Channel & Physical Interface Configuration

• Analog Input Configuration: 32 single-ended or 16 fully differential software-switchable channels, no dedicated analog output channels
• Digital I/O Layout: 48 bidirectional TTL channels divided into 3 ports (Port0:32 lines, Port1/Port2:8 lines each); all pins support independent direction programming
• Front Connectors: Dual 68-pin shielded VHDCI female connectors, matched with SHC68-68-EPM shielded cables
• Form Factor: Standard full-height desktop PCI 32-bit 33 MHz card, PCB dimension 155 × 106 mm, bare weight 99 g
• Front Panel Indicators: Single power status LED, no channel-level activity indicators

Core Analog Input Electrical Parameters

• ADC Performance: 16-bit resolution, guaranteed zero missing codes; maximum integral nonlinearity (INL) ±76 ppm of full scale
• Sampling Timing: Aggregate max 250 kS/s across all channels, 50 ns timing resolution, 50 ppm sampling clock accuracy
• Programmable Input Ranges: ±0.2 V, ±1 V, ±5 V, ±10 V four fixed bipolar ranges
• Input Impedance: >10 GΩ parallel with 100 pF when powered on; 820 Ω passive discharge resistance when powered off
• Overvoltage Protection: ±25 V continuous withstand (power-on), ±15 V continuous withstand (power-off), max 20 mA per-pin input current limit
• Noise & CMRR: 92 dB DC-to-60 Hz common-mode rejection; -75 dB adjacent channel crosstalk at 100 kHz signal input
• Onboard FIFO: 4,095-sample AI hardware FIFO supporting scatter-gather DMA transmission

Absolute Measurement Accuracy (25℃, 1-year calibration cycle)

• ±10 V Range: 3,100 μV full-scale absolute accuracy, 244 μVrms random noise, 75 ppm residual gain error
• ±1 V Range: 360 μV full-scale absolute accuracy, 30 μVrms random noise, 95 ppm residual gain error
• ±0.2 V Range: 112 μV full-scale absolute accuracy, 13 μVrms random noise, 135 ppm residual gain error
• Temperature Drift: 25 ppm/℃ gain temperature coefficient, 57 ppm/℃ offset temperature coefficient for ±10V range
• Settling Time: 7 μs conversion interval for ±1 LSB accuracy on full-scale signal jumps

TTL Digital I/O & PFI Specifications

• Logic Level Standard: 5 V TTL compatible; input low ≤0.8 V, input high ≥2.0 V
• Drive Capability: 24 mA sink / 24 mA source per channel for Port0; 8 mA for Port1/Port2/PFI lines
• PFI Multifunction Lines: 16 programmable PFI pins supporting external trigger, clock input, counter gate and correlated DIO timing
• Correlated DIO: Hardware-timed digital input/output synchronized with AI sampling clock, max 1 MHz toggle frequency
• Power-on Default State: All DIO/PFI pins set to high-impedance input with no internal pull resistors

Dual 32-Bit Counter/Timer Resources

• Counter Structure: Two independent reconfigurable 32-bit up/down counters based on NI TIO ASIC, no shared timing resources
• Max Input Frequency: 80 MHz for external edge counting, 100 MHz internal timebase operation
• Supported Modes: Edge counting, pulse width/duty cycle measurement, quadrature encoder decoding (X1/X2/X4), finite pulse generation
• Trigger & Gating: Software/hardware edge trigger, level gating via PFI external signals

PCI Bus & Synchronization Resources

• Bus Standard: 32-bit 33 MHz conventional PCI 2.2 specification, 132 MB/s theoretical peak bandwidth
• Data Transmission Modes: Scatter-gather DMA, interrupt-driven I/O, programmed I/O; DMA for zero-CPU continuous streaming
• RTSI Synchronization: 8-channel RTSI trigger bus for cross-device synchronization with PCI-4462, PCI-6527 and other NI PCI peripherals
• Power Consumption: 2.8 W typical, 4.2 W peak under full AI+DIO concurrent operation; powered entirely by PCI slot +5 V rail

Mechanical & Environmental Specifications

• Operating Temperature: 0 ℃ ~ +55 ℃; Storage Temperature: -20 ℃ ~ +70 ℃
• Humidity: 10%–90% non-condensing operation, 5%–95% non-condensing storage
• Safety Rating: IEC 61010-1 Measurement Category I, Pollution Degree 2, max operating altitude 2000 m
• EMC Compliance: CE, FCC Class A industrial electromagnetic certification, indoor use only
• Calibration Requirement: 15-minute warm-up before precision measurement, 1-year external traceable calibration cycle

Compatibility Matching List

• Host Compatibility: Standard desktop PC with vacant 32-bit PCI slot; incompatible with PCIe-only motherboards
• Matching Accessories: SHC68-68-EPM shielded cable, CB-68LP breakout terminal block, RTSI trigger ribbon cable
• Peer Device Matching: Synchronizable with legacy NI PCI serial, dynamic signal and counter modules via RTSI
• Official Status: Fully obsolete, no official new stock, only aftermarket inventory and third-party repair available

Software Compatibility

• Drivers: NI-DAQmx 9.9 and earlier versions, Traditional NI-DAQ legacy driver dual support
• Configuration Tools: NI MAX, DAQ Interactive Panel, Signal Express
• Supported Software: LabVIEW all legacy versions, LabWindows/CVI, Python PyDAQmx, C# DAQ SDK
• Supported OS: Windows XP/7/10, Phar Lap ETS real-time system; no Windows 11 official driver support

Pros & Limitations

• Pros: High channel density for multi-point analog acquisition, dual independent counters, hardware-timed correlated DIO, RTSI cross-device synchronization, low CPU load via DMA and large onboard FIFO, excellent low-level DC measurement stability
• Limitations: No onboard signal galvanic isolation requiring external terminal blocks, no analog output channels, legacy PCI bus incompatible with modern PCIe hosts, limited to CAT I low-voltage measurement, no built-in filtering circuitry