{"id":35912,"date":"2026-08-31T20:30:22","date_gmt":"2026-08-31T12:30:22","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=35912"},"modified":"2026-08-31T20:30:23","modified_gmt":"2026-08-31T12:30:23","slug":"pxi-6238","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxi-6238\/","title":{"rendered":"PXI-6238"},"content":{"rendered":"<h3>PXI-6238 8-Channel Isolated Current I\/O PXI DAQ Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXI-6238<\/strong> is a bank-isolated M Series PXI multifunction data acquisition module designed for industrial current measurement and control. It provides eight differential analog current inputs, two analog current outputs, six digital inputs, four sourcing digital outputs and two 32-bit counter\/timers.<\/p>\n<p>Each analog input measures signals over a \u00b120 mA range with 16-bit resolution and a maximum aggregate sampling rate of 250 kS\/s. The analog outputs generate programmable current signals over a \u00b120 mA range at update rates up to 500 kS\/s.<\/p>\n<p>The module&#8217;s digital inputs and sourcing outputs are compatible with industrial 24 V signals. Bank isolation helps protect the PXI system from ground-potential differences and electrical noise encountered when connecting field transmitters, encoders, proximity sensors, valves, relays and other industrial equipment.<\/p>\n<h3>Key Features of the PXI-6238<\/h3>\n<ul>\n<li>Eight differential analog current inputs<\/li>\n<li>\u00b120 mA analog input range<\/li>\n<li>16-bit analog input resolution<\/li>\n<li>250 kS\/s maximum aggregate sampling rate<\/li>\n<li>Two programmable analog current outputs<\/li>\n<li>\u00b120 mA analog output range<\/li>\n<li>16-bit analog output resolution<\/li>\n<li>500 kS\/s maximum analog output update rate<\/li>\n<li>Six industrial digital input channels<\/li>\n<li>Four 24 V-compatible sourcing digital outputs<\/li>\n<li>Input\/output bank isolation<\/li>\n<li>Two 32-bit counter\/timers<\/li>\n<li>Digital triggering and programmable timing<\/li>\n<li>Four DMA channels<\/li>\n<li>PXI trigger-bus synchronization<\/li>\n<li>37-pin D-Sub front-panel connector<\/li>\n<li>NI-DAQmx software support<\/li>\n<\/ul>\n<h3>PXI-6238 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXI-6238<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>779624-01<\/td>\n<\/tr>\n<tr>\n<th>Product Family<\/th>\n<td>NI M Series isolated multifunction DAQ<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>Bank-isolated PXI current I\/O module<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Channels<\/th>\n<td>8 differential current inputs<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Resolution<\/th>\n<td>16 bits<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Range<\/th>\n<td>\u00b120 \u043c\u0410<\/td>\n<\/tr>\n<tr>\n<th>Maximum Analog Input Sample Rate<\/th>\n<td>250 kS\/s aggregate<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Coupling<\/th>\n<td>DC<\/td>\n<\/tr>\n<tr>\n<th>Typical Analog Input Impedance<\/th>\n<td>92 \u03a9 in parallel with 100 pF<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Bandwidth<\/th>\n<td>700 kHz typical<\/td>\n<\/tr>\n<tr>\n<th>Analog Input FIFO<\/th>\n<td>4,095 samples<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Channels<\/th>\n<td>2 current outputs<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Resolution<\/th>\n<td>16 bits<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Range<\/th>\n<td>\u00b120 \u043c\u0410<\/td>\n<\/tr>\n<tr>\n<th>Maximum Analog Output Update Rate<\/th>\n<td>500 kS\/s<\/td>\n<\/tr>\n<tr>\n<th>Digital Inputs<\/th>\n<td>6 channels<\/td>\n<\/tr>\n<tr>\n<th>Digital Outputs<\/th>\n<td>4 sourcing channels<\/td>\n<\/tr>\n<tr>\n<th>Digital Signal Compatibility<\/th>\n<td>Industrial 24 V signals<\/td>\n<\/tr>\n<tr>\n<th>Counters\/Timers<\/th>\n<td>2 \u00d7 32-bit<\/td>\n<\/tr>\n<tr>\n<th>Isolation Architecture<\/th>\n<td>Analog input\/output and digital bank isolation<\/td>\n<\/tr>\n<tr>\n<th>Continuous Isolation<\/th>\n<td>Up to 60 VDC or 42.4 Vpk<\/td>\n<\/tr>\n<tr>\n<th>Data Transfers<\/th>\n<td>DMA and programmed I\/O<\/td>\n<\/tr>\n<tr>\n<th>DMA Channels<\/th>\n<td>4<\/td>\n<\/tr>\n<tr>\n<th>Front-Panel Connector<\/th>\n<td>37-pin D-Sub<\/td>\n<\/tr>\n<tr>\n<th>Module Format<\/th>\n<td>3U, single-slot PXI module<\/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 hybrid compatible<\/td>\n<\/tr>\n<tr>\n<th>Software Driver<\/th>\n<td>\u041d\u0418-DAQmx<\/td>\n<\/tr>\n<tr>\n<th>Availability Status<\/th>\n<td>Discontinued by NI<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-6238 Part Number and Accessories<\/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>PXI-6238<\/td>\n<td>779624-01<\/td>\n<td>Eight-channel isolated current I\/O PXI multifunction DAQ module<\/td>\n<\/tr>\n<tr>\n<td>SH37F-37M Cable<\/td>\n<td>Varies by length<\/td>\n<td>Shielded 37-pin female-to-male D-Sub cable for industrial I\/O connections<\/td>\n<\/tr>\n<tr>\n<td>CB-37F-HVD<\/td>\n<td>Application dependent<\/td>\n<td>37-pin high-voltage terminal block for custom field wiring<\/td>\n<\/tr>\n<tr>\n<td>37-Pin D-Sub Terminal Block<\/td>\n<td>Application dependent<\/td>\n<td>Screw-terminal accessory for connecting transmitters, sensors and loads<\/td>\n<\/tr>\n<tr>\n<td>External 24 VDC Power Supply<\/td>\n<td>Application dependent<\/td>\n<td>Field power for digital inputs, sourcing outputs and connected loads<\/td>\n<\/tr>\n<tr>\n<td>PXI-6239<\/td>\n<td>779626-01<\/td>\n<td>Related isolated current I\/O module with sinking digital outputs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The PXI-6238 uses one 37-pin D-Sub front-panel connector. Select a shielded cable and terminal accessory rated for the maximum field voltage, current and environmental conditions.<\/p>\n<p>The four digital outputs use sourcing architecture and require a suitable external field supply. Confirm power-supply voltage, polarity, common connection and available current before wiring the output bank.<\/p>\n<h3>Industrial Current I\/O Architecture<\/h3>\n<p>The PXI-6238 is designed specifically for current-based industrial measurement and control. Unlike general-purpose voltage DAQ modules, it can directly measure and generate current signals within its \u00b120 mA range.<\/p>\n<p>This architecture is useful for connecting process transmitters, control loops, current-commanded actuators and other equipment that represents measurements or setpoints as current rather than voltage.<\/p>\n<p>The module supports both positive and negative current. When connecting conventional 4\u201320 mA devices, verify whether the transmitter is loop-powered, self-powered, sourcing or sinking and design the external loop accordingly.<\/p>\n<h3>Eight Differential Current Inputs<\/h3>\n<p>The PXI-6238 provides eight independently measurable differential current inputs. Each channel measures the current passing between its positive and negative input terminals.<\/p>\n<p>Differential measurement improves noise rejection and avoids routing the measurement solely through the PXI chassis ground. However, the channels share their assigned isolated analog input bank rather than providing individual channel-to-channel isolation.<\/p>\n<p>Current must remain within the specified input and working-voltage limits. Use appropriate external protection when the connected circuit can deliver excessive fault current.<\/p>\n<h3>\u00b120 mA Analog Input Range<\/h3>\n<p>Each analog input has a fixed \u00b120 mA measurement range. This supports bipolar current signals as well as common unipolar industrial ranges such as 0\u201320 mA and 4\u201320 mA.<\/p>\n<p>A 4\u201320 mA signal can be converted to engineering units in software. For example, a pressure transmitter&#8217;s 4 mA value can represent the minimum calibrated pressure and 20 mA can represent full scale.<\/p>\n<p>Values below 4 mA or above 20 mA may be used by some instruments to indicate underrange, overrange or wiring faults. Consult the connected transmitter&#8217;s documentation before defining alarm thresholds.<\/p>\n<h3>16-Bit Current Measurement<\/h3>\n<p>The analog-to-digital converter provides 16-bit resolution across the \u00b120 mA input span. This supports detailed measurement of changing current signals in test, monitoring and control applications.<\/p>\n<p>Final measurement uncertainty depends on gain, offset, noise, calibration, temperature and external wiring. Resolution alone does not define the complete accuracy of a current measurement.<\/p>\n<h3>250 kS\/s Aggregate Sampling<\/h3>\n<p>The PXI-6238 can acquire analog current data at an aggregate rate up to 250 kS\/s. The module uses a multiplexed ADC, so the available conversion rate is shared by the channels included in the scan list.<\/p>\n<p>If all eight channels are sampled at equal intervals, the maximum average rate is approximately 31.25 kS\/s per channel. Slower rates are normally sufficient for process transmitters, flow sensors and other industrial current-loop devices.<\/p>\n<p>The high maximum rate also permits capture of faster current transients during device validation, actuator testing and fault analysis.<\/p>\n<h3>Two Programmable Current Outputs<\/h3>\n<p>The PXI-6238 includes two 16-bit analog current outputs. These channels can generate programmable signals across a \u00b120 mA range for controlling or simulating industrial equipment.<\/p>\n<p>Applications include simulating a 4\u201320 mA transmitter, commanding a current-controlled valve, generating a setpoint for a process controller and validating the current input of a device under test.<\/p>\n<p>The connected load and external loop must allow the output to maintain the commanded current within its compliance-voltage limits. Excessive load resistance or incorrect loop wiring can cause the output to saturate.<\/p>\n<h3>500 kS\/s Analog Output Update Rate<\/h3>\n<p>The analog outputs support update rates up to 500 kS\/s. This allows the module to produce static setpoints, stepped profiles and dynamically changing current waveforms.<\/p>\n<p>Actual output behavior depends on load impedance, cable capacitance, compliance voltage and update configuration. Slowly responding industrial actuators may not reproduce the full bandwidth available from the DAQ hardware.<\/p>\n<h3>Bank Isolation<\/h3>\n<p>The PXI-6238 groups related input and output functions into isolated banks. These banks are electrically separated from the PXI system ground, helping reduce ground loops and common-mode interference.<\/p>\n<p>Bank isolation is useful when field equipment operates from a different ground reference than the PXI chassis. It also limits unwanted current flow between industrial wiring and the host system.<\/p>\n<p>Bank isolation is not the same as channel-to-channel isolation. Signals within the same bank may share an isolated reference or supply connection and must remain within their bank working-voltage limits.<\/p>\n<h3>Six Industrial Digital Inputs<\/h3>\n<p>The module provides six digital inputs compatible with industrial 24 V signals. These inputs can monitor switches, proximity sensors, relay contacts, alarm outputs and equipment status lines.<\/p>\n<p>The digital input circuitry interprets industrial voltage levels rather than only standard 5 V TTL logic. Correctly connect the field common and confirm that the external signal remains within the specified input range.<\/p>\n<h3>Four Sourcing Digital Outputs<\/h3>\n<p>The PXI-6238 provides four sourcing digital outputs. A sourcing output supplies positive current from an external field power source to a connected load when the output is active.<\/p>\n<p>Sourcing outputs are commonly used with sinking loads such as industrial relays, indicator lamps, solenoid interfaces and PLC digital inputs. The return side of the load connects to the field-supply common.<\/p>\n<p>The outputs should not be connected to another sourcing device. Verify load polarity, steady-state current and inrush current before energizing an output.<\/p>\n<h3>Sourcing Output Protection<\/h3>\n<p>The digital output circuitry includes protection intended for industrial load switching. External protection may still be required for inductive loads such as relay coils, contactors, valves and solenoids.<\/p>\n<p>Use a flyback diode, transient suppressor or suitable snubber according to the load type and required release speed. Protection components should be installed close to the load whenever practical.<\/p>\n<h3>Two 32-Bit Counter\/Timers<\/h3>\n<p>The PXI-6238 includes two general-purpose 32-bit counter\/timers. They support event counting, frequency measurement, period measurement, pulse-width measurement and pulse generation.<\/p>\n<p>The counters can be used with encoders, flow meters, proximity sensors and other pulse-output devices. Counter input and output signals share the industrial digital interface terminals specified in the module pinout.<\/p>\n<h3>Encoder and Flow-Meter Measurements<\/h3>\n<p>A counter can measure pulses generated by a flow meter and convert the pulse count or frequency into flow rate and accumulated volume. Appropriate scaling is applied in software using the sensor&#8217;s calibration factor.<\/p>\n<p>Position and speed information can also be acquired from supported encoder configurations. Verify signal type, voltage level, reference connection and maximum pulse frequency before connecting the sensor.<\/p>\n<h3>Digital Triggering<\/h3>\n<p>The PXI-6238 supports digital triggering for starting, stopping or synchronizing analog and counter operations. Trigger sources can be routed through external terminals or the PXI trigger bus.<\/p>\n<p>Hardware triggering improves repeatability compared with starting an operation only through software. It is useful when current acquisition must be synchronized with a device state, control output or external event.<\/p>\n<h3>PXI Synchronization<\/h3>\n<p>The module can exchange timing and trigger signals with compatible PXI instruments through the chassis backplane. Multiple modules can therefore coordinate acquisitions and control operations without extensive external trigger wiring.<\/p>\n<p>PXI synchronization is useful when a system combines current I\/O with voltage measurement, switching, waveform generation or digital instruments.<\/p>\n<h3>NI-DAQmx Software Support<\/h3>\n<p>The PXI-6238 is controlled through the NI-DAQmx driver. NI-DAQmx provides functions for channel configuration, timing, triggering, current scaling, waveform generation and counter measurement.<\/p>\n<p>The module can be programmed with LabVIEW, LabWindows\/CVI and compatible C, C++, C# and Python environments. NI Measurement &amp; Automation Explorer can identify the module and provide basic configuration and test functions.<\/p>\n<p>Because the PXI-6238 is a legacy module, verify operating-system and NI-DAQmx compatibility before installing it in a new system.<\/p>\n<h3>Typical PXI-6238 Applications<\/h3>\n<ul>\n<li>4\u201320 mA transmitter measurement<\/li>\n<li>Current-loop simulation<\/li>\n<li>Process-control system testing<\/li>\n<li>Valve and pump control<\/li>\n<li>Relay and solenoid control<\/li>\n<li>Flow-meter measurement<\/li>\n<li>Encoder and proximity-sensor input<\/li>\n<li>Industrial automation testing<\/li>\n<li>PLC I\/O validation<\/li>\n<li>Hardware-in-the-loop testing<\/li>\n<li>Production functional testing<\/li>\n<li>Electrically noisy industrial environments<\/li>\n<\/ul>\n<h3>4\u201320 mA Transmitter Testing<\/h3>\n<p>The PXI-6238 can measure the current produced by pressure, temperature, flow and level transmitters. Test software can convert the acquired current into engineering units and verify accuracy at multiple operating points.<\/p>\n<p>The analog outputs can also simulate transmitter current for testing PLC input modules, process controllers and monitoring systems without connecting the actual sensor.<\/p>\n<h3>PLC Input and Output Validation<\/h3>\n<p>The sourcing digital outputs can apply industrial logic states to compatible sinking PLC inputs. The digital inputs can monitor output states produced by a PLC or another controller.<\/p>\n<p>Analog current generation and measurement allow the same module to test 4\u201320 mA process channels. This combination supports automated verification of mixed analog and digital industrial I\/O.<\/p>\n<h3>Valve and Pump Control<\/h3>\n<p>The analog current outputs can provide command signals to compatible valve positioners, drive controllers and process equipment. Digital outputs can switch relays or control-enable inputs within their electrical ratings.<\/p>\n<p>Safety-critical equipment should include independent interlocks, emergency shutdown circuits and appropriate external protection. Software control through the PXI module should not be the only safety mechanism.<\/p>\n<h3>PXI-6238 Troubleshooting<\/h3>\n<h4>The module is not detected in NI MAX<\/h4>\n<p>Confirm that the PXI-6238 is fully inserted in a compatible PXI or hybrid slot. Check chassis power, controller communication and installation of a compatible NI-DAQmx version, then restart the system.<\/p>\n<h4>A current input always reads zero<\/h4>\n<p>Verify that current actually flows through the positive and negative input terminals. A current input must be wired in series with the external loop rather than connected across the source like a voltage input.<\/p>\n<h4>The measured 4\u201320 mA value is incorrect<\/h4>\n<p>Check input polarity, transmitter power, loop wiring and software scaling. Confirm that the input is configured as a current channel with the correct minimum and maximum values.<\/p>\n<h4>The transmitter does not produce current<\/h4>\n<p>Determine whether the transmitter requires external loop power. Many two-wire 4\u201320 mA transmitters cannot operate without a suitable DC supply connected in series with the measurement loop.<\/p>\n<h4>An analog output cannot reach 20 mA<\/h4>\n<p>Check the total loop resistance and the output compliance-voltage requirement. Excessive resistance, incorrect polarity or an open circuit can prevent the channel from regulating the commanded current.<\/p>\n<h4>A sourcing digital output does not activate the load<\/h4>\n<p>Verify the external field supply, output-bank common, load polarity and return wiring. The connected device must be compatible with a sourcing output and normally behaves as a sinking load.<\/p>\n<h4>The digital input does not detect a signal<\/h4>\n<p>Confirm that the input voltage reaches the required industrial logic threshold relative to the correct digital common. Inspect cable continuity and verify that the external sensor output is wired for the expected sourcing or sinking relationship.<\/p>\n<h4>The module reports noisy current measurements<\/h4>\n<p>Use shielded twisted-pair wiring, separate signal cables from motor and mains wiring and ground the shield according to the system design. Check for ground loops and unstable transmitter power.<\/p>\n<h4>The counter does not detect pulses<\/h4>\n<p>Verify the selected terminal, signal voltage, polarity, reference connection and pulse frequency. Confirm that the counter task is configured for the intended edge, frequency, period or encoder measurement.<\/p>\n<h3>PXI-6238 Comparison with Similar Isolated DAQ Modules<\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>Primary Configuration<\/th>\n<th>Best Suited For<\/th>\n<\/tr>\n<tr>\n<td>PXI-6236<\/td>\n<td>4 current AI, 4 voltage AO, 6 DI and 4 TTL DO<\/td>\n<td>Current measurement with voltage generation<\/td>\n<\/tr>\n<tr>\n<td>PXI-6238<\/td>\n<td>8 current AI, 2 current AO and 4 sourcing DO<\/td>\n<td>Current-loop testing with sourcing load control<\/td>\n<\/tr>\n<tr>\n<td>PXI-6239<\/td>\n<td>8 current AI, 2 current AO and 4 sinking DO<\/td>\n<td>Current-loop testing with sinking load control<\/td>\n<\/tr>\n<tr>\n<td>PXI-6232<\/td>\n<td>16 voltage AI, 2 voltage AO and sourcing DO<\/td>\n<td>Bank-isolated voltage measurement and control<\/td>\n<\/tr>\n<tr>\n<td>PXI-6233<\/td>\n<td>16 voltage AI, 2 voltage AO and sinking DO<\/td>\n<td>Bank-isolated voltage I\/O with sinking outputs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-6238 vs PXI-6239<\/h3>\n<p>The PXI-6238 and PXI-6239 have similar analog current I\/O capabilities. Both provide eight \u00b120 mA analog inputs, two \u00b120 mA analog outputs, six digital inputs and two counters.<\/p>\n<p>The primary difference is their digital output architecture. The PXI-6238 provides sourcing outputs, while the PXI-6239 provides sinking outputs. Select the model that is electrically compatible with the connected load or PLC input.<\/p>\n<h3>PXI-6238 vs PXI-6236<\/h3>\n<p>The PXI-6238 provides eight current inputs and two current outputs. The PXI-6236 combines fewer current inputs with voltage analog outputs and conventional logic-level digital outputs.<\/p>\n<p>Choose the PXI-6238 for direct current-loop measurement and simulation. Select the PXI-6236 when the application requires current acquisition but voltage stimulus generation.<\/p>\n<h3>PXI-6238 vs PXI-6232<\/h3>\n<p>The PXI-6238 is designed for \u00b120 mA analog signals, while the PXI-6232 is designed for voltage-based analog input and output. Both provide bank isolation and sourcing industrial digital outputs.<\/p>\n<p>Select the PXI-6238 for 4\u201320 mA transmitters and current-commanded equipment. Choose the PXI-6232 when the field signals are represented as voltage.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6236\/\">PXI-6236 Isolated Current Input and Voltage Output Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6239\/\">PXI-6239 Isolated Current I\/O Module with Sinking Outputs<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6232\/\">PXI-6232 Isolated Voltage I\/O Module with Sourcing Outputs<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6233\/\">PXI-6233 Isolated Voltage I\/O Module with Sinking Outputs<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/%d0%bf%d0%ba%d1%81%d0%b8-6251\/\">PXI-6251 General-Purpose Multifunction DAQ 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 Isolated Current I\/O Module<\/h3>\n<p>Choose the PXI-6238 when the application requires eight current inputs, two current outputs and four industrial sourcing outputs. It is well suited to 4\u201320 mA process loops and devices that require a source-type digital control signal.<\/p>\n<p>Select the PXI-6239 when sinking digital outputs are required. Consider the PXI-6236 when current measurement must be combined with voltage output, or the PXI-6232 and PXI-6233 for voltage-based analog systems.<\/p>\n<h3>Why Choose the PXI-6238?<\/h3>\n<ul>\n<li>Measures eight differential \u00b120 mA signals<\/li>\n<li>Supports common 0\u201320 mA and 4\u201320 mA devices<\/li>\n<li>Generates two programmable current signals<\/li>\n<li>Provides 16-bit analog input and output resolution<\/li>\n<li>Supports acquisition rates up to 250 kS\/s<\/li>\n<li>Includes six industrial digital inputs<\/li>\n<li>Provides four 24 V-compatible sourcing outputs<\/li>\n<li>Reduces ground-loop problems through bank isolation<\/li>\n<li>Includes two 32-bit counter\/timers<\/li>\n<li>Integrates with NI-DAQmx and LabVIEW<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the PXI-6238?<\/h4>\n<p>The PXI-6238 is a bank-isolated M Series PXI multifunction DAQ module designed for industrial current measurement, current generation and 24 V digital control.<\/p>\n<h4>What is the PXI-6238 part number?<\/h4>\n<p>The standard NI part number for the PXI-6238 is <strong>779624-01<\/strong>.<\/p>\n<h4>How many analog inputs does it provide?<\/h4>\n<p>The module provides eight differential current input channels with a fixed \u00b120 mA measurement range.<\/p>\n<h4>Can it measure 4\u201320 mA transmitters?<\/h4>\n<p>Yes. The \u00b120 mA input range supports common 4\u201320 mA industrial transmitters, provided the external current loop is wired and powered correctly.<\/p>\n<h4>Does the module provide analog outputs?<\/h4>\n<p>Yes. It has two 16-bit current outputs that can generate signals across a \u00b120 mA range at update rates up to 500 kS\/s.<\/p>\n<h4>What is the maximum analog input sampling rate?<\/h4>\n<p>The maximum aggregate analog input sampling rate is 250 kS\/s. This rate is shared across the channels in a multichannel scan.<\/p>\n<h4>Does the PXI-6238 provide isolated channels?<\/h4>\n<p>It provides bank isolation between groups of I\/O and the PXI system. It does not provide independent channel-to-channel isolation for every analog input.<\/p>\n<h4>Are the digital outputs sourcing or sinking?<\/h4>\n<p>The PXI-6238 has four sourcing digital outputs. The related PXI-6239 uses sinking digital outputs.<\/p>\n<h4>Which connector does the module use?<\/h4>\n<p>The PXI-6238 uses a 37-pin D-Sub front-panel connector for its analog, digital, counter and field-power connections.<\/p>\n<h4>Which software controls the PXI-6238?<\/h4>\n<p>The module is controlled through NI-DAQmx and can be programmed using LabVIEW, LabWindows\/CVI and compatible text-based environments.<\/p>\n<h4>Is the PXI-6238 still manufactured?<\/h4>\n<p>The PXI-6238 is a discontinued legacy module. Used and surplus units may remain available for maintaining existing industrial PXI systems.<\/p>\n<h3>Request a Quote for the PXI-6238<\/h3>\n<p>Contact us for current availability, condition, lead time and project pricing for the <strong>PXI-6238 8-Channel Isolated Current I\/O PXI DAQ Module<\/strong>. We can also help identify compatible 37-pin cables, terminal blocks, field power supplies and related NI isolated DAQ modules.<\/p>","protected":false},"excerpt":{"rendered":"<p>PXI-6238 8-Channel Isolated Current I\/O PXI DAQ Module The PXI-6238 is a bank-isolated M Series PXI multifunction data acquisition module<\/p>","protected":false},"featured_media":31255,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-35912","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","first","instock","shipping-taxable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PXI-6238 PXI Multifunction I\/O Module 779624-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The 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