User manual

Signal Conditioning Modules and Terminal Boards
Features
PCLD-8710
PCLD-8712
Introduction
The PCLD-8710 is designed to match multifunction cards with 68-pin SCSI-II connectors, such as the PCI-1710U/UL, PCI-1710HGU, PCI-1711U/UL, PCI-1716/L cards. This screw-
terminal board also includes cold junction sensing circuitry that allows direct measurements from thermocouple transducers. Together with software compensation and linearization,
every thermocouple type can be accommodated. The PCLD-8712 Screw-terminal Board provides convenient and reliable signal wiring for the PCI-1712/L of which has a 68-pin
SCSI-II connector.
Due to its special PCB layout you can install passive components to construct your own signal-conditioning circuits. The user can easily construct a low-pass filter, attenuator or
current shunt converter by adding resistors and capacitors on board’s circuit pads.
Applications
Field wiring for analog and digital I/O channels of PC-LabCard™ products.
Signal conditioning circuits can be implemented as illustrated in the following
examples:
a) Straight-through connection (factory setting)
RAn = 0 : (short)
RBn = none
Cn = none
c) 10 : 1 voltage attenuator:
RAn = 9 K:
RBn = 1 K:
Cn = none
Attenuation =
(Assume source impedance << 10 K:)
d) 4 ~ 20 mA to 1 ~ 5 V
DC
signal converter:
RAn = 0 : (short)
RBn = 250 : (0.1% precision resistor)
Cn = none
Ordering Information
 PCLD-8710 DIN-rail Wiring Terminal Board with CJC Circuit
 PCLD-8712 DIN-rail Wiring Terminal for PCI-1712/L
 PCL-10120-1E 20-pin Flat Cable, 1 m
 PCL-10120-2E 20-pin Flat Cable, 2 m
 PCL-10168-1E 68-pin SCSI Shielded Cable, 1 m
 PCL-10168-2E 68-pin SCSI Shielded Cable, 2 m
b) 1.6 kHz (3 dB) low pass filter
RAn = 10 K:
RBn = none
Cn = 0.01 µF
f3dB =
S
=
PCLD-8710 PCLD-8712
DIN-rail Wiring Terminal Board with CJC Circuit
DIN-rail Wiring Terminal for PCI-1712/L
 Low-cost screw-terminal with 68-pin SCSI-II connector
 Onboard CJC (Cold Junction Compensation) circuits for direct thermocouple
measurement (PCLD-8710)
 Reserved space for signal-conditioning circuits such as low-pass filter,
voltage attenuator and current shunt
 Industrial-grade screw-clamp terminal blocks for heavy-duty and reliable
connections
 DIN-rail mounting case for easy mounting
 Supports PCI-1710U/UL, PCI-1710HGU, PCI-1711U/UL, PCI-1716/L
(PCLD-8710) and PCI-1712/1712L (PCLD-8712)
20-12