PCLD-789D Amplifier and Multiplexer Board Features ƒ Multiplexes 16 differential inputs to one A/D input ƒ Expands a PC-LabCard™ product’s analog inputs to 128 channels ƒ High-grade instrumentation amplifier provides switch selectable gains of 1, 2, 10, 50, 100, 200, 1,000 ƒ Onboard cold-junction compensation circuits for direct thermocouple measurement ƒ Built-in signal conditioning functions include filter, attenuator and current shunt ƒ Second connectors onboard allow daisy chaining ƒ Screw-clamp terminal blocks permit easy and reliable connections Introduction PCLD-789D is a front-end signal conditioning and channel multiplexing daughterboard for use with PC-LabCard™ product’s analog input ports. It multiplexes 16 differential input channels into a single A/D converter input channel. You can cascade up to ten PCLD-789Ds, allowing a single data acquisition card to access 160 analog input channels. PCLD-789D has DB37 and 20-pin flat cable connectors and lets your PCL-818L or PCL-818HD access up to 128 channels without using an additional digital output cable to select channels. The PCLD-789D uses a high-grade instrumentation amplifier that provides switch-selectable gains of 1, 2, 10, 50, 100, 200 and 1,000. This amplifier lets you accurately measure low-level signals with your PC-LabCard™ product. The board also contains a cold-junction sensing circuit that allows direct temperature measurement from thermocouple transducers. A wide variety of thermocouples are supported with software compensation and linearization. Specifications Pin Assignments I/O ƒ Cold-junction 24.4 mV/°C, 0 V at 0°C Compensation ƒ Input Channels 16 differential ƒ Input Conditions Gains CMRR Nonlinearity Setting Time 1,000 125 dB 0.005% FSR 75 µsec. 100 115 dB 0.005% FSR 15 µsec. 10 105 dB 0.007% FSR 15 µsec. 1 85 dB 0.015% FSR 15 µsec. ƒ Input Range ±10 V max. depending on the selected gain ƒ Output Range ±10 V max. ƒ Overvoltage Protection ±30 V continuous General ƒ Connectors Controller: 1 x DB37 male connector 2 x 20-pin box header for daisy chaining I/O: Screw terminals ƒ Dimensions (L x W) 205 x 114 mm (8.1" x 4.5") ƒ Mounting 4 x screw holes for flat surface mounting ƒ Power Consumption 5 V @ 30 mA max, 12 V @ 80 mA max. Ordering Information ƒ PCLD-789D Amplifier and Multiplexer Board w/ 1m DB37 Cable ƒ PCL-10137-1E DB37 Cable, 1 m ƒ PCL-10137-2E DB37 Cable, 2 m ƒ PCL-10137-3E DB37 Cable, 3 m ƒ PCL-10120-1E 20-pin Flat Cable, 1 m ƒ PCL-10120-2E 20-pin Flat Cable, 2 m Block Diagram Signal Conditioning Modules and Terminal Boards All product specifications are subject to change without notice Last updated : 19-Mar-2014