Open Thermocouple Detection - Omega Engineering OME-DB-889D User Manual

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
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
HJ0
1.2KΩ
1.2KΩ
37Pin Cable
LJ0
100MΩ
-15V
1uF 50V
OME-DB-889
GND
10KΩ
18