II. Model Interpretation

PXI: 3U single slot, PXI bus, compatible with PXI/PXIe chassis.

6122: S series synchronous sampling model, 16-bit, 500 kS/s/ch, 4 channels synchronous AI.

Part number: 779179-01 (standard); recommended alternative model: 781053-01NI.

S series: Simultaneous (synchronous sampling), different from E series multiplexing architecture.

III. Technical Parameters (25℃)

1. Analog Input (AI)

Channels: 4 differential (synchronous sampling, no single-ended mode) NI

Resolution: 16 bits (65536 levels)

Sampling rate: 500 kS/s per channel, total 2 MS/s

Range: ±1.25 V, ±2.5 V, ±5 V, ±10 V (software selectable)

Input impedance: 1 MΩ || 20 pF

Coupling: DC coupling; overvoltage protection ±25 V (on power-on) / ±15 V (off power)

FIFO: 16 MB onboard memory, supports DMA continuous acquisition

Anti-aliasing: Built-in low-pass filter, matching sampling rate

2. Digital I/O (DIO)

Channels: 8 bidirectional TTL/CMOS

Level: High ≥ 2.4 V, Low ≤ 0.4 V

Rate: Up to 1 MHz (hardware timing)

3. Counter / Timer

Quantity: 2 24-bit (STC3 chip)

Time base: 100 MHz internal clock

Function: event counting, frequency / period measurement, pulse generation, edge triggering

4. Physical and Environmental

Size: 3U single slot (approx. 22×124×126 mm)

Operating temperature: 0～50℃

Power consumption: approximately 8 W (PXI backplane power supply)

Calibration: recommended once every 2 years for traceable calibration

IV. Interface and Communication Configuration

Front panel interface: 68-pin SCSI-II female connector (with SH68-68-EP cable, CB-68LP wiring box)

Bus: standard PXI (PCI, trigger, 10 MHz reference clock)

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

Synchronization: PXI trigger bus / RTSI, multi-module nanosecond-level synchronization

PFI lines: 8 programmable function inputs for board-to-board / board-to-board triggering and timing routing

V. Core Functions

4 channels full synchronous sampling: independent ADC, no phase difference between channels, suitable for vibration, acoustic, transient signal synchronous acquisition.

16-bit high resolution: high dynamic range, accurately captures small signals and large signals coexisting scenarios.

Medium-high-speed continuous acquisition: 500 kS/s/ch + 16 MB FIFO, supports long-term high-speed disk transfer.

Multifunctional integration: AI + DIO + counter + trigger, one module completes measurement, control, and timing (NI).

Wide range and signal conditioning compatibility: 4 range levels; can be equipped with SCXI/SCC conditioning, suitable for sensor signals.

VI. Application Scenarios

Vibration / modal testing: 4 channels synchronous acquisition, suitable for motor, bearing, small structure vibration analysis.

Acoustic / ultrasonic testing: microphone array, ultrasonic transducer synchronous sampling, used for non-destructive testing, acoustic measurement (NI).

Communication intermediate frequency (IF) digitization: ISDN, ADSL, POTS manufacturing test, high-speed acquisition of intermediate frequency signals (NI).

Transient signal recording: shock, pulse, discharge, etc., short-time high dynamic signal capture (NI). Research and High Energy Physics: Detector Signals, Pulse Synchronous Measurement, Multi-module Expansion Synchronous System NI.

VII. Installation and Maintenance Instructions

Installation and Power On

Disconnect and insert the single slot, ensure the chassis is reliably grounded; after powering on, NI-DAQmx self-checks and preheats for 15 minutes.

Operating Temperature: 0 - 50℃. Keep the air ducts unobstructed and avoid blocking the fans.

Wiring and Operation

Use shielded twisted-pair differential wiring for analog inputs; differential wiring must be selected in strong interference environments.

Input voltage should not exceed ±10 V; avoid frequent plugging and unplugging of the 68-pin interface; it is recommended to use a wiring box.

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

Daily Maintenance and Calibration

It is recommended to conduct a traceable calibration once every 2 years; built-in self-calibration compensates for temperature drift.

Keep the interfaces clean, prevent dust accumulation during long-term inactivity; keep away from strong vibrations, condensation, and strong electromagnetic interference.