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National Instruments 785971-01 PXI Express Chassis with Timing and Synchronization Option

The National Instruments 785971-01 (or PXIe-1095) is an 18-slot PXI Express chassis designed for advanced timing and synchronization. It supports PXI, PXI Express, and PXI hybrid modules that ensure versatile module compatibility. The chassis offers both AC and DC power options.

Key electrical specifications of the NI 785971-01 include an AC input range of 100 to 240 VAC at frequencies of 50/60 Hz and 440 Hz along with efficiency rated at 85% typical. The unit features a DC output with maximum currents for various voltage rails: +12V at 122A (dual power), +5V at 21.5A, and +3.3V at 60A. Over-current and over-voltage protections are built-in along with automatic recovery from short circuits and overloads. The NI 785971-01 chassis is equipped with a well-designed cooling system that uses forced air circulation through three 210 CFM fans. The maximum slot cooling capacity is 82W. Air intake occurs from the rear, and exhaust is directed out the top of the chassis. The secondary cooling system also includes a 70 CFM fan.

The 785971-01 unit provides a 10 MHz system reference clock for synchronization along with a maximum slot-to-slot skew of 250 ps and an accuracy of ±25 ppm. With the optional OCXO, accuracy improves to ±80 ppb within one year of calibration. The 100 MHz system reference clock features a maximum slot-to-slot skew of 100 ps and similar OCXO accuracy enhancements. Both clocks exhibit minimal jitter that ensure precise timing for complex test and measurement applications. The chassis includes a rear-panel SMA connector for an external 10 MHz reference with a maximum jitter of 5 ps RMS. System synchronization capabilities are further enhanced by support for PXI Star Trigger and PXI Differential Star Triggers.

Mechanical specifications of 785971-01 chassis detail a reliable construction with dimensions of 6.97 inches in height, 17.54 inches in width, and 18.25 inches in depth. It weighs 35.2 lbs. (single power supply) or 39 lbs. (dual power supplies). The chassis is made from durable materials such as sheet aluminum, extruded aluminum, and cold-rolled steel. The NI 785971-01 chassis is designed for high-altitude operation up to 15,000 feet and features comprehensive safety and electromagnetic compatibility certifications. These include IEC 61010-1, EN 61010-1, and UL 61010-1 for safety, and EN 61326-1 and FCC 47 CFR Part 15B for EMC compliance.