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You can expand any or all of the PCL-818L's A/D input channels with
multiplexing daughterboards. Most daughterboards require the
PCLD-774 Analog Expansion Board or the PCLD-8115 Screw
Terminal Board for connections.
The PCLD-789 Amplifier and Multiplexer multiplexes 16 differential
inputs to one A/D input channel. You can cascade up to eight PCLD-
789s to the PCL-818L for a total of 128 channels. See the PCLD-779
user's manual for complete operating instructions.
The PCLD-774 Analog Expansion Board accommodates multiple
external signal-conditioning daughterboards, such as PCLD-779 and
PCLD-789. It features five sets of on-board 20-pin header connectors.
A special 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 which let you
directly measure thermocouples with your PCL-818L. You can handle
all types of thermocouples with software compensation and lineariza-
tion.
Special circuit pads on the PCLD-8115 accommodate passive signal
conditioning components. You can easily implement a low-pass filter,
attenuator or current shunt by adding resistors and capacitors.
24
PCL-818L User's Manual
+
Vs
-
_
+
Vcm
HIGH
+
+
Vin
-
LOW
-
GND
Vin=Vs+Vcm
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