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National Instruments 778660-01 128 Channel Multiplexer/Matrix Module

The part number 778660-01 from National Instruments is the identifying part number for the PXI-2530 128-channel multiplexer/matrix module. The module has a maximum switching voltage of 60 VDC, 30 VACrms, and CAT I when used in channel-to-channel or channel-to-ground configuration. The maximum current per channel that this module can provide is 0.4 Amperes while the maximum switching power is 10 Watts. 

The Initial DC path resistance is Less than 2 Ω allowing for efficient signal transmission and minimal signal loss. As the device ages or undergoes prolonged use, the DC path resistance may increase, reaching a typical value of 3 ohms or higher by the end of its lifespan. This increase in resistance can impact signal integrity and may require recalibration or replacement of the device. Thermal EMF can introduce unwanted voltage offsets in measurements, so this module keeps it below 50 µV to help ensure accurate and reliable data acquisition.

The 778660-01 multiplexer/matrix module can switch 64 relays at once while it takes approximately 555 microseconds (µs) for the switches to go from deactivated to activated state. The mechanical life of the relays is 1 x 109 cycles, typical, while the electrical life at 10 V, 100 mA is 1 x 108 cycles, typical. 8 input trigger lines from 0 to 7 can be used to control the switching of the relays and the minimum pulse width required to be considered as a trigger control signal is 150ns. 

The module features Reed-type relays that rely on magnetic fields to control the flow of current through a thin metal reed. They are known for their reliability and low contact resistance, making them suitable for various applications, including switching low-level signals in RF and instrumentation systems. The front panel connector of the module is an LFH (Low Force Helix) matrix with 50 rows and 160 positions, utilizing female connectors. LFH connectors are commonly used in high-density applications where space is limited, offering a compact and efficient means of connectivity. The module is designed as a single-slot 3U (3 unit) module compatible with PXI or cPCI (CompactPCI) systems and weighs 266 g (9.4 oz).