II. Model Interpretation

PXI: Compliant with the PXI bus standard, 3U size, single slot, compatible with PXI/PXIe chassis.

5922: NI's high-precision digital instrument series code, representing Flex II ADC, 24-bit, 6 MHz bandwidth, dual-channel acquisition card.

Component Number: 779153-02 (256 MB / channel), 779153-03 (512 MB / channel) from NI.

III. Technical Parameters (25℃, preheating 10 minutes)

1. Channels and Bandwidth

Number of channels: 2 synchronous sampling

Analog bandwidth: 6 MHz (±0.5 dB)

Input impedance: Software selectable 50 Ω / 1 MΩ from NI

2. Resolution and Sampling Rate (Flex II ADC)

High-precision mode: 24 bits @ ≤ 500 kS/s

High-speed mode: 16 bits @ 15 MS/s

Sampling rate range: 10 S/s to 15 MS/s, software continuously adjustable

3. Input Characteristics

Voltage range: ±5 V (standard), expandable

Coupling mode: AC/DC software selectable

Noise density: -120 dBFS @ 50 kS/s

SFDR: 114 dBc (typical, 100 kHz) from NI

4. Storage and Trigger

On-board memory: 256 MB / channel (standard), 512 MB / channel (optional)

Trigger: Edge, window, pulse, sequence, external trigger; supports PXI trigger bus synchronization

Time base: Internal VCXO, external 10 MHz reference, PXI PLL synchronization

5. Physical and Environmental

Size: 3U, single slot (21.6 cm × 2.0 cm × 13.0 cm)

Operating temperature: 0～55℃; humidity: 10%～90% (no condensation)

Power consumption: Powered by PXI backplane from NI

IV. Interface and Communication Configuration

Front panel (BNC female connector)

CH0/CH1 IN: Analog input, 50 Ω/1 MΩ selectable, AC/DC coupling

TRIG IN/OUT: External trigger input / synchronization output

Indicators: Power, operation, lock, fault from NI

Bus and software

Backplane: PXI mixed bus (PCI, trigger, 10 MHz reference, star trigger)

Driver: NI-5922, supports LabVIEW, TestStand, Python, C#

Synchronization: Multi-module clock / trigger synchronization, supports PXIe system expansion from NI

V. Core Functions

Flex II variable resolution: Seamless switching between 24-bit high-precision (low rate) and 16-bit high-speed (15 MS/s), balancing resolution and bandwidth.

Ultra-high dynamic range: SFDR up to 114 dBc, noise as low as -120 dBFS, suitable for weak signals and large dynamic scenarios from NI.

Dual-channel synchronous sampling: 2 channels sampling simultaneously, high phase synchronization accuracy, meeting differential, comparative measurement requirements.

Flexible input configuration: 50 Ω/1 MΩ impedance, AC/DC coupling, multiple ranges selectable, suitable for sensors, audio, vibration, etc. signals.

Deep storage + stream disk: Maximum 512 MB / channel, supports high-speed data stream disk, suitable for long-term transient recording from NI.

VI. Application Scenarios

Audio and acoustic testing: Microphones, speakers, audio equipment distortion / noise / frequency response measurement from NI.

Vibration and structural analysis: Industrial vibration, modal analysis, impact testing (high-resolution capture of tiny deformations). Precision Voltage and Sensors: Thermocouples, strain bridges, photodiodes, etc. for low-level signal acquisition by NI.

Low-frequency RF and Intermediate Frequency: Signals within 6 MHz IF, IQ acquisition, spectrum analysis (high SFDR to reduce noise) .

Research and Medical: Sonar, ultrasound, bioelectric signals (EEG/ECG), etc. for high-precision measurement by NI.

VII. Installation and Maintenance Instructions

Installation and Power On

Install to a single slot position, with the chassis reliably grounded; preheat for 10 minutes and then perform software self-check.

Keep the air duct unobstructed during operation. The environmental temperature should be ≤ 55℃. Avoid blocking the fan.

For wiring and operation, use 50 Ω BNC cables (50 Ω mode) or high-shielded cables (1 MΩ mode). Avoid wiring in environments with strong interference over long distances.

Input voltage should not exceed ±5 V to prevent front-end overload and damage.

When synchronizing multiple modules, share a 10 MHz reference clock and PXI trigger bus.

Daily Maintenance and Calibration

Perform a traceable calibration once a year to compensate for long-term drift; include built-in self-calibration to correct temperature drift.

Regularly clean the BNC interface. Install a dust cap for long-term inactivity; maintain the environment free of condensation and strong vibrations.

Do not plug or unplug cables while powered on. Interfaces are sensitive to ESD, and perform static protection before operation.