz<\/td>\n<td>876 Hz<\/td>\n<\/tr>\n<tr>\n<td>5 kHz to 10 kHz<\/td>\n<td>1,750 Hz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The final aggregate bandwidth may also be limited by the selected sample rate and additional digital filtering. Confirm the required mechanical signal bandwidth before configuring the excitation and acquisition rates.<\/p>\n<h3>Hardware-Timed Single-Point Operation<\/h3>\n<p>The PXIe-4340 supports hardware-timed single-point acquisition from 1 S\/s to 25.6 kS\/s. This mode is suitable for compatible real-time monitoring and closed-loop control applications.<\/p>\n<p>Total HWTSP latency includes a 63.68 \u00b5s base term plus demodulation latency. Demodulation latency decreases as excitation frequency increases.<\/p>\n<h3>Demodulation Latency<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Excitation Frequency<\/th>\n<th>Demodulation Latency<\/th>\n<\/tr>\n<tr>\n<td>400 Hz to below 625 Hz<\/td>\n<td>9,661.44 \u00b5s<\/td>\n<\/tr>\n<tr>\n<td>625 Hz to below 1.25 kHz<\/td>\n<td>4,787.20 \u00b5s<\/td>\n<\/tr>\n<tr>\n<td>1.25 kHz to below 2.5 kHz<\/td>\n<td>2,350.08 \u00b5s<\/td>\n<\/tr>\n<tr>\n<td>2.5 kHz to below 5 kHz<\/td>\n<td>1,131.52 \u00b5s<\/td>\n<\/tr>\n<tr>\n<td>5 kHz to below 10 kHz<\/td>\n<td>496.64 \u00b5s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>When latency is important, evaluate both the sensor\u2019s supported excitation frequency and the module\u2019s demodulation delay. A higher excitation frequency cannot be used unless the sensor is designed for it.<\/p>\n<h3>PXI Express Synchronization<\/h3>\n<p>The PXIe-4340 can use its onboard 100 MHz clock or the PXI Express PXIe_CLK100 reference. This allows multiple modules and instruments to share a common timebase.<\/p>\n<p>Hardware synchronization is useful when displacement must be correlated with force, strain, temperature, vibration or other measurements in a structural or electromechanical test.<\/p>\n<h3>Analog Reference Triggering<\/h3>\n<p>An analog input channel can be used as a reference-trigger source. Triggering allows a buffered acquisition to capture displacement data before and after a defined position-related event.<\/p>\n<p>Trigger level and signal behavior should be selected with consideration for noise, sensor scaling and the expected direction of movement.<\/p>\n<h3>Typical PXIe-4340 Applications<\/h3>\n<ul>\n<li>Linear displacement measurement<\/li>\n<li>Angular position measurement<\/li>\n<li>AC LVDT sensor acquisition<\/li>\n<li>AC RVDT sensor acquisition<\/li>\n<li>Resolver measurement<\/li>\n<li>Synchro measurement<\/li>\n<li>Actuator position testing<\/li>\n<li>Hydraulic and pneumatic system validation<\/li>\n<li>Aerospace control-surface testing<\/li>\n<li>Automotive component validation<\/li>\n<li>Industrial machinery monitoring<\/li>\n<li>Structural test systems<\/li>\n<li>Production sensor calibration<\/li>\n<li>Closed-loop position monitoring<\/li>\n<\/ul>\n<h3>Hydraulic Actuator Testing<\/h3>\n<p>LVDT sensors are commonly installed inside hydraulic actuators to measure piston or rod position. The PXIe-4340 can excite and acquire these sensors during static, dynamic and endurance testing.<\/p>\n<p>Position data can be synchronized with pressure, force and command signals to evaluate actuator response, hysteresis and mechanical performance.<\/p>\n<h3>Aerospace Position Measurement<\/h3>\n<p>Aerospace systems use LVDTs, RVDTs, resolvers and synchros to monitor control surfaces, valves, actuators and rotating assemblies. The PXIe-4340 provides configurable excitation and precision acquisition for compatible low-voltage sensors.<\/p>\n<p>The complete test system should follow the required aerospace grounding, shielding, calibration and safety procedures.<\/p>\n<h3>Automotive Component Validation<\/h3>\n<p>The module can measure position in steering, braking, suspension and actuator test systems that use compatible AC displacement sensors.<\/p>\n<p>PXI synchronization allows displacement to be correlated with load, current, vibration, CAN communication and controller commands during automated validation.<\/p>\n<h3>Production Sensor Calibration<\/h3>\n<p>A production calibration system can move an LVDT or RVDT through known positions and record the corresponding electrical output. Software can determine sensitivity, linearity, offset and usable measurement range.<\/p>\n<p>Different excitation conditions can be evaluated automatically because voltage and frequency are programmable for each channel.<\/p>\n<h3>NI-DAQmx Software Support<\/h3>\n<p>The PXIe-4340 is controlled through the NI-DAQmx driver. NI-DAQmx provides functions for selecting the sensor type, configuring excitation, setting the acquisition rate, reading displacement data and monitoring diagnostic conditions.<\/p>\n<p>The driver supports LabVIEW and compatible text-based development environments. NI Measurement &amp; Automation Explorer can identify the module and assist with initial hardware configuration.<\/p>\n<h3>FlexLogger Integration<\/h3>\n<p>FlexLogger can be used in compatible systems to configure measurements, visualize displacement channels and record test data without developing a complete custom application.<\/p>\n<p>Confirm that the installed FlexLogger and NI-DAQmx versions support the PXIe-4340 and the required measurement configuration.<\/p>\n<h3>LabVIEW Real-Time Integration<\/h3>\n<p>The PXIe-4340 can operate with a compatible PXI real-time controller for deterministic acquisition and hardware-timed single-point measurements.<\/p>\n<p>Closed-loop applications must account for ADC conversion, demodulation, filtering, software execution and actuator-response latency.<\/p>\n<h3>PXIe-4340 Troubleshooting<\/h3>\n<h4>The PXIe-4340 is not detected in NI MAX<\/h4>\n<p>Confirm that the module is fully installed in a compatible PXI Express slot. Check chassis power, controller communication and NI-DAQmx installation, then restart the system and rescan the hardware.<\/p>\n<h4>The displacement reading does not change<\/h4>\n<p>Check the primary excitation connections, secondary-coil wiring and sensor movement. Confirm that excitation is enabled and that the sensor is compatible with the configured frequency and voltage.<\/p>\n<h4>The displacement direction is reversed<\/h4>\n<p>Reverse the applicable secondary-coil polarity in the wiring or measurement configuration. Verify the sensor manufacturer\u2019s phase and lead-color information before changing connections.<\/p>\n<h4>The module reports an open coil<\/h4>\n<p>Inspect the cable and sensor winding for an open circuit. Confirm the selected 4-wire, 5-wire or 6-wire configuration and account for unused excitation lines in resolver or synchro arrangements.<\/p>\n<h4>The module reports excitation overcurrent<\/h4>\n<p>Disconnect the sensor and measure its primary-coil resistance. Check for shorted wiring, excessive excitation voltage or an incompatible sensor. The module temporarily disables excitation after detecting overcurrent.<\/p>\n<h4>The measurement is noisy<\/h4>\n<p>Check cable shielding, grounding, sensor mounting and excitation settings. Reduce the sample rate when narrower digital-filter bandwidth is acceptable.<\/p>\n<h4>The measurement changes with cable length<\/h4>\n<p>Use the remote-sense connections to compensate for excitation-lead voltage drop. Verify that the lead drop remains within 10% of the configured excitation voltage.<\/p>\n<h4>The sensor output is clipped<\/h4>\n<p>Confirm that the secondary output remains within \u00b17 Vrms across the complete displacement range. Reduce excitation if the sensor output exceeds the module\u2019s input range.<\/p>\n<h4>The response is slower than expected<\/h4>\n<p>Review the excitation frequency, demodulation latency and digital-filter bandwidth. Lower excitation frequencies create longer demodulation delays.<\/p>\n<h4>Two channels show different phase or delay<\/h4>\n<p>Confirm that both channels use the intended excitation and sample configurations. Use PXI synchronization and account for any sensor-specific phase differences.<\/p>\n<h3>PXIe-4340 Comparison with Related Sensor Modules<\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>Primary Measurement<\/th>\n<th>Best Suited For<\/th>\n<\/tr>\n<tr>\n<td>PXIe-4340<\/td>\n<td>AC LVDT, RVDT, resolver and synchro<\/td>\n<td>Direct AC displacement and angular-position measurements<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4330<\/td>\n<td>Strain and bridge-based sensors<\/td>\n<td>Load cells, strain gauges and bridge transducers<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4331<\/td>\n<td>High-speed strain and bridge measurements<\/td>\n<td>Dynamic structural and load measurements<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4339<\/td>\n<td>High-accuracy bridge and voltage measurements<\/td>\n<td>Precision bridge sensors and wide input ranges<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4353<\/td>\n<td>Thermocouple temperature<\/td>\n<td>High-channel-count temperature measurements<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4357<\/td>\n<td>RTD temperature<\/td>\n<td>Precision resistance-temperature measurements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXIe-4340 vs PXIe-4330<\/h3>\n<p>The PXIe-4340 is designed specifically for AC-excited displacement and position sensors such as LVDTs and RVDTs. The PXIe-4330 is designed for strain gauges, load cells and other bridge-based sensors.<\/p>\n<p>Choose the PXIe-4340 when the sensor requires AC excitation and demodulation. Select the PXIe-4330 when the transducer uses a resistive Wheatstone-bridge configuration.<\/p>\n<h3>PXIe-4340 vs General Analog Input Modules<\/h3>\n<p>A general analog input module can acquire an LVDT secondary voltage only when external excitation, demodulation and signal conditioning are provided. The PXIe-4340 integrates these functions directly.<\/p>\n<p>Select the PXIe-4340 when programmable AC excitation, remote sensing, demodulation and sensor diagnostics are required. A general analog input module may be suitable when an external LVDT conditioner already provides a standard DC voltage output.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4330\/\">PXIe-4330 Strain and Bridge Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4331\/\">PXIe-4331 High-Speed Strain and Bridge Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4339\/\">PXIe-4339 Bridge and Voltage Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4353\/\">PXIe-4353 Thermocouple Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4357\/\">PXIe-4357 RTD Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/%d0%bc%d0%be%d0%b4%d1%83%d0%bb%d0%b8-pxi\/\">View More NI PXI and PXI Express Modules<\/a><\/li>\n<\/ul>\n<h3>Selecting the Right Displacement Measurement Module<\/h3>\n<p>Choose the PXIe-4340 when the application uses an AC LVDT, AC RVDT, resolver or synchro with excitation requirements between 1 Vrms and 7 Vrms and 400 Hz to 10 kHz.<\/p>\n<p>Before ordering, confirm the sensor wiring, primary-coil current, secondary output level, excitation voltage, excitation frequency, number of required measurement channels and TB-4340 terminal-block requirement.<\/p>\n<h3>Why Choose the PXIe-4340?<\/h3>\n<ul>\n<li>Directly supports AC LVDT and RVDT sensors<\/li>\n<li>Supports resolver and synchro measurements<\/li>\n<li>Provides four simultaneously sampled channels<\/li>\n<li>Uses high-resolution 24-bit delta-sigma ADCs<\/li>\n<li>Samples every channel at up to 25.6 kS\/s<\/li>\n<li>Provides independently programmable excitation<\/li>\n<li>Supports 4-wire, 5-wire and 6-wire sensors<\/li>\n<li>Includes remote-sense excitation connections<\/li>\n<li>Detects open coils and excitation overcurrent<\/li>\n<li>Supports self-calibration and PXI synchronization<\/li>\n<li>Integrates with NI-DAQmx and LabVIEW<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the PXIe-4340?<\/h4>\n<p>The PXIe-4340 is a four-channel, 24-bit PXI Express displacement input module for AC LVDT, AC RVDT, resolver and synchro measurements.<\/p>\n<h4>What is the PXIe-4340 part number?<\/h4>\n<p>The standard NI part number for the PXIe-4340 is <strong>785068-01<\/strong>.<\/p>\n<h4>How many analog input channels does it provide?<\/h4>\n<p>The module provides four simultaneously sampled analog input channels.<\/p>\n<h4>What is the maximum sample rate?<\/h4>\n<p>Each channel can sample at up to 25.6 kS\/s, and all four channels can operate simultaneously at that rate.<\/p>\n<h4>What is the ADC resolution?<\/h4>\n<p>The PXIe-4340 uses 24-bit delta-sigma analog-to-digital converters.<\/p>\n<h4>What is the analog input range?<\/h4>\n<p>The absolute analog input range is \u00b17 Vrms.<\/p>\n<h4>Which LVDT wiring configurations are supported?<\/h4>\n<p>The module supports 4-wire, 5-wire and 6-wire AC LVDT and RVDT sensors.<\/p>\n<h4>Can the excitation settings be configured independently?<\/h4>\n<p>Yes. Excitation voltage and frequency can be configured separately for each channel.<\/p>\n<h4>What excitation voltage does it provide?<\/h4>\n<p>Excitation is programmable from 1 Vrms to 7 Vrms in 0.5 Vrms steps.<\/p>\n<h4>What excitation frequencies are supported?<\/h4>\n<p>The frequency is programmable from 400 Hz to 10 kHz in 10 Hz increments.<\/p>\n<h4>What is the maximum excitation current?<\/h4>\n<p>The excitation output can drive up to 30 mA within the specified operating conditions.<\/p>\n<h4>Does the PXIe-4340 support remote sensing?<\/h4>\n<p>Yes. Remote-sense connections can compensate for excitation-voltage drop in sensor leads within the supported limit.<\/p>\n<h4>Can it detect disconnected sensors?<\/h4>\n<p>Yes. Open-coil detection can identify compatible open sensor windings or disconnected wiring.<\/p>\n<h4>Does it provide overcurrent protection?<\/h4>\n<p>Yes. Excitation is temporarily disabled and the condition is reported to software when excessive output current is detected.<\/p>\n<h4>Which terminal block is compatible?<\/h4>\n<p>The compatible front-mount terminal block is the <strong>TB-4340, part number 784087-01<\/strong>.<\/p>\n<h4>Which software controls the PXIe-4340?<\/h4>\n<p>The module uses NI-DAQmx and can be integrated with LabVIEW, LabVIEW Real-Time, FlexLogger and compatible text-based programming environments.<\/p>\n<h3>Request a Quote for the PXIe-4340<\/h3>\n<p>Contact us for current availability, lead time and project pricing for the <strong>PXIe-4340 4-Channel 24-Bit AC LVDT Displacement Input Module<\/strong>. We can also help confirm the TB-4340 terminal block, PXI Express chassis and sensor wiring requirements for your LVDT, RVDT, resolver or synchro measurement system.<\/p>","protected":false},"excerpt":{"rendered":"<p>Supported Hardware Platform: PXI<br \/>\nReconfigurable: \u2014<br \/>\nMaximum Sample Rate: 25.6 kS\/s\/ch<br \/>\nMaximum Analog Update Rate: \u2014<br \/>\nNumber of Analog Input Channels: 4<br \/>\nAnalog Input Voltage Range: 7 Vrms<br \/>\n\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u044b\u0445 \u0432\u044b\u0445\u043e\u0434\u043d\u044b\u0445 \u043a\u0430\u043d\u0430\u043b\u043e\u0432: 0<br \/>\nAnalog Output Voltage Range: \u2014<br \/>\n\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\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0432\u044b\u0431\u043e\u0440\u043a\u0430: \u041d\u0435\u0442<br \/>\nAnalog Input Absolute Accuracy: \u2014<br \/>\nAnalog Input Maximum Absolute Accuracy: \u2014<br \/>\nOperating Temperature Range: 0 \u00b0C to 55 \u00b0C<br \/>\nBus Connection: PXI Express<\/p>","protected":false},"featured_media":32730,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-32785","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","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 PXIe-4340 PXI Displacement Input Module 785068-01, In Stock | Project 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