Omega Speaker Systems OME-DB-889D - Manual (Page 20)

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
1.2K Ω
-15V
1uF 50V
OME-DB-889
1.2K Ω
37Pin Cable GND
Channel 0 Low
HJ0 100M Ω
10K Ω
LJ0
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 18