Omega Speaker Systems OME-DB-889D manual Open Thermocouple Detection

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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.

Channel 0 High

Channel 0 Low

HJ0 100MΩ

-15V

1.2KΩ

1uF 50V

1.2KΩ

OME-DB-889

37Pin Cable

GND

LJ0 10KΩ

Note:

If a thermocouple opens, the bias resistor will slowly pull the input voltage to -10V then user can use a simple application program to detect the voltage change.

OME-DB-889D User’s Manual

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Contents User’sGuide Servicing North America OME-DB-889D User’s Manual Features SpecificationOME-DB-889D Multiplexer Board Function Description ApplicationsFSR Installing LayoutJumper setup 1 JP0 ~ JP15 Analog Input R/C Filter3 JP19 Internal / External Power selection Local Gain Control Sw1 Pin Assignment Page Analog input & Gain setting Input Channel SelectionGain Setting Thermocouple Input Gain = OME-A-82X Gain X OME-DB-889D GainVoltage to Temperature Conversion CJC Output TC = V*1000/24.4Signal Connection Floating Signal ConnectionNon-Floating Signal Source Cascading OME-DB-889D OME-A-82X OME-DB-889DOpen Thermocouple Detection Block Diagram Using OME-A-822PGL ProgrammingExample Program DEMO01.CPage Calibration Steps CalibrationCalibration VR Description WARRANTY/DISCLAIMER Temperature
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