Boards Home > Daughter Boards & Accessories - DB-889D
16-channel analog multiplexer board
» Features
■ Connects directly to A-82X, PCI-1800 series DAS board
■ Cold-junction compensation for thermocouples,
thermocouple open detection
■ Input filtering
■ Software-programmable instrumentation amplifier
gain of 0.5, 1, 5, 10, 50, 100,500 and 1000
■ Daisy chain to eight DB-889D
» Functional Description
The DB-889D is an expansion multiplexer / amplifier board for use with A-82X and PCI-1800 series.
Each DB-889D multiplexes 16 differential analog input channels into one analog input of the DAS board.
It provides software programmable gains of 0.5 ,1,5 ,10,50, 100, 500 and 1000.
Thermocouple measurements are handled easily with 889D.
The board includes cold-junction sensing and compensation circuitry that provides a scaling of 24.4mV/°C.
Biasing resistors are included for open thermocouple detection.
The 889D can be cascaded to a total of 128-channel of voltage measurements or 112-channel of thermocouple measurements.
» Applications
● Energy Management
● Signal Conditioning
● Analog Multiplexer
» Specifications
● Accepts thermocouple type : J, K, T, E, S, R, B
● Cold-junction compensation : +24.4 mV/°C( 1°C/bit), 0.0V at 0.0°C
Gain
Common Mode Rejection
Nonlinearity % of FSR
Setting Time
0.5
99dB
±0.0004
23μs
1
99dB
±0.0004
23μs
5
114dB
±0.0004
28μs
10
114dB
±0.0004
28μs
50
123dB
±0.0004
140μs
100
123dB
±0.0004
140μs
500
123dB
±0.0008
1300μs
1000
123dB
±0.0008
1300μs
● Over voltage protection : ± 30V Continuous
● Common mode voltage : ±10V max
● Analog output voltage : ±10V General Specifications
● Power Requirements : +5V@120mA
● Operating temperature : 0°C ~ 60°C
● Operating humidity : 0% ~ 90% non-condensing
● Storage temperature : -20°C ~ 80°C
● Dimensions : 114 mm x 204 mm
Ordering Information Standard DB-889D : 16-channel multiplexer &
signal conditioning board with
CA-3710 & CA-2010 cable Optional CA-2010 : 20-pin flat cable, 1m CA-3720 : 37-pin D-sub cable, 2m
