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User’s Guide
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OME-DB-889D
16-Channel Analog Multiplexer Board
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OME-DB-889D MULTIPLEXER BOARD .........................................................................................2 1. FUNCTION DESCRIPTION............................................................................................................2 1.1 FEATURES........................................................................................................................................2 1.2 APPLICATIONS ..........................................................................
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OME-DB-889D Multiplexer Board 1. Function Description The OME-DB-889D is an expansion multiplexer / amplifier board for use with OME-A-82X, OME-PCI-1800 series. Each OME-DB-889D multiplexes 16 differential analog input channels into one analog input of the DAS board. The high grade instrumentation provides software programmable gains of 0.5, 1, 5, 10, 50, 100, 500 and 1000. Thermocouple measurements are handled easily with OME-DB-889D. The board includes cold junction sensing and compe
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Gain Common Mode Non linearity %of Settling Time Rejection FSR ±0.0004 0.5 99dB 23uS ±0.0004 1 99dB 23uS 5 114dB ±0.0004 28uS 10 99dB ±0.0004 28uS ±0.0004 50 123dB 140uS ±0.0004 100 123dB 140uS 500 123dB ±0.0008 1300uS 1000 123dB ±0.0008 1300uS Power requirement : +5V@120mA Dimension :114mm X 204mm Operating temperature : 0~60 °C Storage temperature : -20~80 °C Humidity : 5% to 90% non condensing OME-DB-889D User’s Manual 3
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2. Installing 2.1 Layout CJC Output VR1 VR2 JP18 JP19 External Voltage Input Jumper /Connector Function Note Name Connect to A/D connector of OME-A-82x series CN1 Cascaded to another OME-DB-889D CN2 Connect to D/O connector of OME-A-82x series CN3 Cascaded to another OME-DB-889D CN4 External +5V power input CN5 Select by JP19 Analog input channel 0~ channel 15 CN6, CN8 CJC signal output connector CN7 Channel 0 ~ channel 15 R/C filter
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2.2 Jumper setup 2.2.1 JP0 ~ JP15 Analog Input R/C Filter The OME-DB-889D provides R/C filter with each analog input channel by jumper setting. 1.2K Ω Channel 0 High 1uF 50V Channel 0 Low 1.2K Ω JP0~JP15 Short : with filter Open : Without filter Default setting 2.2.2 JP16 Analog Output Channel Jumper The OME-DB-889D supports 10 separate jumper to select output channel, This feature permits up to 10 OME-DB-889D’s be co
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2.2.3 JP19 Internal / External Power selection The OME-DB-889D requires single +5V power supply. the connector CN5 are used for the external power supply connection. The OME-A-82X series multi-function card offers +5V power from the 37 pin connector , The OME-DB-889D can be directly from the PC I/O bus by connecting the OME-A-82Xseries multi-function card. JP19 From PC’s +5V Power From the CN5 input External +5V power Default Setting 2.2.4 JP18 Local / Remote Gain c
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Remote Gain Control When the JP18 is set to “R”, it means Remote Gain Control is selected and the gain is controlled by the digital signal of connector CN3 bit D4, D5, D6. The bit pattern and related gain is illustrated as: CN3 D6 D5 D4 Gain 0 0 0 0.5 0 0 1 1 0 1 0 5 0 1 1 10 1 0 0 50 1 0 1 100 1 1 0 500 1 1 1 1000 Local Gain Control Sw1 1 2 3 4 Gain ON ON ON OFF 0.5 ON ON OFF OFF 1 ON OFF ON OFF 5 ON OFF OFF OFF 10 OFF ON ON OFF 50 OFF ON OFF OFF 100 OFF OFF ON OF
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2.3 Pin Assignment The OME-DB-889D provides two 37pin D-Sub connector & two 20-pin flat cable connector. The CN1, CN2 D-sub connector is analog output link to analog input connector of OME-A-82X series multi-function card & cascaded another OME-DB-889D. The CN3, CN4 is digital control multiplex & gain setting link to digital output connector of OME-A-82x series multi-function card . CN1 , CN2 Note: CN3 , CN4 AO_n : analog output channel n A. GND :
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DOn : DO0~DO3 Multiplexer control bit. DO4~DO6 Gain control bit D. GND : Digital Ground +5V : PC’s +5V +12V PC’s +12V OME-DB-889D User’s Manual 9
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3 Analog input & Gain setting 3.1 Input Channel Selection The DB-990D provides 15 channel differential analog inputs. Input channel selection is controlled by the 4 bit TTL/CMOS digital data (CN3 DO0~DO3) issued by the OME-A-82x series multi-function card. DO 3 DO 2 DO 1 DO 0 Analog input channel 0 0 0 0 0 0 0 0 1 1 0 0 1 0 2 0 0 1 1 3 0 1 0 0 4 0 1 0 1 5 0 1 1 0 6 0 1 1 1 7 1 0 0 0 8 1 0 0 1 9 1 0 1 0 10 1 0 1 1 11 1 1 0 0 12 1 1 0 1 13 1 1 1 0 14 1 1 1 1 15 OME-
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3.2 Gain Setting The high grade instrumentation provides software programmable gains or switch selectable gain of 0.5 1, 5, 10, 50, 100, 500, 1000. Software Setting : JP18 should be place on “R” Switch Setting : JP18 should be place on “L” Software Setting Switch Setting Gain (Remote control) (Local Control) DO 6 DO 5 DO 4 SW1-3 SW1-2 SW1-1 0 0 0 ON ON ON 0.5 0 0 1 ON ON OFF 1 0 1 0 ON OFF ON 5 0 1 1 ON OFF OFF 10 1 0 0 OFF ON ON 50 1 0 1 OFF ON OFF 100 1 1 0 OFF
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3.3. The Thermocouple Input The OME-DB-889D can accept thermocouple sensor to measure temperature. The OME-DB-889D should be set to different gain value if use different thermocouple type. If you are usingOME-A-82XPGL series multi-function bard to linked OME-DB-889D you have got the gain as: Gain = OME-A-82X Gain X OME-DB-889D Gain OME-A821PGL Gain = 1 , 2 , 4 , 8 OME-DB-889D Gain = 0.5 , 1 , 5 , 10 , 50 , 100 , 1000 Examples OME-A-82XPG OME-DB Gain L Series -889D 1 X 1
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3.3.1 Voltage - TO - Temperature Conversion The temperature-versus-voltage relationship of a the thermocouple is not linear. You can reference the thermocouple reference tables to get V to T values. Or use temperature conversion equation to get V to T values. Temperature Conversion Equation: T = a0 + a1 x + a2 x^2 + a3 x^3 + a4 x^4 + …….. + an x^n where T = Temperature x = Thermocouple Voltage a = Polynomial coefficients unique to each thermocouple n = Maximum order of the po
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3.3 CJC Output The OME-DB-889D provides Cold-Junction Compensation (CJC) for the thermocouple applications. If the CJC is required, place the JP17 in the position of the channel to be used as a CJC reference. If the CJC is not required, Place the JP17 in the position “X”. CJC has output on connector CN7. Using a voltage meter measures CN7 which exists a voltage related to the OME-DB-889D board temperature. The CJC voltage transfers to temperature with formula: T( °C) = V*1000/24.4 CN
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4 Signal Connection The OME-DB-889D can multiplex up to 16 channel differential inputs. Input channel selection is controlled by a CN3 D4~ D6 digital output by OME-A-82x series multi-function card. 4.1 Floating Signal Connection The OME-DB-889D has only differential input channels, each input channel should be two signal wires. The input should be connected as: CH0HI OME-DB-889 Floating Signal Source D CH0LO A.GND Differential signal input OM
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4.2 Non-Floating Signal Source Some the signal source has one side connect to a local ground. The signal ground with OME-DB-889D ground will not be same voltage level. The input should be show as: CH0HI OME-DB-889D Common mode Signal Source CH0LO A.GND Common mode signal input OME-DB-889D User’s Manual 16
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4.3 Cascading OME-DB-889D OME-A-82X series A/D card 20 Pin Flat Cable 1. A821PGH/L 2. OME-A-822PGH/L 3. OME-A-823PGH/L OME-DB-889D #2 4. OME-A-826PGH/L 5. PCI-1800PGH/L Note: PCI-1802 should be via DB-1825 connect to OME-DB-889D OME-A-82X OME-DB-889D JP16 OME-DB-889D #3 series A/D Channel 0 OME-DB-889D #1 0 A/D Channel 1 OME-DB-889D #2 1 OME-DB-889D #n Up to 10 Boards A/D Channel 2 OME-DB-889D #3 2 A/D Channel 3 OME-DB-889D #4 3 A/D Channel n OME-DB-889D #n n A/
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4.4 Open Thermocouple Detection The OME-DB-889D provides open thermocouple detection through a resistor circuitry. These resisters are normally not connected. The user can find on the back of the board has two solder gaps for each input channel. If you short the solder gaps, the open thermocouple detection is enabled. HJ0 100M Ω -15V 1.2K Ω Channel 0 High 1uF 50V Channel 0 Low 1.2K Ω OME-DB-889 37Pin Cable GND 10K Ω LJ0 Note: If a thermoco
