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PCI-1718 Series User Manual 32
Expanding Analog Inputs
You can expand any or all of the PCI-1718HDU/HGU's A/D input chan-
nels using multiplexing daughterboards. Daughterboards without D-type
connectors require the PCLD-774 Analog Expansion Board.
The PCLD-789(D) Amplifier and Multiplexer multiplexes 16 differential
inputs to one A/D input channel. You can cascade up to eight PCLD-
789(D)s to the PCI-1718HDU/HGU for a total of 128 channels. See the
PCLD-789(D) user's manual for complete operating instructions.
The PCLD-774 Analog Expansion Board accommodates multiple exter-
nal signal-conditioning daughter boards, such as PCLD-779 and PCLD-
789(D). It features five sets of on-board 20-pin header connectors. A spe-
cial star-type architecture lets you cascade multiple signal-conditioning
boards without the signal-attenuation and current-loading problems of
normal cascading.
The PCLD-8115 Screw Terminal Board makes wiring connections easy.
It provides 20-pin flat cable and DB-37 cable connectors. It also includes
CJC (Cold Junction Compensation) circuits.
Special circuit pads on the PCLD-8115 accommodate passive signal con-
ditioning components. You can easily implement a low-pass filter, atten-
uator or current shunt by adding resistors and capacitors.