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National Instruments 778725-01 PXI Synchronization Module. 

The part number 778725-01 from National Instruments is the identifying part number for the PXI-6651 PXI Synchronization Module. This synchronization module is designed for PXI chassis enabling the user to synchronize different PXI systems. It uses the trigger bus, star trigger, and system reference clock features of the PXI standard to implement advanced synchronization across multiple devices or chassis. Its CLKIN input features include the input impedance of 50 Ω nominal with an input coupling of AC. It offers a variety of input voltages ranging from 400 mVPP to 5 VPP and an absolute maximum input voltage of  6 VPP. 

Supporting the Phase-Locked Loop PLL capabilities, its uncompensated CLKIN to PXI CLKIN delay is 14 ns to 14.7 ns typically while its PLL compensated delay is ±1 ns, maximum. This module also includes general purpose PFI lines offering a frequency range of DC to 105 MHz with a 50 Ω, nominal input, and output impedance. To operate this module, its power requirements are 2 A, maximum at + 5 V, 600 mA, maximum at +3.3 V, 500 mA, maximum at +12 V, and 0 A, maximum at -12 V.

In terms of structural features, its physical dimensions are 10 cm by 16 cm (3.9 by 6.3 in.) with the ability to install into the PXI Slot 2. It is equipped with an SMB male, 50 Ω front panel connector, and 2 tricolor LEDs on the front panel. This module is designed to work at a suitable temperature of 0 to 55 degrees Celsius and can be stored at an environmental temperature of -20 to 70 degrees Celsius. Its operating humidity is 10% to 90% RH, noncondensing while its storage humidity is 5% to 95% RH, noncondensing.

This module is designed to work under stressful conditions by having an operational shock value of 30 g peak, half-sine, 11 ms pulse, and operating random vibration of 5 to 500 Hz, 0.3 grms with nonoperating random vibration of 5 to 500 Hz, 2.4 grms. This device is made for safety as it complies with many safety standards thus making it reliable and accurate.